TWI705855B - Desalination treatment method of chlorine-containing powder and desalination treatment device of chlorine-containing powder - Google Patents

Abstract

When seawater is used to desalinize chlorine-containing powder such as incineration ash, it provides an efficient method for the treatment. This desalination treatment device (1) is equipped with: a first desalination washing liquid supply device (22), and an elution tank (2) for mixing chlorine-containing powder (P1) with the first desalination washing liquid ( W1) Mix and make a slurry, and dissolve chlorine; and the first solid-liquid separator (3), which separates the treated slurry (S1) in the dissolution tank (2) from solid-liquid to obtain the first The treatment of desalted cake; and the slurry transport device (4), which is used to transport the treated slurry (S1) in the dissolution tank (2) to the first solid-liquid separation device (3); and the second The washing liquid supply device (31) for desalination supplies the second washing liquid (W2) for desalination in order to wash the first desalted cake and obtain the second desalted cake; and the first liquid feeding device (5) , The first filtrate (W3) and/or the second filtrate (W4) from the first solid-liquid separator (3) are sent to the first desalination lotion supply device (22); and The first chloride ion concentration monitoring device (7) is used to monitor the chloride ion concentration of the first washing solution for desalination (W1).

Description

Desalination treatment method of chlorine-containing powder and desalination treatment device of chlorine-containing powder

The present invention relates to a desalination treatment method for chlorine-containing powder and a desalination treatment device for chlorine-containing powder, which are useful for the desalination treatment of chlorine-containing powder such as incineration ash and effective use as a cement raw material .

In the recycling process of waste caused by the raw materialization of cement, waste containing chlorine may cause problems such as clogging of cement manufacturing equipment due to its chlorine. Therefore, in order to convert chlorine-containing wastes, such as incineration ash, into raw cement, desalination is performed to reduce the chlorine content of the incineration ash before use.

Regarding the desalination treatment of incineration ash, for example, Patent Document 1 discloses a method of adding water to the incineration ash to dissolve chlorine, and then dehydrating it. In addition, for example, Patent Document 2 discloses a method of repeatedly performing mixing with water and dehydration to wash the incineration ash several times to desalinate.

However, in the methods of Patent Document 1 or Patent Document 2, a large amount of water is required for the desalination of incineration ash. Therefore, in areas where a large amount of industrial water (real water) cannot be used, or due to cost considerations, etc. However, when the use of industrial water (real water) is restricted, it is difficult to use this method.

Regarding such a problem, for example, Patent Document 3 discloses a method of using seawater when the chlorine-containing powder such as incineration fly ash is desalinated for the purpose of turning into a raw material of cement. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] JP 2002-338312 A [Patent Document 2] JP 2003-211129 A [Patent Document 3] JP 2013-166135 A

[The problem to be solved by the invention]

However, although the method of Patent Document 3 is suitable for the purpose of not using a large amount of industrial water (real water), in order to efficiently perform the desalination treatment of the chlorine-containing powder, further review is required. In addition, there is also the problem of the treatment of the effluent produced in the desalination treatment.

Therefore, the object of the present invention is to provide a desalination treatment method and a desalination treatment device that can efficiently perform the treatment without generating unnecessary discharge liquid when the chlorine-containing powder is desalinated by sea water or the like . [Means to solve the problem]

In order to achieve the above-mentioned object, the present invention, first, provides a desalination treatment method for chlorine-containing powder, which is characterized by including: a slurrying process for mixing the first desalination lotion with chlorine-containing powder and A slurry; and a chlorine elution process, in which the chlorine contained in the chlorine-containing powder is dissolved in the slurry into a liquid phase; and a desalted cake formation process, in which the chlorine is eluted from the slurry Part or all of the liquid phase is separated to obtain the first desalted cake and the first filtrate; and the desalted cake washing process is to separate the first desalted cake from the first washing liquid phase for desalination. 2 Wash with the washing liquid for desalination to obtain the second desalted cake and the second filtrate, the first filtrate obtained by the desalted cake forming process and/or the desalted cake washing process The second filtrate uses at least a part of it as the first lotion for desalination for recycling, and controls the chloride ion concentration of the first lotion for desalination, and at the same time for each supplied chlorine-containing powder The aforementioned slurrying process, the aforementioned chlorine elution process, the aforementioned desalinated cake forming process, and the aforementioned desalinated cake washing process are repeated for each of them.

According to the above-mentioned desalination treatment method of chlorine-containing powder, a slurry is prepared by first mixing the first desalination washing liquid with the chlorine-containing powder, and the chlorine contained in the chlorine-containing powder is dissolved out of the slurry In the liquid phase, part or all of the liquid phase is separated from the slurry to obtain the first desalination cake, and then the first desalination cake is used for the second desalination which is different from the first desalination washing liquid. Washing with the lotion can obtain a second desalted cake from which chlorine has been sufficiently removed. Therefore, it is useful for the raw material conversion of cement such as incineration ash containing chlorine. In addition, since the first filtrate obtained by the desalted cake forming process and/or the second filtrate obtained by the desalted cake washing process, at least a part of it is circulated as the first washing liquid for desalination Utilization. Therefore, by repeatedly performing the above-mentioned treatment for each of the supplied chlorine-containing powders, it is possible to use one chlorine-containing powder unit as the first demineralization lotion. The usage of washing water is reduced. In addition, if the first filtrate and/or the second filtrate is recycled as part or all of the first washing solution for desalination, the chloride ion concentration of the first washing solution for desalination tends to rise, but , The first lotion for desalination, even when its chloride ion concentration exceeds the chloride ion concentration of seawater, for example, it will not affect the chlorine from the chlorine-containing powder until it reaches a specific upper limit. How much influence the removal efficiency has, therefore, it becomes possible to simultaneously achieve the advantages of reducing the amount of cleaning water used and the efficiency of chlorine removal. Furthermore, since the treatment is performed while controlling the chloride ion concentration of the first washing solution for desalination, when the chloride ion concentration of the first washing solution for desalination becomes unsuitable for treatment, it can be performed at an appropriate timing. Correction at the place.

In order to achieve the above object, the second aspect of the present invention is to provide a desalination treatment method. In the desalination treatment method of the chlorine-containing powder, when the chloride ion concentration of the first desalination lotion exceeds the first threshold In the case of the value, the first washing liquid for desalination is controlled so as to satisfy the first threshold value by the new first washing liquid for desalination.

According to the above structure, if the first filtrate and/or the second filtrate are recycled as part or all of the first washing solution for desalination, the chloride ion concentration of the first washing solution for desalination will become Increasing tendency, or even exceeding a specific upper limit concentration. As a result, depending on the situation, there may be an impact on the chlorine removal efficiency, but it can prevent the chlorine removal efficiency from decreasing in advance. In this case, as the first threshold value, it may be appropriately set to a desired value based on the evaluation of trial operation and the like. More typically, for example, the chloride ion concentration of the first washing solution for desalination as a slurry between the composition and the chlorine-containing powder is 15% by mass. As long as the chloride ion concentration does not exceed 15% by mass, the system will not have much impact on the efficiency of chlorine elution from the chlorine-containing powder to the liquid phase of the slurry, that is, it will not remove the chlorine. How much impact does efficiency have. On the other hand, if the chloride ion concentration of the first washing solution for desalination exceeds 15% by mass, it may affect the chlorine removal efficiency.

In order to achieve the above-mentioned object, the present invention, thirdly, provides a desalination treatment method, which is used as the first desalination washing agent added to the aforementioned chlorine-containing powder in the above-mentioned desalination treatment method of chlorine-containing powder. The liquid uses seawater, and it is set so that the chloride ion concentration of the first washing liquid for desalination does not exceed 15% by mass.

According to the above structure, the chloride ion concentration of seawater is about 3% by mass. Therefore, even when the first lotion for desalination is mainly composed of seawater, it is easy to remove the chloride ion. The concentration is roughly maintained in the range of about 3% by mass to 15% by mass, and each supplied chlorine-containing powder can be treated at least twice or more times. Therefore, the advantage of reducing the usage of industrial water (real water) etc. can be obtained. In addition, if seawater is used as the first washing liquid for desalination, it can be inferred that the effect of seawater as a buffer solution can be found to make heavy metals such as fly ash from incineration (specifically, Pb , Zn, etc.) The elution is suppressed. According to this, the treatment cost of waste water containing heavy metals is reduced. Furthermore, if the chloride ion concentration of the first washing solution for desalination exceeds 15% by mass, depending on the situation, it may affect the chlorine removal efficiency, but it can prevent the chlorine removal efficiency from being lowered beforehand.

In order to achieve the above-mentioned object, the fourth aspect of the present invention is to provide a desalination treatment method. In the above-mentioned desalination treatment method of chlorine-containing powder, the second filtrate obtained by the desalination cake cleaning process is used. At least a part of it is recycled as the second washing liquid for desalination. While controlling the chloride ion concentration of the second washing liquid for desalination, it is used for each of the supplied chlorine-containing powders. The aforementioned slurrying process, the aforementioned chlorine elution process, the aforementioned desalted cake forming process, and the aforementioned desalted cake washing process are repeated respectively.

According to the above-mentioned structure, since the second filtrate obtained in the desalination cake washing process is recycled at least a part of it as the second desalination washing liquid, the By repeatedly performing the above-mentioned treatment for each of the chlorine-containing powders, it is possible to reduce the usage amount of the washing water used as the second washing solution for desalination for one chlorine-containing powder unit. In addition, if the second filtrate is recycled as part or all of the second washing solution for desalination, the chloride ion concentration of the second washing solution for desalination will tend to rise, and even remain in the second desalination solution. The concentration of chloride ions in the cake tends to rise, and for example, it may become difficult to use as a cement raw material in this state. However, it is because the concentration of chloride ions in the second washing solution for desalination is controlled. Therefore, when the chloride ion concentration of the second washing solution for desalination becomes unsuitable for the treatment, it can be corrected at an appropriate timing.

In order to achieve the above object, the fifth aspect of the present invention is to provide a desalination treatment method. In the fourth desalination treatment method of chlorine-containing powder, when the chloride ion concentration of the second desalination lotion exceeds and In the case of the second threshold value that is different from the aforementioned first threshold value, the aforementioned second demineralization lotion is used with a new second demineralization lotion to meet the aforementioned second threshold value. For control.

According to the above-mentioned structure, even if the second filtrate is recycled as part or all of the second washing liquid for desalination, the chloride ion concentration of the second washing liquid for desalination will tend to rise, and even The concentration of chloride ions remaining in the second desalination cake tends to rise, and for example, it may become difficult to use as a cement raw material in this state. However, it is possible to prevent the concentration of chloride ions from exceeding a specific upper limit concentration. One thing before it happens. In this case, as the second threshold value, it may be appropriately set to a desired value based on the evaluation of trial operation and the like. More typically, for example, the chloride ion concentration of the second washing solution for desalination for washing the first desalted cake is 3.5% by mass. If the chloride ion concentration is 3.5% by mass or less, the chloride ion concentration remaining in the obtained second desalted cake can be used as a cement raw material, for example. On the other hand, if the chloride ion concentration of the second washing solution for desalination exceeds 3.5% by mass, it depends on the situation. If the user wants to be a cement raw material, it will be necessary to wash with a lower chloride ion concentration. Liquid, for example, additional washing by industrial water (real water).

In order to achieve the above-mentioned object, the sixth aspect of the present invention is to provide a desalination treatment method, which, in the above-mentioned fourth or fifth desalination treatment method of chlorine-containing powder, is configured to not cause the second desalination washing The chloride ion concentration of the liquid exceeds 3.5% by mass.

According to the above configuration, as the second demineralization washing liquid for washing the first demineralized cake, it is configured so that the chloride ion concentration does not exceed 3.5% by mass. Therefore, the second demineralized cake obtained is The concentration of chloride ions remaining in the liquid phase does not exceed this concentration, so it can be used directly as a cement raw material, for example.

In order to achieve the above-mentioned object, the seventh aspect of the present invention is to provide a desalination treatment method, which, in the above-mentioned desalination treatment method of chlorine-containing powder, further includes the following processes (1) to (3). (1) Drainage recovery process, which will be recycled from the first filtrate, the second filtrate, the first desalination lotion and the second desalination lotion. One or two or more selected from the group consisting of the second washing liquid for desalination after recycling the washing liquid is not used as the first washing liquid for desalination or the second washing liquid for desalination. Those who are reused are recycled as discharged liquid; and (2) The heavy metal insolubilization process is to add a heavy metal trapping agent to the discharge liquid recovered in the aforementioned process (1), and the heavy metals contained in the discharge liquid are insoluble and turned into agglomerates; and (3) The process of forming a heavy metal agglomerated cake is to separate a part or all of the liquid phase from the agglomerated agglomerate-containing liquid containing heavy metals that are not dissolved in the aforementioned process (2), and obtain the first agglomerated cake and The third filtrate.

According to the above configuration, the discharged liquid after desalination of incineration fly ash, etc. usually contains heavy metals. However, after the discharged liquid is recovered, the heavy metal trapping agent is added. By making it insoluble into agglomerated aggregates and removing it as a metal agglomerated cake, it is possible to prevent the discharged liquid in a state containing heavy metals from being discharged outside the system. In addition, the obtained heavy metal aggregate cake can be effectively used as a cement raw material.

In order to achieve the above object, the present invention, eighth, is to provide a desalination treatment method, which is the seventh method for desalination treatment of chlorine-containing powder described above, and further includes the following process (4). (4) The heavy metal agglomerated cake washing process is to wash the first agglomerated cake with a third demineralization washing liquid that is different from the first demineralization washing liquid and the second demineralization washing liquid, and The second aggregate cake and the fourth filtrate were obtained.

According to the above configuration, by washing the first agglomerated cake obtained in the heavy metal agglomerated cake cleaning process with the third washing liquid for desalination, it is possible to obtain a second agglomerated cake with sufficient chlorine removal. Agglutination cake. Therefore, the obtained heavy metal agglomerated cake is easy to use as a cement raw material more appropriately.

In order to achieve the above object, the ninth aspect of the present invention is to provide a desalination method. In the seventh or eighth chlorine-containing powder desalination method, the heavy metal insolubilization process is to discharge The pH of the liquid is set to 7-11.

According to the above configuration, it is possible to more effectively insolubilize heavy metals.

In order to achieve the above object, the tenth aspect of the present invention is to provide a desalination treatment method, which is obtained by the above-mentioned heavy metal agglomerated cake cleaning process in the above-mentioned 8th chlorine-containing powder desalination treatment method 4 The filtrate, at least a part of it is recycled as the first washing solution for desalination.

According to the above configuration, since the fourth filtrate obtained in the heavy metal agglomerated cake cleaning process is recycled at least a part of it as the first washing liquid for desalination, it can be used as the first The amount of washing water used in the washing liquid for desalination is reduced.

In order to achieve the above-mentioned object, the present invention, eleventh, is in the tenth method for desalination of chlorine-containing powder, wherein the second filtrate obtained by the desalted cake cleaning process is at least a part of Use as the third lotion for desalination, and/or use at least a part of the fourth filtrate obtained by the heavy metal agglomerated cake cleaning process as the third lotion for desalination , While controlling the chloride ion concentration of the third washing solution for desalination, while performing the washing treatment in the heavy metal agglomerated cake washing process.

According to the above-mentioned structure, since the second filtrate obtained in the desalination cake washing process, at least a part of it is used as the third washing solution for desalination, and/or the heavy metal agglomerated cake is washed The fourth filtrate obtained in the process uses at least a part of it as the third washing liquid for desalination. Therefore, the amount of washing water used as the third washing liquid for desalination can be reduced. In addition, if the second filtrate is recycled as part or all of the second lotion for desalination, and/or the fourth filtrate is recycled as part or all of the third lotion for desalination, the The chloride ion concentration of the third washing liquid for desalination tends to rise, and even the chloride ion concentration remaining in the second aggregate cake tends to rise, and for example, the use of the cement raw material may change due to this state. However, since the treatment is performed while controlling the chloride ion concentration of the third washing solution for desalination, when the chloride ion concentration of the third washing solution for desalination becomes unsuitable for treatment, It can be corrected at the appropriate timing.

In order to achieve the above object, the present invention, twelfth, provides a desalination treatment method. In the above-mentioned eleventh chlorine-containing powder desalination treatment method, when the chloride ion concentration of the third lotion for desalination exceeds and In the case where the aforementioned first threshold value and the aforementioned second threshold value are different from the aforementioned third threshold value, the aforementioned third demineralization lotion is used with a new third demineralization lotion to satisfy the aforementioned requirements. The third threshold is used for control.

According to the above-mentioned structure, even if the second filtrate is used as part or all of the third washing liquid for desalination, and/or the fourth filtrate is used as part or all of the third washing liquid for desalination. Recycling, the chloride ion concentration of the third lotion for desalination will tend to rise, and even the chloride ion concentration remaining in the second agglomerated cake will tend to rise. For example, it will become The use of cement raw materials tends to become difficult, but it is possible to prevent the chloride ion concentration from exceeding a specific upper limit concentration. In this case, as the third threshold value, it may be appropriately set to a desired value based on the evaluation of trial operation and the like. More typically, for example, the chloride ion concentration of the third washing solution for desalination for washing the first agglomerated cake is 3.5% by mass. If the chloride ion concentration is 3.5% by mass or less, the chloride ion concentration remaining in the obtained second agglomerate cake can be used as a cement raw material, for example. On the other hand, if the chloride ion concentration of the third washing solution for desalination exceeds 3.5% by mass, it depends on the situation. If the user wants to be a cement raw material, it will be necessary to wash with a lower chloride ion concentration. Liquid, for example, additional washing by industrial water (real water).

In order to achieve the above object, the present invention, thirteenth, is to provide a desalination treatment method, which in the above-mentioned eleventh chlorine-containing powder desalination treatment method, is set to prevent the chlorine in the third desalination lotion The ion concentration exceeds 3.5% by mass.

According to the above-mentioned structure, as the third demineralization lotion for washing the first agglomerated cake, it is constructed so that the chloride ion concentration does not exceed 3.5% by mass. Therefore, the second agglomerated cake obtained The concentration of chloride ions remaining in the liquid phase does not exceed this concentration, so it can be used directly as a cement raw material, for example.

In order to achieve the above-mentioned object, the present invention, 14th, is in the above-mentioned chlorine-containing powder desalination treatment method. The chlorine-containing powder includes dust from incineration fly ash, molten fly ash and chlorine bypass dust. One or two or more selected ones.

According to the above structure, it is useful for the raw material conversion of incineration fly ash, molten fly ash, chlorine bypass dust, etc., which are wastes containing chlorine.

In order to achieve the above-mentioned object, the fifteenth aspect of the present invention is to provide a desalination treatment device for chlorine-containing powder, characterized in that it is provided with: a first desalination lotion supply device for supplying the first desalination lotion ; And an elution tank for mixing the chlorine-containing powder and the first washing liquid for desalination from the first washing liquid supply device for desalination to form a slurry, and making the chlorine-containing powder in the slurry The chlorine contained in the powder is eluted into the liquid phase; and the first solid-liquid separator is used to separate part or all of the liquid phase from the slurry after the chlorine has been eluted to obtain a first desalted cake and The treatment of the first filtrate; and the slurry conveying device for conveying the slurry processed in the dissolution tank to the first solid-liquid separation device; and the second washing liquid supply device for desalination, It is to wash the first desalination cake with a second desalination washing liquid different from the first desalination washing liquid at the first solid-liquid separation device to obtain a second desalination cake and a second filtration. Liquid treatment, and supply the second washing liquid for desalination; and the first liquid feeding device is the first desalinated cake formed by the first solid-liquid separator formed by the first The filtrate and/or the second filtrate obtained by the cleaning process of the first desalted cake performed in the first solid-liquid separator, in order to use at least a part of it as the first lotion for desalination It is used for recycling, and the liquid is sent to the aforementioned first desalination washing liquid supply device; and the first chloride ion concentration monitoring device is used to monitor the chloride ion concentration of the first desalination washing liquid.

According to the above-mentioned desalination treatment device for chlorine-containing powder, the above-mentioned desalination treatment method for chlorine-containing powder can be effectively implemented. In particular, by having the first liquid feeding device, the first filtrate obtained by the first desalted cake forming process performed in the first solid-liquid separator and/or the first filtrate obtained by the first solid-liquid separator The second filtrate obtained from the washing process of the first desalination cake at the solid-liquid separation device, at least a part of it is recycled as the first desalination lotion, and for each supplied chlorine-containing powder Each of these is repeatedly processed separately, and therefore, it is possible to reduce the amount of washing water used as the first washing solution for desalination per unit of chlorine-containing powder. In addition, if the first filtrate and/or the second filtrate are recycled as part or all of the first washing liquid for desalination, the chloride ion concentration of the first washing liquid for desalination will tend to rise. The chloride ion concentration of the first washing solution for desalination exceeds a specific upper limit concentration. It depends on the situation and may affect the removal efficiency of chlorine. However, by having the chlorine that is useful for the first washing solution for desalination The first chloride ion concentration monitoring device that monitors the ion concentration can perform calibration at an appropriate timing when the chloride ion concentration of the first washing solution for desalination becomes unsuitable for processing.

In order to achieve the above-mentioned object, the present invention, 16th, is to provide a desalination treatment device in the above-mentioned chlorine-containing powder desalination treatment device. The aforementioned chlorine-containing powder desalination treatment device is further provided with: The first desalination washing liquid supply device is used to supply a new first desalination lotion to the first desalination lotion supply device as the first desalination lotion, and the first desalination washing solution The liquid supply device is provided with: a first supply adjustment valve, which can change the supply amount of the first washing liquid for desalination to the elution tank from the first washing liquid supply device for desalination, and become The liquid can be discharged from the first washing liquid supply device for desalination, and the new first supply device for the washing liquid for desalination is provided with: a second supply adjustment valve capable of supplying the first washing liquid for desalination The supply amount of the washing liquid of the device is set to be variable, and it is configured such that when the chloride ion concentration of the first washing liquid for desalination exceeds the first threshold value, it is adjusted by adjusting the valve for the first supply Control is performed to stop or reduce the supply of the first washing liquid for desalination from the first washing liquid supply device for desalination to the elution tank, and to stop or reduce the supply of the washing liquid from the first washing liquid supply device for desalination. After part or all of the first washing liquid for desalination is drained, the second supply adjustment valve of the new supply device of the first washing liquid for desalination is controlled to control the first desalination. A washing liquid supply device is used as the first washing liquid for desalination to supply the new first washing liquid for desalination so as to satisfy the first threshold value.

According to the above configuration, the above-mentioned chlorine-containing powder desalination treatment method can be effectively implemented. In particular, it is equipped with a new supply device for the first washing liquid for desalination, and is configured based on the monitoring by the first chloride ion concentration monitoring device. When the first threshold value is exceeded, the The first threshold value is met to supply new first desalination lotion to the first desalination lotion supply device. Therefore, even if the chloride ion concentration of the first desalination lotion exceeds the specified upper limit concentration, Depending on the situation, it may affect the removal efficiency of chlorine, but it can prevent the reduction of the chlorine removal efficiency beforehand. In this case, as the first threshold value, it may be appropriately set to a desired value based on the evaluation of trial operation and the like. More typically, for example, the chloride ion concentration of the first washing solution for desalination as a slurry between the composition and the chlorine-containing powder is 15% by mass. As long as the chloride ion concentration does not exceed 15% by mass, the system will not have much impact on the efficiency of chlorine elution from the chlorine-containing powder to the liquid phase of the slurry, that is, it will not remove the chlorine. How much impact does efficiency have. On the other hand, if the chloride ion concentration of the first washing solution for desalination exceeds 15% by mass, it may affect the chlorine removal efficiency.

In order to achieve the above object, the present invention, 17th, is to provide a desalination treatment device, which is the above-mentioned desalination treatment device for chlorine-containing powder, and the aforementioned desalination treatment device for chlorine-containing powder is further provided with: 2 The liquid feeding device uses the second filtrate obtained by the washing process of the first desalted cake in the first solid-liquid separator to use at least a part of it as the second desalination The washing liquid is recycled and used for feeding the second washing liquid supply device for desalination; and the second chloride ion concentration monitoring device is used to monitor the chloride ion concentration of the second washing liquid for desalination.

According to the above configuration, the above-mentioned chlorine-containing powder desalination treatment method can be effectively implemented. In particular, with the second liquid feeding device, at least a part of the second filtrate obtained by the cleaning process of the first desalted cake in the first solid-liquid separator is used as The second washing liquid for desalination is recycled and processed repeatedly for each of the supplied chlorine-containing powders. Therefore, one chlorine-containing powder unit can be used as the second The amount of washing water used in the washing liquid for desalination is reduced. In addition, if the second filtrate is recycled as part or all of the second washing solution for desalination, the chloride ion concentration of the second washing solution for desalination will tend to rise, and even remain in the second desalination solution. The chloride ion concentration in the cake tends to rise, and for example, it may become difficult to use as a cement raw material in this state. However, by having a useful effect on the chloride ion concentration of the second desalination washing liquid The second chloride ion concentration monitoring device for monitoring can be corrected at an appropriate timing when the chloride ion concentration of the second washing solution for desalination becomes unsuitable for processing.

In order to achieve the above-mentioned object, the present invention, 18th, provides a desalination treatment device, which is the above-mentioned 17th chlorine-containing powder desalination treatment device, and the aforementioned chlorine-containing powder desalination treatment device is further provided with There are: a new second desalination lotion supply device for supplying a new second desalination lotion to the aforementioned second desalination lotion supply device as the second desalination lotion, the aforementioned second The washing liquid supply device for desalination is provided with: a third supply adjustment valve capable of setting the supply amount of the second washing liquid for the first desalination cake from the second washing liquid supply device for desalination to It is variable and can be discharged from the second washing liquid supply device for desalination. The new second supply device for the washing liquid for desalination is equipped with a fourth supply adjustment valve, which is capable of removing the liquid from the second The supply amount of the washing liquid of the washing liquid supply device for desalination is set to be variable, which is configured to: when the chloride ion concentration of the second washing liquid for desalination exceeds the second threshold which is different from the first threshold In the case of the value, the supply of the second washing liquid for desalination from the second washing liquid supply device for desalination to the first desalted cake is stopped by controlling the third supply adjustment valve Or reduce it, and after draining part or all of the second washing liquid for desalination from the second washing liquid supply device for desalination, by supplying the new second washing liquid for desalination The fourth supply adjustment valve of the device is controlled to supply the new second washing liquid as the second washing liquid for desalination to the second washing liquid supply device for desalination so as to satisfy the second threshold value. Lotion for desalination.

According to the above configuration, the above-mentioned chlorine-containing powder desalination treatment method can be effectively implemented. In particular, it is equipped with a new second supply device for the washing liquid for desalination, and is configured to monitor by the second chloride ion concentration monitoring device. When the second threshold value is exceeded, the A new second washing solution for desalination will be supplied to the second washing solution supply device for desalination by meeting the second threshold. Therefore, even if the chloride ion concentration of the second washing solution for desalination exceeds the specified upper limit concentration, Depending on the situation, it may be difficult to directly use the obtained desalted cake as a cement raw material. However, it is possible to prevent the chloride ion concentration from exceeding a specific upper limit concentration. In this case, as the second threshold value, it may be appropriately set to a desired value based on the evaluation of trial operation and the like. More typically, for example, the chloride ion concentration of the second washing solution for desalination for washing the first desalted cake is 3.5% by mass. If the chloride ion concentration is 3.5% by mass or less, the chloride ion concentration remaining in the obtained second desalted cake can be used as a cement raw material, for example. On the other hand, if the chloride ion concentration of the second washing solution for desalination exceeds 3.5% by mass, it depends on the situation. If it is to be used in cement raw materials, it will be necessary to wash with a lower chloride ion concentration. Liquid, for example, additional washing by industrial water (real water).

In order to achieve the above-mentioned object, the present invention, 19th, provides a desalination treatment device, which is the 15th or 17th chlorine-containing powder desalination treatment device, and the aforementioned chlorine-containing powder desalination treatment device is more Furthermore, it is provided with a heavy metal insolubilization reaction tank for removing from the first filtrate and the second filtrate that is not used as the first washing liquid for desalination or the second washing liquid for desalination For reused users, the first desalination lotion supplied from the first desalination lotion supply device as a drain liquid, and the second desalination lotion supply device as a drain liquid. The above-mentioned second desalination lotion for liquid delivery, one or two or more selected from the group of these, is collected and stored as a drainage liquid, and by adding a heavy metal trapping agent to it, the The heavy metals contained in the discharge liquid are not dissolved into agglomerates; and the second solid-liquid separation device is performed to remove a part of the liquid phase from the agglomerates containing the insoluble heavy metals. The process of separating all and obtaining the first agglomerated cake and the third filtrate; and the agglomerate-containing liquid conveying device for conveying the agglomerate-containing liquid that has been processed in the heavy metal insolubilization reaction tank To the aforementioned second solid-liquid separation device.

According to the above configuration, the above-mentioned chlorine-containing powder desalination treatment method can be effectively implemented. In particular, by having a heavy metal insolubilization reaction tank, although the effluent after desalination of incineration fly ash, etc. usually contains heavy metals, the effluent is recovered After that, adding a heavy metal trapping agent can make it insolubilized into an aggregate form. In addition, by providing the second solid-liquid separator, insoluble heavy metals are removed as a metal agglomerate cake, so that the discharged liquid in a state containing heavy metals can be prevented from being discharged to the outside of the system. In addition, the obtained heavy metal aggregate cake can be effectively used as a cement raw material.

In order to achieve the above-mentioned object, the 20th aspect of the present invention provides a desalination treatment device. In the 19th chlorine-containing powder desalination treatment device, the aforementioned chlorine-containing powder desalination treatment device is further provided with : The third washing liquid supply device for desalination is used to perform the third desalination at the aforementioned second solid-liquid separation device by being different from the first washing solution for desalination and the second washing solution for desalination. The third washing liquid for desalination is supplied in the manner of washing the washing liquid to obtain the second agglomerated cake and the fourth filtrate.

According to the above configuration, the above-mentioned chlorine-containing powder desalination treatment method can be effectively implemented. In particular, it is provided with a third washing liquid supply device for desalination for supplying the third washing liquid for desalination, and the first washing liquid obtained in the heavy metal agglomerated cake washing process is cleaned by the third washing liquid for desalination. The agglomerated cake is washed to obtain a second agglomerated cake from which chlorine has been sufficiently removed. Therefore, the obtained heavy metal agglomerated cake is easy to use as a cement raw material more appropriately.

In order to achieve the above-mentioned object, the present invention, 21st, provides a desalination treatment device, which is the above-mentioned 19th chlorine-containing powder desalination treatment device. The aforementioned chlorine-containing powder desalination treatment device is further provided with : The third liquid feeding device uses the fourth filtrate obtained by the washing process of the first agglomerated cake at the second solid-liquid separation device in order to make at least a part of it as the first The washing liquid for desalination is recycled, and the liquid is fed to the first washing liquid supply device for desalination.

According to the above configuration, the above-mentioned chlorine-containing powder desalination treatment method can be effectively implemented. In particular, with the third liquid feeding device, at least a part of the fourth filtrate obtained by the cleaning process of the first agglomerated cake in the second solid-liquid separator is used as Since the first washing liquid for desalination is recycled, it is possible to reduce the amount of washing water used as the first washing liquid for desalination.

In order to achieve the above-mentioned object, the present invention, 22nd, provides a desalination treatment device, which is in the above-mentioned 19th chlorine-containing powder desalination treatment device, and the aforementioned chlorine-containing powder desalination treatment device is further provided with There is: the fourth liquid feeding device is the second filtrate obtained by washing the first desalted cake in the first solid-liquid separator, in order to make at least a part of it as the first 3 Desalination washing liquid is used, and the aforementioned third desalination washing liquid supply device is used as liquid feeding; and/or the fifth liquid feeding device is used for the aforementioned second solid-liquid separation device. 1 The fourth filtrate obtained from the washing process of the desalinated cake is used for recycling at least a part of the third lotion for desalination, and the third lotion supply device for desalination is used as a liquid feed; And the third chloride ion concentration monitoring device is used to monitor the chloride ion concentration of the third washing solution for desalination.

According to the above configuration, the above-mentioned chlorine-containing powder desalination treatment method can be effectively implemented. In particular, since the second filtrate obtained in the desalination cake washing process is provided with the fourth liquid feeding device, at least a part of it is used as the third desalination lotion, and/or borrowed The fourth filtrate obtained in the heavy metal agglomerated cake cleaning process is equipped with the fifth liquid feeding device. At least a part of it is recycled as the third demineralization lotion. Therefore, it can be used as the first 3 The amount of washing water used in the washing liquid for desalination is reduced. In addition, if the second filtrate is used as part or all of the third lotion for desalination, and/or the fourth filtrate is recycled as part or all of the third lotion for desalination, the second 3 The chloride ion concentration of the washing solution for desalination tends to rise, and even the chloride ion concentration remaining in the second agglomerate cake tends to rise, and for example, the use of it as a cement raw material may become It tends to be difficult. However, by providing a third chloride ion concentration monitoring device for monitoring the chloride ion concentration of the third washing solution for desalination, when the chloride ion concentration of the third washing solution for desalination becomes unsuitable During processing, it can be corrected at an appropriate timing.

In order to achieve the above-mentioned object, the present invention, 23rd, provides a desalination treatment device, which is the above-mentioned 22nd chlorine-containing powder desalination treatment device, and the aforementioned chlorine-containing powder desalination treatment device is further provided with There are: a new third desalination lotion supply device for supplying a new third desalination lotion to the third desalination lotion supply device as the third desalination lotion. The washing liquid supply device for desalination is provided with: a fifth supply adjustment valve capable of setting the supply amount of the third washing liquid for the first desalination cake from the third washing liquid supply device for desalination to It is variable, and can be discharged from the third washing liquid supply device for desalination. The new third supply device for the washing liquid for desalination is equipped with: a sixth supply adjustment valve, which is capable of removing the liquid from the third The supply amount of the washing liquid of the washing liquid supply device for desalination is set to be variable, and it is configured such that when the chloride ion concentration of the third washing liquid for desalination exceeds the above-mentioned first threshold value and the above-mentioned second threshold value When the third threshold value is different, the third demineralization lotion from the third demineralization lotion supply device is controlled by controlling the fifth supply adjustment valve. The supply of the first desalinated cake is stopped or reduced, and after part or all of the third lotion for desalination is drained from the third lotion supply device for desalination, the new first 3 The sixth supply adjustment valve of the supply device of the washing liquid for desalination is controlled to use the third washing liquid supply device for desalination as the third lotion for desalination so as to satisfy the third threshold value. And supply the aforementioned new third washing solution for desalination.

According to the above configuration, the above-mentioned chlorine-containing powder desalination treatment method can be effectively implemented. In particular, it is equipped with a new supply device for the third washing liquid for desalination, and is configured to monitor by the third chloride ion concentration monitoring device. When the third threshold is exceeded, the The third threshold value will be met to supply a new third desalination lotion to the third desalination lotion supply device. Therefore, even if the chloride ion concentration of the third desalination lotion exceeds the specified upper limit concentration, Depending on the situation, it may be difficult to directly use the obtained heavy metal aggregate cake as a cement raw material. However, it is possible to prevent the chloride ion concentration from exceeding a specific upper limit concentration. In this case, as the third threshold value, it may be appropriately set to a desired value based on the evaluation of trial operation and the like. More typically, for example, the chloride ion concentration of the third washing solution for desalination for washing the first agglomerated cake is 3.5% by mass. If the chloride ion concentration is 3.5% by mass or less, the chloride ion concentration remaining in the obtained second agglomerate cake can be used as a cement raw material, for example. On the other hand, if the chloride ion concentration of the third washing solution for desalination exceeds 3.5% by mass, it depends on the situation. If it is to be used in cement raw materials, it will be necessary to wash with a lower chloride ion concentration. Liquid, for example, additional washing by industrial water (real water).

In order to achieve the above-mentioned object, the present invention, 24th, provides a desalination treatment apparatus, which is the above-mentioned 19th chlorine-containing powder desalination treatment apparatus, the first solid-liquid separator and the second solid-liquid separator The device uses the same device to perform the processing caused by each.

According to the above-mentioned structure, the solid-liquid separation device used can be shared, and the device structure can be simplified. [Effects of Invention]

As described above, according to the present invention, when the chlorine-containing powder is desalinated by sea water or the like, the treatment can be efficiently performed without generating unnecessary discharge liquid. Therefore, it is possible to desalinize waste such as incineration ash and use it as a cement raw material.

The object for desalination treatment of the present invention is not particularly limited as long as it is a powder containing chlorine, but examples include incineration fly ash, molten fly ash, and chlorine bypass dust. In addition, in the prior art, it is waste that is effectively used as a raw material for cement after desalination. In the typical municipal waste incineration fly ash, that is, it is generated when household waste is incinerated. In the fly ash (in this specification, it is simply referred to as "incineration fly ash"), in general, chlorine (Cl) is contained in a concentration of 10% to 30% by mass. In the fly ash generated in the melting furnace (in this specification, it is simply referred to as "melted fly ash"), in general, chlorine is contained in a concentration of 10% to 40% by mass. On the other hand, chlorine bypass dust, which is dust contained in the exhaust gas of cement kilns, is generally contained in a concentration of 10% to 40% by mass of chlorine.

According to the present invention, the chlorine concentration of the general chlorine-containing powder as described above is reduced to less than 3% by mass, more typically it is reduced to less than 2% by mass, and this can be used, for example, as a cement raw material To make effective use of. The concentration of chlorine-containing powder can be measured by well-known methods. For example, it can be ideally exemplified in ISO 29581-2 Cement-Test methods-Part2: Chemical analysis by X-ray fluorescence or Cement Association standards Test method JCAS I-05 "Quantitative method of chlorine in cement by fluorescent X-ray analysis" and other fluorescent X-ray analysis methods.

Hereinafter, in order to describe the present invention more specifically, the drawings are referred to, but the present invention is not limited to these aspects described together with the drawings.

Fig. 1 shows a flow chart representing the first embodiment of the desalination treatment method of chlorine-containing powder of the present invention.

As shown in this embodiment, the desalination treatment by the present invention is provided with: a slurrying process, which is a process of mixing chlorine-containing powder with a first desalination lotion to form a slurry; and a chlorine elution process, In the slurry, the chlorine contained in the aforementioned chlorine-containing powder is eluted into the liquid phase; and the desalted cake formation process is to separate part or all of the liquid phase from the slurry after the chlorine has been eluted And obtain the first desalination cake and the first filtrate; and the desalination cake washing process, the obtained first desalination cake is washed with the second desalination washing solution different from the aforementioned first desalination washing solution And obtain the second desalted cake and the second filtrate.

At least a part of the first filtrate obtained by the desalination cake forming process and/or the second filtrate obtained by the desalination cake washing process is recycled as the first washing solution for desalination. , And for each of the supplied chlorine-containing powders, the above-mentioned slurrying process, chlorine elution process, desalted cake forming process and desalted cake cleaning process are repeated respectively. By this, since at least a part of the first washing liquid for desalination and/or the second washing liquid for desalination that was once used is recycled, it contributes to the saving of washing water.

In addition, since the chloride ion concentration of the first demineralization lotion used repeatedly is increased with the increase of the number of repetitions, this is monitored and controlled. The so-called "monitoring" here, for example, also includes the constant monitoring of the chloride ion concentration of the first washing solution for desalination, or sampling and sampling at specific times or at arbitrary times. The significance of the determination of the concentration. In addition, the so-called "control", for example, also includes feedback control of the chloride ion concentration of the first desalination lotion so as not to exceed a specific threshold value or a predetermined time sequence Or the amount of newly added first desalination lotion, second desalination lotion, sea water, industrial water (real water), etc., so that the chloride ion concentration of the first desalination lotion does not exceed a specific threshold To make adjustments. In addition, the so-called "first lotion for desalination" that is the subject of "monitoring" or "control" is not only directly monitoring or controlling the state of the lotion that forms the slurry with the chlorine-containing powder , And the chloride ion concentration of the first desalination lotion before being added to the supplied chlorine-containing powder can be used as the object, or it can be used in a specific mixing ratio with a new lotion, etc. In the case of recycling after blending, the chloride ion concentration of the product before blending can also be targeted. That is, it is only necessary to substantially monitor and control the chloride ion concentration of the first washing solution for desalination that constitutes the slurry between the chlorine-containing powder to be supplied.

With the above configuration, it is possible to prevent the chlorine ion concentration of the first washing solution for desalination circulating in the system from excessively increasing and reducing the chlorine removal efficiency from the chlorine-containing powder. For example, when the chloride ion concentration of the first washing solution for desalination constituting the slurry exceeds a specific threshold, the chloride ion concentration of the first washing solution for desalination circulating in the system is arbitrarily used as It may be adjusted, or after the first demineralization lotion is renewed, the supplied chlorine-containing powder may be treated. As a rough standard for the number of times of recycling of the first desalination lotion circulating in the system, although the system will also vary depending on the object to be desalinated, when the object of desalination is incineration Fly ash, molten fly ash, or chlorine bypass dust, and sea water itself is used as the first washing solution for desalination for the first time of repeated treatment (sea water occupies 100%), and it is not used as the first washing solution for desalination. When there is a case where the recycled amount from the second washing liquid for desalination is used repeatedly only for the first time, it can be used twice to four times, more typically, it can be used twice to About 3 times, the treatment of the supplied chlorine-containing powder is repeated without re-adjusting the first lotion for desalination.

In Fig. 2, a flow chart showing the second embodiment of the method for desalination of chlorine-containing powder of the present invention is shown.

In this embodiment, in addition to the embodiment shown in FIG. 1, the second filtrate from the above-mentioned desalination cake washing process is further used, and at least a part of it is used as the second washing solution for desalination. For recycling. As a result, since at least a part of the second washing solution for desalination that was once used is recycled, it contributes to the saving of washing water.

In addition, since the chloride ion concentration of the second washing solution for desalination used repeatedly increases with the increase of the number of repetitions, this is monitored and controlled. The "monitoring" and "control" used here have the same meaning as in the case of the first lotion for desalination. In addition, the so-called "Second Demineralization Lotion" that is the subject of "monitoring" or "control" is not only directly monitoring or controlling the state of washing the first desalinated cake, but also in specific cooperation. In the case of recycling after blending with a new lotion etc., the chloride ion concentration of the product before blending may be targeted. That is, it is sufficient to substantially monitor and control the chloride ion concentration of the second washing liquid for desalination constituting the washing liquid for washing the first desalted cake.

With the above configuration, the chloride ion concentration of the second washing liquid for desalination circulating in the system can be increased excessively, resulting in high chloride ions in the second desalination cake obtained after washing the first desalination cake. The concentration remains and even in this state, the use as a cement raw material becomes difficult to prevent. For example, when the chloride ion concentration of the second desalination lotion used to wash the first desalination cake exceeds a specific threshold, it is only necessary to remove the chlorine in the second desalination lotion circulating in the system. The ion concentration may be adjusted arbitrarily, or the treatment may be performed on each supplied chlorine-containing powder after renewing the second washing liquid for desalination. As a rough standard for the number of times of recycling of the second washing liquid for desalination that circulates in the system, although it will vary depending on the object to be desalinated, when the object of desalination is incineration When using fly ash, molten fly ash, or chlorine bypass dust, and industrial water (real water) is used as the second washing solution for desalination, it can be performed twice to four times. More typically, it can be About 2 to 3 times, the treatment of the supplied chlorine-containing powder is repeated without re-adjusting the second washing liquid for desalination.

As the first desalination lotion used in the present invention, although water other than seawater such as industrial water (real water) can also be used, or for this, chloride ions such as NaCl, KCl, etc. may be added as needed. Concentration adjuster is chlorine-containing water that has been adjusted for the concentration of chloride ions. However, in areas where a large amount of industrial water (real water) cannot be used or due to cost considerations, the use of industrial water (real water) is somewhat different. In case of restrictions, it is convenient to use sea water. When seawater is used, as the first washing liquid for desalination, it may be configured such that seawater occupies 100% by mass, or it may be a mixed liquid of seawater and water other than seawater. In this case, as the first lotion for desalination, it is preferable to configure seawater so that seawater occupies at least 50% by mass or more, and it is more preferable to configure seawater to occupy 75% by mass or more. By using seawater as a parent body and the effect of seawater as a buffer, it is a heavy metal in the case of incineration fly ash and other chlorine-containing powders that are wastes containing heavy metals. Pb, Zn, etc. are difficult to dissolve into the liquid phase of the slurry formed by the first washing liquid for desalination, and it can contribute to the reduction of the treatment cost of the discharged water containing heavy metals. . That is, for example, it is possible to reduce the usage amount of the redox potential regulator, inorganic flocculant, polymer flocculant, etc., which are required in the insolubilization treatment of heavy metals described later.

However, as the chloride ion concentration of the first washing solution for desalination added in the first iteration of the treatment, it is preferably 2% to 5% by mass, more preferably 2% to 4% by mass, the most preferred Ideally, it is 2% by mass to 3% by mass. In particular, as the first desalination lotion added in the first iteration of the treatment, seawater itself (seawater occupies 100% by mass) can also be used. In this case, the chloride ion concentration is about 3% by mass . If the chloride ion concentration of the first washing liquid for desalination added in the first time of the repeated treatment is less than the above range, it becomes difficult to directly use seawater as the first washing liquid for desalination. In addition, if the chloride ion concentration of the first washing solution for desalination added in the first time of the repeated treatment exceeds the above range, it is impossible to obtain a sufficient number of repeated treatments, and the consumption of washing water will not be saved too much. Great help.

On the other hand, after repeated treatments, the chloride ion concentration of the first washing solution for desalination as a slurry between the composition and the chlorine-containing powder is preferably 3% to 15% by mass. More desirably, it is 3% by mass to 10% by mass, and particularly desirably, it is 3% by mass to 5% by mass. This is because if it exceeds this range, the slurry composed of the first washing solution for desalination has poor elution efficiency for the chlorine in the liquid phase, and may even impair the chlorine removal efficiency. Because of the situation.

As the second washing solution for desalination used in the present invention, it is the same as the first washing solution for desalination in that seawater or the like can also be used. However, in the case of recycling the second washing liquid for desalination, the chloride ion concentration of the second washing liquid for washing the desalinated cake during the initial repetitive treatment is preferably 3.5% by mass or less. , More preferably, the system is 3% by mass or less, and most preferably, the system is 2.5% by mass or less. In addition, the chloride ion concentration of the second washing solution for desalination as the second washing solution for washing the desalted cake after repeated treatments is the same. This is because if the chloride ion concentration exceeds the above range, the chloride ion system in the desalted cake obtained after the desalted cake washing process will remain at a high concentration, and it will not be able to be used as a cement raw material in this state. Because of the middle.

FIG. 3 shows the overall configuration diagram representing the first embodiment of the chlorine-containing powder desalination treatment apparatus of the present invention. In the desalination treatment apparatus 1 of this embodiment, the dissolution tank 2 is provided. The dissolution tank 2 contains the chlorine-containing powder P1 supplied from the chlorine-containing powder supply device 21 and the first desalination The first washing liquid W1 for desalination supplied from the washing liquid supply device 22. In the dissolution tank 2, the chlorine-containing powder P1 is mixed with the first demineralization washing liquid W1 to form a slurry, and the slurry is mixed and stirred for a specific time to make the chlorine-containing powder The chlorine contained in the body P1 dissolves in the liquid phase and dissolves out. In this embodiment, a stirring device 24 is provided in the dissolution tank 2, and by rotating the stirring blade 24a, the slurry can be mixed and stirred for a specific time. Moreover, it is equipped with the 1st solid-liquid separator 3 which solid-liquid the slurry S1 discharged|emitted from the elution tank 2 and conveyed by the slurry conveying apparatus 4 for solid-liquid separation. At the first solid-liquid separator 3, part or all of the liquid phase is separated from the slurry S1 to obtain a first desalted cake C1 and a first filtrate W3. In addition, in this embodiment, as the first solid-liquid separator, a screen pressurizer is used.

In addition, in the first solid-liquid separator 3, the obtained first desalinated cake C1 is configured to be supplied from the second desalination lotion supply device 31 with the second desalination lotion W2 Come and wash. Specifically, a valve mechanism Va is installed on the way to transport the slurry S1 processed in the elution tank 2 to the first solid-liquid separator 3, and on the other hand, the valve mechanism Va is installed in the second desalination system. On the way in which the second washing liquid W2 for desalination is circulated to the first solid-liquid separator 3 by the washing liquid supply device 31, another valve mechanism Vb is also provided to enable the slurry S1 and the second desalination The washing liquid W2 is selectively sent to the first solid-liquid separator 3, and then the slurry S1 is first sent to the first solid-liquid separator 3, and processed in the first solid-liquid separator 3 to obtain After the first desalinated cake C1, the second desalination washing liquid W2 is sent to the first solid-liquid separator 3, and by this, the first desalted cake C1 is washed to obtain the second desalted cake C2 and The second filtrate W4. In addition, in the first solid-liquid separator 3, the first filtrate W3 produced by the desalted cake forming process described above and the second filtrate W4 produced by the desalted cake cleaning process described above are Through the specific valve mechanism Vc, the first liquid feeding device 5 formed by the specific liquid feeding pump mechanism sends the liquid to the storage part of the first demineralization lotion supply device 22, and becomes capable of serving as the first 1 Washing liquid W1 for desalination is recycled. In addition, when desired, for example, when the chloride ion concentration of the first filtrate W3 becomes too high, etc., it may be configured to pass part or all of the first filtrate W3 through a specific valve mechanism Vd is sent to the discharge liquid W5 facing out of the system.

In addition, the storage part of the first washing solution supply device 22 for desalination is provided with a first chloride ion concentration monitoring device 7, and it becomes a reference to the storage part of the first washing solution supply device 22 for desalination. The chloride ion concentration of the washing liquid W1 for the first desalination is monitored. In this embodiment, as the first chloride ion concentration monitoring device 7, a chloride ion meter is used. As the first chloride ion concentration monitoring device 7, in addition to this, a general analysis method such as ion chromatography may be used for dilution water of an appropriate magnification. In addition, as the arrangement position of the first chloride ion concentration monitoring device 7, as in this embodiment, it can be arranged so that the chloride ion concentration of the content in the storage part of the first washing solution for desalination 22 can be directly measured, or It is arrange|positioned so that measurement can be performed at the position just before entering the storage part of the 1st lotion supply apparatus 22 for desalination. In addition, whatever the arrangement is, it is sufficient as long as the chloride ion concentration in the first washing liquid W1 for desalination can be estimated.

In addition, the first washing liquid supply device 22 for desalination is equipped with a first supply adjustment valve 22a formed by a specific adjusting valve mechanism, and it is possible to provide the first washing liquid supply device 22 for desalination. The contents of the storage tank as the first desalination washing liquid W1 is sent to the dissolution tank 2 or sent to the discharge liquid W5 facing out of the system is distributed by the first supply adjustment valve 22a, and it becomes The amount of liquid sent to these places can be adjusted.

Furthermore, the desalination treatment apparatus 1 of this embodiment is provided with a new first desalination washing liquid supply device 22 for supplying a new first desalination washing liquid W1a to the first desalination washing liquid supply device 22 23. When desired, it can be added as part of the first desalination lotion in the system via the second supply adjustment valve 23a formed by a specific adjustment valve mechanism, or it can be added Part or all of the first desalination lotion that has been repeatedly used multiple times is replaced. In this case, the contents of the storage part of the first washing solution supply device 22 for desalination may be configured to suitably send the amount corresponding to the amount to which the new first washing solution for desalination W1a is supplied to Towards the drain W5 outside the system.

On the other hand, the second washing liquid supply device 31 for desalination is equipped with a third supply adjustment valve 31a formed by a specific adjusting valve mechanism, and it is able to provide a good response to the second washing liquid supply device 31 for desalination. Whether the contents in the storage tank provided in the premises is sent to the first solid-liquid separator 3 as the second desalination washing liquid W2 or to the discharge liquid W5 facing out of the system is performed by the third supply adjustment valve 31a The distribution also makes it possible to adjust the amount of liquid sent to these places.

Furthermore, the desalination treatment apparatus 1 of this embodiment is provided with a new second desalination washing liquid supply device for supplying a new second desalination washing liquid W2a to the second desalination washing liquid supply device 31 32. When desired, it can be added as part of the second desalination lotion in the system via the fourth supply adjustment valve 32a formed by a specific adjustment valve mechanism, or it can be added Part or all of the second desalination lotion that has been repeatedly used multiple times is replaced. In this case, the contents of the storage part of the second washing liquid supply device 31 for desalination may be configured to suitably send the amount corresponding to the amount of the new second washing liquid for desalination W2a supplied to Towards the drain W5 outside the system.

In addition, as the state in which the contents of the storage section of the first desalination lotion supply device 22 and/or the second desalination lotion supply device 31 are discharged out of the system, it may be configured to The material S1 is sent to the path toward the dissolution tank 2 and/or the first solid-liquid separator 3 at the desired time sequence such as the time sequence for processing the material S1, and from the drain path provided in the first solid-liquid separator 3 Discharge through a specific valve mechanism Vd. In addition, the discharge liquid W5, as described later, may be configured to be discharged outside the system after the heavy metal removal treatment is applied.

In the dissolution tank 2, the chlorine-containing powder P1 and the first desalination washing liquid W1 are mixed and stirred to produce slurry S1. However, at this time, the chlorine-containing powder P1 and the first desalination washing liquid W1 The mass ratio (W1/P1) between 4-10 is ideal, 4-7 is more ideal, and 4-5 is particularly ideal. When the mass ratio (W1/P1) is smaller than 4, the elution of chlorine from the chlorine-containing powder P1 may become insufficient. Also, when the mass ratio (W1/P1) is greater than 10, the amount of drainage generated at the first solid-liquid separator 3 of the next process will increase.

As described above, the chloride ion concentration of the first washing solution W1 for desalination, which is mixed with the chlorine-containing powder P1 at the dissolution tank 2 to form the slurry S1, is preferably 3% by mass to 15% by mass. Ideally, the range is 3% by mass to 10% by mass, and particularly desirable, the range is 3% by mass to 5% by mass. In addition, in the first washing liquid W1 for desalination, since water with a higher chlorine concentration than seawater can be used, as long as it is the liquid phase chlorine discharged from the solid-liquid separation of the slurry S1 in the subsequent process If the concentration is 15% by mass or less, the liquid phase can be used as the first washing liquid W1 for desalination. Therefore, it is possible to effectively suppress the amount of water discharged from the desalination treatment of the chlorine-containing powder. On the other hand, when the chloride ion concentration of the first demineralization washing liquid W1 exceeds the above range, the amount of chlorine eluted from the chlorine-containing powder P1 is suppressed, and the efficiency of chlorine removal may be reduced. Some damage.

As described above, the lower limit of 3% by mass of the chloride ion concentration of the first washing liquid W1 for desalination is a value determined because the first washing liquid W1 for desalination uses seawater. Here, by using seawater as the matrix of the first washing liquid W1 for desalination used in the desalination of the chlorine-containing powder P1, the slurry S1 is prepared by the seawater having the effect of the carbonate-based pH buffer solution. The pH is stabilized into a weakly alkaline range of 11-12. It is conceivable that by stabilizing the pH of the slurry S1, the elution of amphoteric metal components such as Pb and Zn contained in the chlorine-containing powder P1 from the liquid phase is suppressed.

The stirring time of the slurry S1 caused by the stirring blade 24a at the dissolution tank 2 is preferably 10 minutes to 3 hours, more preferably 10 minutes to 2 hours, and more preferably 15 minutes to 1 hour . When the stirring time of the slurry S1 is shorter than 10 minutes, the elution of chlorine from the chlorine-containing powder P1 may become insufficient. Moreover, when the stirring time of the slurry S1 is longer than 3 hours, the amount of desalination treatment of the chlorine-containing powder P1 per unit time becomes smaller.

As the temperature condition for processing the slurry S1 in the dissolution tank 2, the higher the temperature, the more the amount of chlorine eluted from the chlorine-containing powder P1 will become, but it is related to the cost of processing From the standpoint of, it is more desirable that it is in the normal temperature range of 5°C to 30°C, and more preferably, it is 15 to 30°C. In this case, the dissolution tank 2 may be equipped with a specific temperature management device such as a heater.

As the slurry conveying device 4 for conveying the slurry S1 from the dissolution tank 2 to the first solid-liquid separator 3, it is sufficient to use a general-purpose slurry pump such as a screw pump or a single screw pump. .

In the first solid-liquid separator 3, the slurry S1 is separated into the first desalted cake C1 and the first filtrate W3. Here, the salt content (C _Cl (mass%)) in the separated first desalinated cake C1 can use the water content (C _W (mass%)) of the first desalted cake C1, which is The salt content (W _Cl (mass%)) of the separated first filtrate W3 and the water-insoluble salt content (C _Cl-NS (mass%)) in the first desalinated cake C1 are given by the following formula (1) To approximate it. C _Cl ≒C _W ×W _Cl ＋C _Cl-NS・・・(1) Here, the water-insoluble salt content (C _Cl-NS ) of general chlorine-containing powder P1 is 0.8% by mass to 1.2 quality%.

In addition, at the dissolution tank 2, since most of the chlorine in the chlorine-containing powder P1 is dissolved in the first filtrate W3, the slurry S1 is used as the first desalted cake C1 obtained by solid-liquid separation. It is composed of a solid phase containing almost no chlorine and a liquid phase in which chlorine is dissolved. The liquid phase contained in the first desalination cake C1 is the same as the first separated by solid-liquid separation. The filtrate W3 is the same. Therefore, the above-mentioned approximate formula (1) is established. Therefore, in order to reduce the salt content (C _Cl ) in the first desalted cake C1, it is only necessary to reduce the water content (C _W ) Just zoom out.

For the above reasons, in the first solid-liquid separator 3, a device capable of reducing the moisture content of the obtained first desalted cake C1 is used, and like this embodiment, it is particularly suitable to use a filter press Device. When the slurry S1 made of the chlorine-containing powder P1 is solid-liquid separated by a filter pressurizer, the moisture content of the first desalted cake C1 obtained is usually 50% by mass or less.

In the first solid-liquid separator 3, the first desalinated cake C1 with a water content of about 50% by mass obtained once solid-liquid separation is washed with the second washing liquid W2 for desalination, and Almost all of the liquid phase contained in the first desalination cake C1 is replaced with the second washing liquid W2 for desalination.

Specifically, for the first desalted cake C1 having a water content of about 50% by mass in the filter chamber of the first solid-liquid separator 3 (filter pressurizer), and from the side of the desalted cake constituting the filter chamber The second desalination lotion W2 supplied from the second desalination lotion supply device 31 is pressed into the filter plate, and the second desalination lotion W2 is passed through the first desalination cake C1, and then filtered from the composition The side filter plate on the other side of the chamber is discharged, and by this, the liquid phase contained in the first desalination cake C1 is replaced with the second desalination washing liquid W2, which becomes the second desalination cake C2. In addition, this washing is performed in a state where the moisture content of the desalted cake is maintained at about 50% by mass.

As mentioned above, seawater or real water can be used for the second washing liquid W2 for desalination, or when the second filtrate W4 is recycled, the second filtrate W4 is included. One of these or the mixed water of any combination of these may be sufficient. Here, by using the second demineralization lotion W2 with a chloride ion concentration of 3.5% by mass or less, the chlorine content of the obtained second demineralized cake C2 can be at least 2% by mass of the total wet mass of the cake. the following. In addition, even when real water is used in the second washing liquid W2 for desalination, since the time for the second washing liquid W2 for desalination to pass through the first desalination cake C1 in the above-mentioned washing is relatively In a very short time, unlike the above-mentioned dissolution process of dissolving from the slurry, the amphoteric metal components fixed in the solid phase of the first desalination cake C1 hardly dissolve into the liquid phase.

In the above-mentioned desalination cake washing process, the usage amount of the second desalination washing liquid W2 is preferably more than 1 times the amount of the chlorine-containing powder P1 in the first desalination cake C1, more preferably, it is 2 The amount is more than 4 times, particularly preferably, the amount is more than 4 times. When the amount of the second desalination lotion W2 used is less than 1 time the amount of the chlorine-containing powder P1, it may not be possible to remove the liquid phase in the first desalination cake C1 with a water content of about 50% by mass In the case of sufficiently replacing with the second washing liquid W2 for desalination. In addition, when the usage amount of the second washing liquid W2 for desalination exceeds 4 times the amount of the chlorine-containing powder P1, the amount of drainage generated from the desalination cake washing process will increase.

The confirmation of whether the liquid phase in the first desalination cake C1 is switched to the second desalination washing liquid W2 is to monitor the chloride ion concentration of the second filtrate W4 discharged in the desalination cake cleaning process , And confirm whether the chloride ion concentration is the same as or close to the chloride ion concentration of the second washing liquid W2 for desalination. Specifically, it is sufficient to directly analyze the second filtrate W4, or to use a general analysis method such as ion chromatography or a chloride ion meter after preparing dilution water of an appropriate magnification.

In the embodiment shown in FIG. 3, the first filtrate W3 and/or the second filtrate W4 from the first solid-liquid separator 3 is sent to the first by the first liquid feeding device 5 The storage part of the washing liquid supply device 22 for desalination can be recycled as the first washing liquid W1 for desalination. In addition, in this embodiment, the first washing liquid W1 for desalination is based on recycling, and by this, the amount of process water discharged is suppressed. In addition, in the embodiment shown in FIG. 3, the first filtrate W3 and/or the second filtrate W4 from the first solid-liquid separator 3 is sent by the first liquid feeding device 5. It reaches the storage part of the 1st washing-liquid supply apparatus 22 for desalination, but it may be comprised so that it may be directly sent to the elution tank 2 location. In addition, although the first washing liquid for desalination W1 is based on recycling, it is also possible to pass a part of it from the above-mentioned new supply device 23 for the first washing liquid for desalination through the second The new first washing solution for desalination W1a supplied to the first washing solution supply device 22 for desalination from the regulating valve 23a is supplied to reduce the chloride ion concentration and is recycled. In this case, the timing and mixing ratio of adding the new first washing solution for desalination W1a for one cycle may be appropriately set to the desired timing and mixing ratio based on the evaluation of trial operation and the like.

As described above, the first desalination lotion supply device 22 is equipped with a first supply adjustment by a specific adjustment valve mechanism that can discharge the contents of the storage part as drain liquid W5 to the outside of the system. The valve 22a, and regarding the first filtrate W3 and the second filtrate W4 from the first solid-liquid separator 3, is provided with a path through which the discharge fluid W5 is discharged to the outside of the system via a specific valve mechanism Vd . Therefore, by generating an amount corresponding to the "additional amount of the new first desalination washing liquid W1a, or the addition amount of the new second desalination washing liquid W2a added depending on the situation" As a whole, the range of the amount of the liquid W5 of the first washing liquid for desalination W1 to be recycled can be adjusted appropriately.

In addition, in the embodiment shown in FIG. 3, the control device 201 is provided to be able to receive the measurement signal from the first chloride ion concentration monitoring device 7, and based on this, the specific command signal is The first supply adjustment valve 22a provided in the first desalination washing liquid supply device 22, and the second supply adjustment valve 23a and the first liquid supply device 5 provided in the new first desalination lotion supply device 23 are provided. News. Based on this, for example, when the measured value caused by the first chloride ion concentration monitoring device 7 exceeds a specific threshold, the control device 201 sends a response to the 1 The command signal of the liquid feeding device 5 can stop the feeding of the first filtrate W3 or the second filtrate W4 caused by the operation of the first liquid feeding device 5, or by adjusting the valve for the first The command signal 22a or the second supply control valve 23a can make these control valve mechanisms perform the above-mentioned operations and perform operations such as supplying new first desalination washing liquid W1 circulating in the system. Feedback control such as control to decrease the concentration of chloride ions by liquid W1a. In addition, it may be configured to automatically determine the supply amount of the new first demineralization washing liquid W1a corresponding to the measured value by the first chloride ion concentration monitoring device 7, and it may also be configured such that the supply is The action is carried out automatically and continuously.

In addition, although it is not shown in the figure, in the embodiment shown in FIG. 3, the control device 201 can also be configured to control a specific valve mechanism and perform liquid delivery through the valve mechanism. The adjustment of the amount of liquid (or the amount of slurry), for example, can also control the valve mechanism Vc and control the feeding of the first filtrate W3 or the second filtrate W4 during the above feedback control .

In the embodiment shown in FIG. 3, the second desalted cake C2 discharged from the first solid-liquid separator 3 is transported to the cement manufacturing device by the desalted cake transport device 9. In this case, the desalted cake conveying device 9 is not particularly limited as long as it can convey cakes with a moisture content of about 50% by mass, and general-purpose devices such as conveyor belts can be used. In addition, when the place where the treatment by the desalination treatment device is carried out and the place where the cement manufacturing device is carried out is generally far away, in addition to conveying equipment such as conveyor belts, trucks can also be used. Or ships and other means of transportation.

On the other hand, in Fig. 4, an overall configuration diagram showing the second embodiment of the chlorine-containing powder desalination treatment apparatus of the present invention is shown. In the desalination treatment device 10 of this embodiment, in addition to the structure of the desalination treatment device shown in FIG. 3, it is further provided to clean the desalinated cake in the first solid-liquid separator 3 The discharged second filtrate W4 is used as the second washing liquid for desalination as a path for recycling. That is, the first filtrate W3 and/or the second filtrate W4 generated by the desalted cake forming process and/or the desalted cake washing process at the first solid-liquid separator 3 are passed through specific The valve mechanism Ve, and the first liquid feeding device 5 formed by the specific liquid feeding pump mechanism sends the liquid to the storage part of the first lotion supply device 22 for desalination, and becomes the first desalination The washing liquid W1 is used for recycling. On the other hand, the second filtrate W4 discharged in the desalted cake washing process at the first solid-liquid separator 3 passes through a specific valve mechanism Vf, and The second liquid feeding device 6 formed by a specific liquid feeding pump mechanism sends the liquid to the storage part of the second washing liquid supply device 31 for desalination, and becomes recyclable as the second washing liquid W2 for desalination . In addition, when desired, for example, when the chloride ion concentration of the second filtrate W4 becomes too high, etc., it may be configured to pass part or all of the second filtrate W4 through a specific valve mechanism Vc is sent to the discharge liquid W5 facing out of the system.

In addition, a second chloride ion concentration monitoring device 8 is installed in the storage part of the second washing liquid for desalination 31, and it is used for the second storage part of the second washing liquid supply device 31 for desalination. The chloride ion concentration of the washing liquid W2 for desalination is monitored. As the second chloride ion concentration monitoring device 8, it is sufficient to use the same thing as the above-mentioned first chloride ion concentration monitoring device 7. In the measurement of the chloride ion concentration, it can also be performed for dilution water of an appropriate magnification. Determination. For example, it is sufficient to use a general analysis method such as a chloride ion meter and ion chromatography. In this embodiment, a chloride ion meter is used. In addition, as the arrangement position of the second chloride ion concentration monitoring device 8, it can be configured to be able to directly measure the chloride ion concentration of the content in the storage part of the second demineralization lotion supply device 31, or it can also be arranged In order to be able to measure at a position just before entering the storage part of the second demineralization lotion supply device 31, that is, regardless of the arrangement, it is the same, as long as the second demineralization The chloride ion concentration at W2 can be estimated.

In the embodiment shown in FIG. 4, the second filtrate W4 from the first solid-liquid separator 3 is sent to the second demineralization lotion supply device 31 by the second liquid supply device 6 In the storage part, it can be recycled as the second washing liquid W2 for desalination. In addition, in this embodiment, the second washing liquid W2 for desalination is based on recycling, and by this, the amount of process water discharged is suppressed. In addition, although the second washing liquid W2 for desalination is based on recycling, it is also possible to use a part of it through the fourth supply device 32 of the new second washing liquid for desalination. The new first washing solution for desalination W2a supplied to the second washing solution supply device 31 for desalination from the regulating valve 32a is supplied to reduce the chloride ion concentration and is recycled. In this case, the timing and mixing ratio of adding a new second washing solution for desalination W2a for one cycle can be appropriately set to the desired timing and mixing ratio based on the evaluation of trial operation and the like.

As described above, the second washing liquid supply device 31 for desalination is equipped with a third supply adjustment by a specific adjustment valve mechanism that can discharge the contents of the storage part as drain liquid W5 to the outside of the system. The valve 31a, and regarding the first filtrate W3 and/or the second filtrate W4 from the first solid-liquid separator 3, is provided via a specific valve mechanism Vc to be discharged as a drain fluid W5 to the outside of the system The path. Therefore, by generating an amount equivalent to the "addition amount of the new second desalination washing liquid W2a, or the addition amount of the new first desalination washing liquid W1a added depending on the situation" As a whole, the range of the amount of the liquid W5 of the second washing liquid for desalination W2 to be recycled can be adjusted appropriately.

In addition, in the embodiment shown in FIG. 4, it is the same as the embodiment shown in FIG. 3, but is equipped with a control device 201, which can be compared with the above-mentioned first chloride ion concentration monitoring device 7 The feedback control is performed together with or independently of the feedback control, and the feedback control by the second chloride ion concentration monitoring device 8 is performed. That is, it is configured to be able to receive the measurement signal of the second chloride ion concentration monitoring device 8, and based on this, apply a specific command signal to the third supply adjustment valve provided in the second desalination lotion supply device 31 31a and the fourth supply adjustment valve 32a and the second liquid supply device 6 provided in the new supply device 32 of the second washing liquid for desalination are used for transmission. Based on this, for example, when the measured value caused by the second chloride ion concentration monitoring device 8 exceeds a specific threshold, the control device 201 sends a response to the 2 The command signal of the liquid feeding device 6 can stop the liquid feeding of the second filtrate W4 caused by the action of the second liquid feeding device 6, or, by adjusting the third supply adjustment valve 31a or the fourth supply The command signal of the valve 32a is capable of making these regulating valve mechanisms perform the above-mentioned actions and perform the operations such as supplying a new second washing liquid W2a for demineralization to the second washing liquid W2 for desalination circulating in the system to make chloride ions Feedback control for concentration reduction control, etc. In addition, it may be configured to automatically determine the supply amount of the new second demineralization washing liquid W2a corresponding to the measured value by the second chloride ion concentration monitoring device 8, and it may also be configured such that the supply The action is carried out automatically and continuously.

In addition, although not shown in the figure, in the embodiment shown in FIG. 4, the control device 201 can also be configured to control a specific valve mechanism and perform liquid delivery via the valve mechanism. The amount of liquid (or the amount of slurry) is adjusted by this, for example, the valve mechanism Ve can be controlled and the feeding of the first filtrate W3 or the second filtrate W4 during the above-mentioned feedback control can be controlled. For example, it is also possible to control the valve mechanism Vf and control the feeding of the second filtrate W4 during the feedback control described above.

Generally speaking, the effluent produced by desalination treatment such as incineration ash contains heavy metals such as Cr, Pb, and Zn together with the dissolved chlorine. In this state, it is difficult to meet environmental standards. Exhaust to the outside of the department under the condition of Therefore, in FIGS. 5-9, the flow chart which shows yet another embodiment of the desalination processing method of the chlorine-containing powder of this invention is shown. In these embodiments, a treatment for removing heavy metals contained in the effluent produced in the desalination treatment of the present invention is applied.

In Fig. 5, a flowchart showing the third embodiment of the method for desalination of chlorine-containing powder of the present invention is shown. In this embodiment, it is equipped with: a waste water recovery process, which is to recycle the first filtrate and the second filtrate produced by the above-mentioned desalination treatment as the first washing liquid for desalination One or more selected from the group consisting of the first lotion for desalination and the second lotion for desalination after being recycled as the second lotion for desalination is not for the first desalination The washing liquid or the aforementioned second washing liquid for desalination is recovered as the discharge liquid; and the heavy metal insolubilization process is to add a heavy metal trapping agent to the recovered discharge liquid, and the contained in the discharge liquid The heavy metal is insoluble into agglomerates; and the heavy metal agglomerated cake formation process is to separate part or all of the liquid phase from the agglomerated agglomerate containing insoluble heavy metals, and obtain a heavy metal agglomerated cake (below , Also known as "the first agglomerated cake") and the third filtrate. By this, it is possible to separate and remove the heavy metals contained in the discharge liquid generated in the desalination process of the present invention as a heavy metal aggregate cake from the liquid phase of the discharge liquid. In addition, the obtained heavy metal aggregate cake can be effectively used as a cement raw material.

Specifically, first, the above-mentioned desalination treatment is not reused as the first washing liquid for desalination or the second washing liquid for desalination, and recovered as a drain liquid, and a heavy metal trapping agent is added to this , And the heavy metals contained in the recovered effluent are not dissolved into agglomerates. As the heavy metal trapping agent, a combination of one or more types of aggregating agents such as a pH adjuster and/or an oxidation-reduction potential adjuster and an inorganic flocculant and a polymer flocculant can be cited.

In this heavy metal insolubilization process, the oxidation-reduction potential (ORP) of the above-mentioned recovered effluent is preferably set to -200mV or less, more preferably set to -450mV to -200mV. By setting the oxidation-reduction potential of the recovered effluent to -200 mV or less, even if it contains chlorine at a high concentration, the dissolved heavy metals can be efficiently insolubilized. As the oxidation-reduction potential regulator, any general-purpose agent may be used, but, for example, sodium hydrogen sulfide (sodium hydrogen sulfide) is preferable. On the other hand, inorganic flocculants or organic flocculants are used to make heavy metals that are minutely insolubilized by the adjustment of the oxidation-reduction potential in the form of agglomerated aggregates with larger diameters to be easily separated from the liquid phase. And be used. As the inorganic coagulant, ferric chloride (FeCl ₃ ), polyaluminum chloride (PAC), and the like can be cited. These can also be used in combination of two or more types. By using these ferric chloride or polyaluminum chloride as an inorganic flocculant, even if chlorine is contained in a high concentration, the minute insoluble heavy metals can be efficiently aggregated into aggregates. At this time, the amount of the inorganic flocculant to be added in the liquid phase is ideal. It is to grasp the optimal amount of addition obtained from the prior evaluation in the liquid to be processed. However, when it is difficult to perform prior evaluation, etc. , As long as it is equivalent to the molar equivalent of the same level as the addition amount of the redox potential regulator. Furthermore, the organic flocculant is used in order to increase the diameter of a small-diameter agglomerate containing heavy metals formed by the inorganic flocculant. As the polymer flocculant, any flocculant used in the solid-liquid separation in the alkaline region, such as an anionic flocculant containing polyacrylamide as the main component, may be used. At this time, the addition amount of the polymer flocculant in the liquid phase is the same as in the case of the addition amount of the above-mentioned inorganic flocculant, preferably, the optimal addition amount obtained by pre-evaluation in the treatment target liquid It is known, but when it is difficult to perform evaluation in advance, it is sufficient to add 20 ppm to 30 ppm of the recovered effluent.

In addition, in the heavy metal insolubilization process, the pH of the recovered effluent is preferably set to 7 to 11, more preferably, the pH is set to 7.5 to 10.5, and most preferably, the pH is set to 8 to 10.5 . When the pH of the recovered effluent is 7-11, the insolubilization of heavy metals can be effectively performed. Specifically, for example, when the oxidation-reduction potentials are consistent with each other, and the use amounts of the above-mentioned inorganic flocculant and polymer flocculant are also set to be the same, if the pH of the discharged liquid recovered and the amount of the discharged liquid are listed As an example of the relationship between the removal rate of Pb, the removal rate of Pb when the pH is 6 is 84.2%, and the removal rate of Pb when the pH is 12 is 98.9%. The Pb removal rate in the case of 10.5 is 99.8%, etc. In addition, as the pH adjuster used in the pH adjustment of the discharged liquid collected above, it may be a general-purpose one. For example, a general-purpose pH adjuster such as sulfuric acid or sodium hydroxide may be used.

If the typical aspect of heavy metal insolubilization process is listed, the above-mentioned recovered effluent is adjusted by the pH adjuster according to the needs, and then the redox potential adjuster is added and used as Stir and mix for 5 to 20 minutes, and set the heavy metals contained in the discharged liquid as tiny insoluble matter. After that, the inorganic flocculating agent is added and stirring and mixing is performed for 5 to 20 minutes, and the polymer flocculant is further added and stirring and mixing is performed for 5 to 20 minutes. As a result, the insolubilized heavy metals become aggregated aggregates with larger diameters. On the other hand, in the liquid phase, chlorine is dissolved at a high concentration, and aggregates containing heavy metals are in the liquid phase. Floating in and out. However, the agglomerate of such a structure contains a liquid, and is usually in the form of a slurry.

On the other hand, in the process of forming heavy metal agglomerated cakes, it is the same as that used in the desalination treatment of the chlorine-containing powder described above. A solid-liquid separation means such as a filter pressurizer is used. The agglomerate of heavy metal is contained in the liquid, and part or all of the liquid phase is separated to obtain a heavy metal agglomerated cake (first agglomerated cake) and a third filtrate.

Fig. 6 shows a flow chart representing the fourth embodiment of the desalination treatment method of chlorine-containing powder of the present invention. In this embodiment, in addition to the embodiment shown in FIG. 5, the system is further equipped with a heavy metal agglomerated cake cleaning process, and the first agglomerated cake is washed with the third demineralization washing liquid, and the washing is obtained. The cleaned heavy metal aggregate cake (hereinafter also referred to as "the second aggregate cake") and the fourth filtrate. With this, it is possible to obtain the second agglomerated cake from which chlorine has been sufficiently removed, and it is easy to use it more appropriately as a cement raw material.

Fig. 7 shows a flow chart showing the fifth embodiment of the desalination treatment method of chlorine-containing powder of the present invention. In this embodiment, in addition to the embodiment shown in FIG. 6, the fourth filtrate obtained in the heavy metal agglomerate cake cleaning process is further configured to use at least part of it as the aforementioned desalination treatment The first demineralization lotion used in, is recycled. With this, it is possible to reduce the amount of washing water used as the first washing liquid for desalination.

Fig. 8 shows a flow chart showing the sixth embodiment of the desalination treatment method of chlorine-containing powder of the present invention. In this embodiment, in addition to the embodiment shown in FIG. 6, it is further configured to use the second filtrate obtained in the desalination cake washing process in the desalination treatment described above, and at least part of it is used as The third washing solution for desalination is used for washing the heavy metal agglomerated cake, and while controlling the chloride ion concentration of the third washing solution for desalination, the washing treatment at the heavy metal agglomerate cake washing station is performed. With this, it is possible to reduce the amount of washing water used as the third washing liquid for desalination. In addition, if the second filtrate is used as part or all of the third lotion for desalination, the chloride ion concentration of the third lotion for desalination will tend to rise, and it will even remain in the second agglomerated cake. The concentration of chloride ions in the medium tends to rise, and for example, it may become difficult to use as a cement raw material in this state. However, because the chloride ion concentration of the third washing solution for desalination is controlled while controlling Therefore, when the chloride ion concentration of the third lotion for desalination becomes unsuitable for processing, it can be corrected at an appropriate timing.

Fig. 9 shows a flow chart showing the seventh embodiment of the desalination treatment method of chlorine-containing powder of the present invention. In this embodiment, in addition to the embodiment shown in FIG. 6, the fourth filtrate obtained in the heavy metal agglomerate cake cleaning process is further configured to use at least a part of it as the third desalination. The washing liquid is recycled, and while controlling the chloride ion concentration of the third desalination washing liquid, the washing treatment at the heavy metal agglomerated cake washing station is carried out. With this, it is possible to reduce the amount of washing water used as the third washing liquid for desalination. In addition, if the fourth filtrate is recycled as part or all of the third lotion for desalination, the chloride ion concentration of the third lotion for desalination will tend to rise, and it will even remain in the second agglomeration. The concentration of chloride ions in the cake tends to rise, and for example, it may become difficult to use as a cement raw material in this state. However, it is because the chloride ion concentration of the third washing solution for desalination is controlled. Therefore, when the chloride ion concentration of the third lotion for desalination becomes unsuitable for the treatment, it can be corrected at an appropriate timing.

As the third lotion for desalination used in the present invention, it is the same as the first lotion for desalination or the second lotion for desalination used in the above-mentioned desalination in the viewpoint that seawater can also be used. . However, when the third lotion for desalination is recycled, the chloride ion concentration of the third lotion for washing the desalinated cake in the first time of repeated treatments is preferably 3.5% by mass or less. , More preferably, the system is 3% by mass or less, and most preferably, the system is 2.5% by mass or less. In addition, the chloride ion concentration as the third washing solution for desalination of the washing desalination cake after repeated treatments is the same. This is because if the chloride ion concentration exceeds the above range, the chloride ion system will remain at a high concentration in the desalted cake obtained after the heavy metal agglomerated cake cleaning process, and it may not be able to be used in cement in this state. Because of the raw material.

In addition, in the same manner as in the embodiment described in FIG. 8 above, the second filtrate obtained in the desalination cake washing process in the desalination treatment described above is used as the third washing solution for desalination In this case, the chloride ion concentration of the third washing solution for desalination increases in response to the number of repetitions of recycling of the second filtrate in the desalination treatment described above, so this is monitored and controlled. In addition, as in the embodiment described with reference to Fig. 9 above, the chloride ion concentration of the third washing solution for desalination used repeatedly increases with the increase in the number of repetitions, so this is done Monitor and control. Here, "monitoring" and "control" have the same meaning as in the case of the first washing solution for desalination or the second washing solution for desalination in the above-mentioned desalination treatment. Also, the so-called "3rd Desalination Lotion" that is the subject of "monitoring" or "control" is not only directly monitoring or controlling the state of washing the first agglomerated cake, but also with specific cooperation In the case of recycling after blending with a new lotion etc., the chloride ion concentration of the product before blending may be targeted. That is, it is only necessary to substantially monitor and control the chloride ion concentration of the third washing liquid for desalination that constitutes the washing liquid for washing the first agglomerated cake.

With the above configuration, the chloride ion concentration of the third washing liquid for desalination circulating in the system can be increased excessively, resulting in high chloride ions in the second agglomerated cake obtained after washing the first agglomerated cake. The concentration remains and even in this state, the use as a cement raw material becomes difficult to prevent. For example, when the chloride ion concentration of the third demineralization lotion used to wash the first agglomerated cake exceeds a specific threshold value, the chlorine ion concentration of the third demineralization lotion circulating in the system is generally The ion concentration may be adjusted arbitrarily, or the treatment may be performed on each supplied chlorine-containing powder after the third washing solution for desalination is replaced with a new one.

Hereinafter, referring to Figs. 10 to 12, the desalination treatment method of chlorine-containing powder and the desalination treatment apparatus of chlorine-containing powder of the present invention will be further explained.

FIG. 10 shows the overall configuration diagram showing the third embodiment of the chlorine-containing powder desalination treatment apparatus of the present invention. The desalination treatment device 20 of this embodiment is equipped with a heavy metal insolubilization reaction tank 11, and is configured to be able to use the first filtrate and the second filtrate in the desalination treatment described above as the first desalination One or two or more selected from the group consisting of the first lotion for desalination after recycling with lotion and the second lotion for desalination after recycling as second lotion for desalination Among them, those that are not reused as the first washing liquid for desalination or the second washing liquid for desalination are collected and stored as drain liquid.

More specifically, in the embodiment shown in FIG. 10, when the first filtrate W3 and/or the second filtrate W4 is made from the solid-liquid separator 3 in the desalination process described above through the specific valve mechanism Vd When the drain liquid W5 is guided to the outside of the system, it can be recovered to the heavy metal insolubilization reaction tank 11 and stored. In addition, when the first desalination lotion that is no longer used from the storage portion of the first desalination lotion supply device 22 in the desalination treatment described above passes through the first supply adjustment valve 22a and furthermore, passes through a specific valve When the mechanisms Vg and Vh are used as the discharge liquid W5 to be guided to the outside of the system, they can be recovered to the heavy metal insolubilization reaction tank 11 and stored. In addition, the second desalination lotion that is no longer used from the storage part of the second desalination lotion supply device 31 in the desalination process passes through the first supply adjustment valve 31a and further passes through a specific valve When the mechanisms Vi and Vh are used as the discharge liquid W5 to be guided to the outside of the system, they can be recovered to the heavy metal insolubilization reaction tank 11 and stored. Furthermore, as described above, the contents of the storage part of the first desalination lotion supply device 22 and/or the second desalination lotion supply device 31 in the desalination process described above are discharged out of the system. In the same way, the system can also be configured to send it to the path toward the dissolution tank 2 and the solid-liquid separation device 3 at a desired time sequence such as the time sequence when the slurry S1 is not processed, and from the location of the solid-liquid separation device 3 The provided discharge path is discharged through a specific valve mechanism Vd, so this type of discharge liquid W5 can also be recovered to the heavy metal insolubilization reaction tank 11 and stored.

In addition, in this embodiment, the heavy metal insolubilization reaction tank 11 is provided with the ORP regulator supply device 111, and is configured to be able to appropriately supply the oxidation-reduction potential regulator A1 to the heavy metal insolubilization reaction tank 11. In addition, the system is provided with an inorganic flocculant supply device 112, and is configured to be able to appropriately supply the inorganic flocculant A2 to the heavy metal insolubilization reaction tank 11. In addition, the system is provided with a polymer flocculant supply device 113, and is configured to be able to appropriately supply the polymer flocculant A3 to the heavy metal insolubilization reaction tank 11. Moreover, the system is equipped with the pH adjuster supply device 114, and is comprised so that the pH adjuster A4 can be suitably supplied to the heavy metal insolubilization reaction tank 11. In addition, the heavy metal insolubilization reaction tank 11 is equipped with a stirring device 115, and by rotating the stirring blade 115a, the storage in the tank can be mixed and stirred for a specific time.

In the heavy metal insolubilization reaction tank 11, a heavy metal trapping agent such as an oxidation-reduction potential regulator, an inorganic flocculant, and a polymer flocculant is added to the above-mentioned recovered effluent. Preferably, it is generally the same as the above The redox potential adjuster, inorganic flocculant, and polymer flocculant are added sequentially, and the heavy metals in the discharged liquid are not dissolved into aggregated aggregates, and a slurry-like aggregated aggregate-containing liquid (hereinafter, Called "Slurry S2"). More specifically, at the heavy metal insolubilization reaction tank 11, it is possible to oxidize the discharged liquid W5 formed from the first filtrate W3 or the second filtrate W4 by rotating the stirring blade 115a of the stirring device 115 The reduction potential adjuster A1, the inorganic flocculant A2, the polymer flocculant A3, and the pH adjuster A4 are mixed and stirred for a specific time to form a slurry S2. In this case, the stirring time for forming slurry S2 caused by the stirring blade 115a is preferably 5 minutes to 20 minutes each time the redox potential regulator, inorganic flocculant and polymer flocculant are added. , More desirably 10 minutes to 20 minutes, still more desirably 15 minutes to 20 minutes. When the stirring time of the slurry S2 is shorter than 5 minutes, the insolubilization and aggregation of heavy metals may become insufficient in the discharged liquid collected above. Moreover, when the stirring time of the slurry S2 is longer than 20 minutes, the processing amount per unit time becomes smaller.

The temperature conditions for processing the slurry S2 at the heavy metal insolubilization reaction tank 11 are not particularly limited, but from the viewpoint of the cost related to the processing, it is preferably between 5°C and 30°C In the normal temperature region, it is more ideal that it is 15℃～30℃.

In addition, in the embodiment shown in FIG. 10, an oxidation-reduction potential monitoring device 161 is installed at the heavy metal insolubilization reaction tank 11, and is configured to respond to the above-mentioned stored in the heavy metal insolubilization reaction tank 11. The redox potential of the recovered effluent is monitored. As the oxidation-reduction potential monitoring device 161, it is sufficient to use a known measuring device. When the slurry concentration in the heavy metal insolubilization reaction tank 11 is high, it is sufficient to use a high-concentration suspension measuring device. .

Furthermore, in the embodiment shown in FIG. 10, a pH monitoring device 164 is installed at the heavy metal insolubilization reaction tank 11, and is configured to deal with the above-mentioned recovered heavy metal insolubilization reaction tank 11 The pH of the discharge liquid is monitored. As the pH monitoring device 164, it is sufficient to use a well-known measuring device, and if it can also measure the oxidation-reduction potential, it may be the same measuring device as the above-mentioned oxidation-reduction potential monitoring device 161.

In addition, in the embodiment shown in FIG. 10, the ORP regulator supply device 111 is provided with an ORP regulator supply valve 111a formed by a specific regulating valve mechanism, and it is able to respond to the ORP regulator supply device 111 The supply amount of the oxidation-reduction potential adjuster A1 supplied to the heavy metal insolubilization reaction tank 11 is adjusted. Similarly, the inorganic flocculant supply device 112 is equipped with an inorganic flocculant supply valve 112a formed by a specific regulating valve mechanism, and is capable of reacting to the insolubilization reaction of heavy metals supplied from the inorganic flocculant supply device 112. The supply amount of the inorganic flocculant A2 at the tank 11 is adjusted. The polymer flocculant supply device 113 is equipped with a polymer flocculant supply valve 113a formed by a specific regulating valve mechanism, and is able to control the high The supply amount of the polymer flocculant A3 supplied by the molecular flocculant supply device 113 to the heavy metal insolubilization reaction tank 11 is adjusted. In addition, the pH adjuster supply device 114 is equipped with a specific regulating valve mechanism. The completed pH adjuster supply valve 114a is capable of adjusting the supply amount of the pH adjuster A4 supplied from the pH adjuster supply device 114 to the heavy metal insolubilization reaction tank 11.

In the embodiment shown in FIG. 10, there is a control device 201 that can also function in common with the feedback control of the chloride ion concentration of the desalination treatment described above. The control device 201 is further used to oxidize The measurement result of the reduction potential monitoring device 161 and the measurement result of the pH monitoring device 164 are sent at any time. Upon receiving this transmission result, when the measurement value caused by the redox potential monitoring device 161 falls outside the specified management range, the ORP adjustment sent by the control device 201 based on the measurement result is adjusted The command signal of the agent supply adjustment valve 111a is capable of performing control such as supplying the oxidation-reduction potential regulator A1 to the reaction tank 11 and reducing the oxidation-reduction potential, thereby enabling feedback control. Also, in the same way, when the measured value caused by the pH monitoring device 164 falls outside the specific management range, the control device 201 sends the adjustment valve for the pH adjusting agent based on the measurement result. The command signal of 114a is capable of controlling the supply of the pH adjuster A4 to the reaction tank 11 and adjusting the pH, etc., thereby enabling feedback control.

In the embodiment shown in FIG. 10, a second solid-liquid separation for solid-liquid separation is provided for the slurry S2 discharged from the heavy metal insolubilization reaction tank 11 and transported by the slurry transport device 12装置13。 Device 13. In the second solid-liquid separator 13, part or all of the liquid phase is separated from the slurry S2 to obtain a heavy metal aggregate cake (hereinafter referred to as "first aggregate cake C3") and a third filtrate W6. In addition, as the second solid-liquid separator 13, it is possible to use a screen pressurizer or the like used as the first solid-liquid separator 3 in the desalination treatment described above. Moreover, as the slurry conveying device 12, it is sufficient to use a general-purpose slurry pump such as a screw pump or a single screw pump.

In addition, in this embodiment, the first agglomerated cake C3 discharged from the second solid-liquid separator 13 is transported to the cement manufacturing device by the heavy metal agglomerated cake transport device 15. In this case, the heavy metal agglomerated cake conveying device 15 is the same as the desalted cake conveying device 9 used in the above-mentioned desalination process. As long as it can convey cakes with a moisture content of about 50% by mass, it is combined It is not particularly limited, and general-purpose devices such as conveyor belts can be used. In addition, when the place where the treatment by the desalination treatment device is carried out and the place where the cement manufacturing device is carried out is generally far away, in addition to conveying equipment such as conveyor belts, trucks can also be used. Or ships and other means of transportation.

In Fig. 11, an overall configuration diagram showing the fourth embodiment of the chlorine-containing powder desalination treatment apparatus of the present invention is shown. In the desalination treatment apparatus 30 of this embodiment, in addition to the structure of the desalination treatment apparatus shown in FIG. 10, it is further configured to be able to pass the first agglomerated cake C3 at the second solid-liquid separator 13 The third washing liquid W7 for desalination supplied from the third washing liquid supply device 141 for desalination is used for washing. Specifically, the slurry S2 processed in the heavy metal insolubilization reaction tank 11 is transported to the second solid-liquid separator 13 on the way, a valve mechanism Vj is provided. On the other hand, On the way from the third washing liquid supply device 141 for desalination to the second solid-liquid separator 13 through the third washing liquid W3 for desalination, another valve mechanism Vk is also provided to enable the slurry S2 And the third washing liquid W7 for desalination are selectively sent to the second solid-liquid separator 13, and then the slurry S2 is first sent to the second solid-liquid separator 13 and then to the second solid-liquid separator 13 After processing to obtain the first agglomerated cake C3, the third washing liquid W3 for desalination is sent to the second solid-liquid separator 13, and by this, the first agglomerated cake C3 is washed to obtain the second Aggregate cake C4 and fourth filtrate W8. In addition, at the second solid-liquid separator 13, the third filtrate W6 produced by the above-mentioned heavy metal agglomerated cake forming process and the fourth filtrate W8 produced by the above-mentioned heavy metal agglomerated cake cleaning process , The system can be discharged to the outside of the system as a discharge liquid W9 via a specific valve mechanism V1. On the other hand, when desired, it can also be configured to send the fourth filtrate W8 generated by the heavy metal agglomerate cake cleaning process described above through a specific valve mechanism Vm, and by a specific delivery The third liquid feeding device 16 formed by the liquid pump mechanism sends the liquid to the storage portion of the first washing solution supply device 22 for desalination, and can be recycled as the first washing solution W1 for desalination.

In addition, in the embodiment shown in FIG. 11, the third supply device 141 of washing liquid for desalination is provided with a fifth supply adjustment valve 141a formed by a specific adjustment valve mechanism, and it is possible to 3 Whether the contents in the storage tank provided in the desalination washing liquid supply device 141 are sent to the second solid-liquid separator 13 as the third desalination washing liquid W7 or to the discharge liquid W9 facing out of the system by The fifth supply adjustment valve 141a is used for distribution, and it is also possible to adjust the amount of liquid sent to these places. Furthermore, the third washing liquid supply device for desalination 141 is provided with a supply of a new third washing liquid for supplying a new third washing liquid W7a to the third washing liquid supply device 141 for desalination. The device 142 can be added as part of the third demineralization lotion in the system through the sixth supply adjustment valve 142a formed by a specific adjustment valve mechanism when desired, or it can be added Part or all of the third desalination lotion that has been repeatedly used multiple times is replaced. In this case, the contents of the storage part of the third lotion supply device 141 for desalination may be configured to suitably send the amount corresponding to the amount of the new third lotion for desalination W7a to be supplied to Toward the drain W9 outside the system.

In addition, as the state of discharging the contents of the storage part of the third lotion supply device 141 for desalination out of the system, it may be configured to be at a desired timing such as a timing when the slurry S2 is not processed. It is sent to the path toward the second solid-liquid separator 13, and discharged from the drain path provided in the second solid-liquid separator 13 through a specific valve mechanism V1.

Furthermore, the embodiment shown in FIG. 11 is provided with feedback control of the chloride ion concentration that can also be used in the desalination treatment described above, and furthermore, is common to the feedback control in the embodiment described in FIG. 10 The functioning control device 201, at the control device 201, becomes the measurement signal received from the first chloride ion concentration monitoring device 7, and based on this, the third liquid feeding device 16 Send news. Based on this, for example, when the measured value caused by the first chloride ion concentration monitoring device 7 exceeds a specific threshold, the control device 201 sends a response to the The command signal of the 3 liquid feeding device 16 can stop the feeding of the fourth filtrate W8 caused by the action of the third liquid feeding device 16, or by adjusting the first supply adjustment valve 22a or the second supply adjustment The command signal of the valve 23a is capable of making these regulating valve mechanisms perform the above-mentioned actions and perform, for example, supplying a new first demineralization washing liquid W1a to the first demineralization washing liquid W1 circulating in the system to make chloride ions Feedback control for concentration reduction control, etc. In addition, it may be configured to automatically determine the supply amount of the new first demineralization washing liquid W1a corresponding to the measured value by the first chloride ion concentration monitoring device 7, and it may also be configured such that the supply is The action is carried out automatically and continuously.

In addition, although it is not shown in the figure, in the embodiment shown in FIG. 11, the control device 201 may also be configured to control the valve mechanism and perform the amount of liquid delivered through the valve mechanism. (Or the amount of slurry), by this, for example, the valve mechanism Vm can be controlled and the feeding of the fourth filtrate W8 during the feedback control described above can be controlled.

Fig. 12 shows the overall configuration diagram of the fifth embodiment of the chlorine-containing powder desalination treatment apparatus of the present invention. In the desalination treatment device 40 of this embodiment, in addition to the structure of the desalination treatment device shown in FIG. 11, a second step produced by the desalination cake washing process in the desalination treatment described above is further provided. 2 The path through which the filtrate W4 is sent to the storage part of the third demineralization lotion supply device 141 by the fourth liquid supply device 17 formed by the specific liquid supply pump mechanism through the specific valve mechanism Vn, And it can be used as the third washing liquid W7 for desalination. Furthermore, it is provided that the fourth filtrate W8 generated by the heavy metal agglomerated cake cleaning process described above is passed through a specific valve mechanism Vo and a fifth liquid feeding device 18 formed by a specific liquid feeding pump mechanism is provided. The liquid is sent to the path of the storage part of the third washing liquid supply device 141 for desalination, so that it can be recycled as the third washing liquid W7 for desalination.

In the embodiment shown in FIG. 12, the storage part of the third washing liquid supply device 141 for desalination is provided with a third chloride ion concentration monitoring device 19, and it becomes a The chloride ion concentration of the third washing liquid W7 for desalination in the storage part of the supply device 141 is monitored. As the third chloride ion concentration monitoring device 19, it is sufficient to use the same as the above-mentioned first chloride ion concentration monitoring device 7 and second chloride ion concentration monitoring device 8. In the measurement of the chloride ion concentration, it may be used. Measure against the dilution water of the appropriate magnification. For example, it is sufficient to use a general analysis method such as a chloride ion meter and ion chromatography. In this embodiment, a chloride ion meter is used. In addition, as the arrangement position of the third chloride ion concentration monitoring device 19, it can be configured to be able to directly measure the chloride ion concentration of the content in the storage part of the third lotion supply device 141 for desalination, or it can also be arranged In order to be able to measure at a position just before entering the storage part of the third washing liquid supply device 141 for desalination, that is, regardless of the arrangement, it is the same as long as it can be used for the third washing liquid for desalination. The chloride ion concentration at W7 can be estimated.

Furthermore, the embodiment shown in FIG. 12 is provided with feedback control of the chloride ion concentration that can also be used in the desalination treatment described above, and further, the feedback control in the embodiment described in FIGS. 10 and 11 above Control the control device 201 that functions in common. In the control device 201, the measurement signal from the third chloride ion concentration monitoring device 19 is further received. Based on this, the fourth liquid feeder The device 17 and the fifth liquid feeding device 18 are used for transmission. Based on this, for example, when the measured value by the third chloride ion concentration monitoring device 19 exceeds a specific threshold value, the control device 201 sends a response to the 4 The command signal of the liquid feeding device 17 and/or the fifth liquid feeding device 18 can stop the feeding of the second filtrate W4 caused by the action of the fourth liquid feeding device 17, or the fifth liquid feeding device 18 The feeding of the fourth filtrate W8 is stopped due to the operation, or the command signal to the fifth supply adjustment valve 141a or the sixth supply adjustment valve 142a can make these adjustment valve mechanisms perform the above-mentioned It operates and performs feedback control such as control to decrease the chloride ion concentration by supplying a new third washing liquid W7a to the third washing liquid W7 for desalination circulating in the system. In addition, it may be configured to automatically determine the supply amount of the new third demineralization lotion W7a corresponding to the measured value by the third chloride ion concentration monitoring device 19, and it may also be configured such that the supply is The action is carried out automatically and continuously.

In addition, although it is not shown in the figure, in the embodiment shown in FIG. 12, the control device 201 can also be configured to control a specific valve mechanism and perform liquid delivery through the valve mechanism. The adjustment of the amount of liquid (or the amount of slurry), for example, can also control the valve mechanism Vn and control the feeding of the second filtrate W4 during the feedback control described above. In addition, it may be configured to control the valve mechanism Vo and control the feeding of the fourth filtrate W8 during the above-mentioned feedback control.

As explained above, with the technology provided by the present invention, for example, it is also possible to construct a cement raw material supply system for turning incineration fly ash, molten fly ash, chlorine bypass dust, etc. into cement raw materials. Here, in FIG. 13, the structure of the desalination treatment device for chlorine-containing powder shown in the above-mentioned FIG. 12 is followed to show the desalination treatment method and the treatment method for chlorine-containing powder provided by the present invention. The desalination treatment device for chlorine powder is a flow chart showing the overall structure further illustratively. However, when constructing the present invention, of course, a part of the configuration shown in FIG. 13 can be appropriately omitted within the scope described above. In addition, the first solid-liquid separation device and the second solid-liquid separation device may also be configured to perform processing by each of the same devices. In FIG. 14, the desalination treatment device 50 in which the first solid-liquid separator and the second solid-liquid separator are the same device is shown. In addition, in FIG. 15, a flow chart of the overall configuration related to this embodiment is shown. Here, the structures, functions, and the like represented by the explanatory labels and component symbols in the drawings of FIGS. 14 and 15 are the same as those in FIGS. 10 to 13 described above. According to this aspect, the solid-liquid separation device used can be used in common and the device configuration can be simplified. [Example]

Hereinafter, in order to further describe the present invention in detail, specific test examples are shown, but the present invention is not limited to the aspects of these test examples.

As the chlorine-containing powder P1, molten fly ash generated from a gasification melting furnace was used. In Table 1, its chemical composition is shown.

As the first washing liquid W1 for desalination to be mixed with the molten fly ash P1 to form a slurry, water with different salt concentrations in each level shown in Table 2 was prepared.

As the second demineralization washing liquid W2 for washing the first demineralized cake, water with different salt concentrations at each level shown in Table 3 was prepared.

In the treatment of molten fly ash P1 caused by the configuration of the chlorine-containing powder desalination treatment device 1 shown in FIG. 3, how does the salt concentration of each washing liquid affect the treatment of molten fly ash P1? , Using molten fly ash of level A shown in Table 1, and combining the first desalination lotion W1 with the salt concentration of each level shown in Table 2 and the level shown in Table 3 The second desalination washing liquid W2 of the salt concentration was used in the combination shown in Table 4, and the molten fly ash P1 was processed for evaluation. In addition, in all combinations, the solid-to-liquid ratio of slurry S1 (the mass ratio of "the first washing liquid for desalination W1/melting fly ash P1") is 4, and the slurry S1 is stirred by a stirring device 24 The rotation speed of the stirring blade 24a is 400 rpm and stirring is performed for 30 minutes. The moisture content of the first desalted cake C1 and the second desalted cake C2 obtained by the treatment in the first solid-liquid separator 3 are both 50% by mass, the solid-to-liquid ratio of the second desalinated cake C2 (the mass ratio of "the second desalination lotion W2 / molten fly ash P1") at the time of washing by the second desalination lotion W2 is 1. Under these conditions, the molten fly ash P1 was processed. In addition, as the first solid-liquid separator 3, a screen pressurizer was used.

After the slurry S1 was stirred for 30 minutes, the Cl concentration, Pb concentration, and Zn concentration of the first filtrate W3 obtained by solid-liquid separation of the liquid phase from the first desalination washing liquid W1 The measurement was conducted in accordance with JIS K 0102 "Factory Drainage Test Method". Specifically, the Cl concentration used the potentiometric titration method, and the Pb concentration and the Zn concentration used the ICP mass spectrometry method (apparatus used: Agilent 7900 ICP-MS (trade name) manufactured by Agilent Technologies). In addition, the chlorine content of the second demineralized cake C2 after washing caused by the second washing liquid W2 for desalination was determined by using the potentiometric titration method after the sample was decomposed by nitric acid and hydrogen peroxide.了定。 The determination. The results are shown in Table 5.

As can be seen from Table 5, in Test Examples 1-1 to 8, the Cl concentration of the second desalted cake C2 after washing by the second washing liquid W2 for desalination was 2.0% by mass or less. In addition, in the test examples 1-1 to 4 in which the molten fly ash P1 and the first demineralization washing liquid W1 with a chlorine concentration of 3% by mass or 5% by mass were mixed to form a slurry and processed, the After slurry S1 was stirred for 30 minutes, the Pb concentration and Zn concentration of the first filtrate W3 obtained by solid-liquid separation from the liquid phase of the first desalination washing liquid W1 were as low as 1 ppm. Value. On the other hand, in Test Example 1-9 and Test Example 1-10 in which the molten fly ash P1 and the real water as the first washing liquid W1 for desalination were mixed to form a slurry and processed, the slurry S1 After stirring for 30 minutes, the Pb concentration and Zn concentration of the first filtrate W3 obtained by solid-liquid separation of the liquid phase derived from the first desalination washing liquid W1 exhibited relatively high values. In addition, the molten fly ash P1 and the high chlorine concentration water with a chlorine concentration of 18% by mass as the first washing liquid W1 for desalination were mixed to form a slurry and processed in Test Example 1-11 and Test Example 1- In 12, the fusion system of chlorine from the molten fly ash P1 for the high chlorine concentration water is not sufficient, and the Cl concentration of the second desalted cake C2 cannot be sufficiently reduced.

Next, in the treatment of the discharge liquid W5 facing out of the system due to the configuration of the chlorine-containing powder desalination treatment device 20 shown in FIG. 10, how the pH of the discharge liquid W5 will affect the treatment One thing was evaluated. Specifically, molten fly ash of level B shown in Table 1 was used, and the same treatment as level 2-b of Table 4 above was performed (first desalination washing liquid W1: seawater, second desalination Washing liquid W2: seawater) to obtain a mixed liquid of the first filtrate W3 and the second filtrate W4, and for this, add a pH adjuster to make 5 different pH-oriented discharge liquid W5 outside the system , To add ORP modifier (NaSH) so that the oxidation-reduction potential will be -200mV and stir for 15 minutes, and then add an amount of inorganic agglomeration equivalent to the same molar equivalent as the amount of ORP modifier added (FeCl ₃ ) and stirred for 15 minutes. After that, 30 ppm of a polymer flocculant (DIAFLOC, manufactured by Mitsubishi Chemical Corporation) was added. The treated drain liquid obtained in this way was subjected to solid-liquid separation by suction filtration to obtain a system drain liquid W9 (corresponding to the third filtrate W6) of each pH value. In Table 6, the heavy metal content of the discharge liquid W5 (reference example) facing out of the system before pH adjustment and the outer discharge liquid W9 of each pH value (equivalent to the third filtrate W6) are shown. In addition, in Table 6, the standard value liquid for uniform drainage in Japan is described as a reference.

As can be seen from Table 6, in Test Example 2-1 where the pH was adjusted to 9 and Test Example 2-2 where the pH was adjusted to 10.5, all the heavy metals evaluated were Meet the value of Japan's uniform drainage standard. On the other hand, in Test Examples 2-3 and 4 in which the pH was adjusted to the more acidic side and Test Example 2-5 in which the pH was adjusted to the alkaline side in the same manner as in the reference example, the Pb system in particular fell within the uniform drainage standard outer. In this way, it is obvious that in the case of the desalination treatment method of chlorine-containing powder and the desalination treatment device of chlorine-containing powder of the present invention and the treatment of removing heavy metals from the discharged liquid, the By adjusting the pH when the heavy metal aggregate cake is formed, it is possible to more fully suppress the elution of heavy metals from the drainage.

1, 10, 20, 30, 40, 50‧‧‧Desalination device for chlorine-containing powder 2‧‧‧Dissolution tank 3‧‧‧The first solid-liquid separation device 4. 12‧‧‧Pulpant conveying device 5‧‧‧The first liquid feeding device (pump mechanism) 6‧‧‧Second liquid feeding device (pump mechanism) 7‧‧‧The first chloride ion concentration monitoring device 8‧‧‧The second chloride ion concentration monitoring device 9‧‧‧Desalted cake conveying device 11‧‧‧Heavy metal insoluble reaction tank 15‧‧‧Heavy metal agglomerated cake conveying device 16‧‧‧The third liquid feeding device (pump mechanism) 17‧‧‧The fourth liquid feeding device (pump mechanism) 18‧‧‧The fifth liquid delivery device (pump mechanism) 19‧‧‧The third chloride ion concentration monitoring device 21‧‧‧Chlorine powder supply device 22‧‧‧The first lotion supply device for desalination 22a‧‧‧First supply adjustment valve (adjustment valve mechanism) 23‧‧‧New first desalination lotion supply device 23a‧‧‧Second supply adjustment valve (adjustment valve mechanism) 24、115‧‧‧Stirring device 24a、115a‧‧‧Mixing Wing 31‧‧‧Second Desalination Washing Liquid Supply Device 31a‧‧‧The third supply adjustment valve (adjustment valve mechanism) 32‧‧‧New second desalination lotion supply device 32a‧‧‧4th supply adjustment valve (adjustment valve mechanism) 111‧‧‧ORP regulator supply device 111a‧‧‧ORP regulator supply regulating valve 112‧‧‧Inorganic coagulant supply device 112a‧‧‧Inorganic coagulant supply adjustment valve 113‧‧‧High polymer flocculant supply device 113a‧‧‧High polymer flocculant supply adjustment valve 114‧‧‧pH adjuster supply device 114a‧‧‧pH adjuster supply adjustment valve 141‧‧‧The 3rd Desalination Lotion Supply Device 141a‧‧‧Fifth supply adjustment valve (adjustment valve mechanism) 142‧‧‧New first desalination lotion supply device 142a‧‧‧Sixth supply adjustment valve (adjustment valve mechanism) 201‧‧‧Control device Va～Vo‧‧‧Valve mechanism P1‧‧‧Chlorine powder S1、S2‧‧‧Slurry C1‧‧‧The first desalted cake C2‧‧‧Second Desalted Cake C3‧‧‧First agglutination cake C4‧‧‧Second Agglutination Cake W1‧‧‧The first lotion for desalination W1a‧‧‧New first desalination lotion W2‧‧‧Second Desalination Lotion W2a‧‧‧New second desalination lotion W3‧‧‧The first filtrate W4‧‧‧Second filtrate W5‧‧‧Drain fluid facing out of the system W6‧‧‧The third filtrate W7‧‧‧The third lotion for desalination W7a‧‧‧New 3rd Desalination Lotion W8‧‧‧The fourth filtrate W9‧‧‧External discharge liquid

[Fig. 1] is a flowchart showing the first embodiment of the desalination treatment method of chlorine-containing powder of the present invention. [Fig. 2] is a flowchart showing the second embodiment of the method for desalination of chlorine-containing powder of the present invention. [Fig. 3] is an overall configuration diagram showing the first embodiment of the chlorine-containing powder desalination treatment device of the present invention. Fig. 4 is an overall configuration diagram showing the second embodiment of the chlorine-containing powder desalination treatment device of the present invention. [Fig. 5] is a flowchart showing the third embodiment of the desalination treatment method of chlorine-containing powder of the present invention. Fig. 6 is a flow chart showing the fourth embodiment of the desalination treatment method of chlorine-containing powder of the present invention. Fig. 7 is a flow chart showing the fifth embodiment of the desalination treatment method of chlorine-containing powder of the present invention. Fig. 8 is a flow chart showing the sixth embodiment of the desalination treatment method of chlorine-containing powder of the present invention. Fig. 9 is a flow chart showing the seventh embodiment of the desalination treatment method for chlorine-containing powder of the present invention. [Fig. 10] is an overall configuration diagram showing the third embodiment of the chlorine-containing powder desalination treatment device of the present invention. [Fig. 11] is an overall configuration diagram showing the fourth embodiment of the chlorine-containing powder desalination treatment device of the present invention. [Fig. 12] is an overall configuration diagram showing the fifth embodiment of the chlorine-containing powder desalination treatment apparatus of the present invention. [Fig. 13] is a flow chart of the overall configuration that further illustrates the desalination treatment method of chlorine-containing powder and the desalination treatment device of chlorine-containing powder of the present invention. Fig. 14 is an overall configuration diagram for the case where the first solid-liquid separator and the second solid-liquid separator are the same device in the chlorine-containing powder desalination treatment device of the present invention. [FIG. 15] This is for when the first solid-liquid separator and the second solid-liquid separator are the same device in the chlorine-containing powder desalination treatment method and the chlorine-containing powder desalination treatment device of the present invention Circumstances and further illustrate the overall composition flow chart.

1. Desalination device for chlorine-containing powder

2‧‧‧Dissolution tank

3‧‧‧The first solid-liquid separation device

4‧‧‧Slurry conveying device

5‧‧‧The first liquid feeding device (pump mechanism)

7‧‧‧The first chloride ion concentration monitoring device

9‧‧‧Desalted cake conveying device

21‧‧‧Chlorine powder supply device

22‧‧‧The first lotion supply device for desalination

22a‧‧‧First supply adjustment valve (adjustment valve mechanism)

23‧‧‧New first desalination lotion supply device

23a‧‧‧Second supply adjustment valve (adjustment valve mechanism)

24‧‧‧Stirring device

24a‧‧‧Mixing Wing

31‧‧‧Second Desalination Washing Liquid Supply Device

31a‧‧‧The third supply adjustment valve (adjustment valve mechanism)

32‧‧‧New second desalination lotion supply device

32a‧‧‧4th supply adjustment valve (adjustment valve mechanism)

201‧‧‧Control device

Va, Vb, Vc, Vd‧‧‧Valve mechanism

P1‧‧‧Chlorine powder

S1‧‧‧Slurry

C1‧‧‧The first desalted cake

C2‧‧‧Second Desalted Cake

W1‧‧‧The first lotion for desalination

W1a‧‧‧New first desalination lotion

W2‧‧‧Second Desalination Lotion

W2a‧‧‧New second desalination lotion

W3‧‧‧The first filtrate

W4‧‧‧Second filtrate

W5‧‧‧Drain fluid facing out of the system

Claims (24)

A desalination treatment method for chlorine-containing powder, characterized in that it is equipped with: a slurrying process for mixing the first desalination lotion with chlorine-containing powder to form a slurry; and a chlorine elution process for the slurry In the material, the chlorine contained in the chlorine-containing powder is dissolved into the liquid phase; and the desalted cake forming process is to separate part or all of the liquid phase from the slurry after the chlorine is dissolved to obtain the first Desalted cake and the first filtrate; and the desalted cake washing process, the first desalted cake is washed with a second desalination washing liquid that is different from the first desalination washing liquid to obtain a second desalted cake And the second filtrate, the first filtrate obtained by the desalted cake forming process and/or the second filtrate obtained by the desalted cake washing process, at least a part thereof is used as the first filtrate 1 The washing solution for desalination is recycled, and while monitoring and controlling the chloride ion concentration of the first washing solution for desalination, the slurry is repeatedly performed for each of the supplied chlorine-containing powders. Chemical engineering and the aforementioned chlorine elution process, the aforementioned desalinated cake formation process, and the aforementioned desalinated cake washing process. Such as the desalination treatment method of chlorine-containing powder described in item 1 of the scope of patent application, wherein: When the chloride ion concentration of the first lotion for desalination exceeds the first threshold, the first lotion for desalination is replaced by a new first lotion for desalination to meet the requirements of the first Threshold value method for control. The desalination treatment method of chlorine-containing powder as described in the first item of the scope of patent application, wherein, as the first washing liquid for desalination added to the aforementioned chlorine-containing powder, seawater is used, and it is not The chloride ion concentration of the first washing solution for desalination exceeds 15% by mass. The method of desalination treatment of chlorine-containing powder as described in the first item of the scope of patent application, wherein the second filtrate obtained by the desalted cake cleaning process is used for the second desalination. The washing liquid is recycled. While monitoring and controlling the chloride ion concentration of the second washing liquid for desalination, the slurrying process and the aforementioned slurrying process and the foregoing are repeated for each of the supplied chlorine-containing powders. The chlorine elution process and the aforementioned desalinated cake forming process and the aforementioned desalinated cake washing process. The method for desalination of chlorine-containing powder as described in item 4 of the scope of patent application, wherein when the chloride ion concentration of the second desalination lotion exceeds the second threshold which is different from the first threshold In the case of the above-mentioned second desalination lotion, the new second desalination lotion will meet the aforementioned second threshold Way to control. For example, the method for desalination of chlorine-containing powders as described in item 4 or item 5 of the scope of patent application, wherein the chloride ion concentration of the second lotion for desalination does not exceed 3.5% by mass. For example, the desalination treatment method of chlorine-containing powder described in item 1 of the scope of patent application, which is further equipped with the following projects (1) to (3): (1) Wastewater recovery project, which will The first filtrate, the second filtrate, the first desalination lotion that is recycled as the first desalination lotion, and the second desalination that is recycled as the second desalination lotion One or two or more selected from the group of washing liquids that are not reused as the first washing liquid for desalination or the second washing liquid for desalination shall be recovered as a discharged liquid; and ( 2) The heavy metal insolubilization process is to add a heavy metal trapping agent to the discharge liquid recovered in the aforementioned process (1), and the heavy metals contained in the discharge liquid are not dissolved into agglomerates; and ( 3) The process of forming a heavy metal agglomerated cake is to separate a part or all of the liquid phase from the agglomerated liquid containing heavy metals that are not dissolved in the aforementioned process (2), and obtain the first agglomerated cake and the second 3 Filtrate. Desalination of chlorine-containing powder as described in item 7 of the scope of patent application A method, wherein the process is further provided with the following (4) process: (4) The heavy metal agglomerated cake cleaning process is to combine the first agglomerated cake with the first washing solution for desalination and the second desalination Wash it with the third desalination washing liquid different from the washing liquid phase, and obtain the second agglomerated cake and the fourth filtrate. For example, the desalination treatment method of chlorine-containing powder described in item 7 or item 8 of the scope of patent application, wherein the heavy metal insolubilization process is to set the pH of the discharge liquid to 7-11. The method for desalination of chlorine-containing powder as described in item 8 of the scope of patent application, wherein the fourth filtrate obtained by the heavy metal agglomerated cake cleaning process is at least partly used as the first desalination Use lotion for recycling. The method for desalination of chlorine-containing powder as described in item 10 of the scope of patent application, wherein the second filtrate obtained by the desalted cake cleaning process is used as the third desalination Use the washing liquid, and/or the fourth filtrate obtained by the heavy metal agglomerated cake washing process, at least part of which is used as the third washing liquid for desalination, While monitoring and controlling the chloride ion concentration of the third washing solution for desalination, the washing process in the heavy metal agglomerate cake washing process is performed. As described in item 11 of the scope of patent application, the chlorine-containing powder desalination treatment method, wherein, when the chloride ion concentration of the aforementioned third desalination lotion exceeds the aforementioned first threshold value and the aforementioned second threshold value When the third threshold is different, the aforementioned third lotion for desalination is controlled by a new third lotion for desalination so as to satisfy the aforementioned third threshold. The method for desalination of chlorine-containing powders as described in item 11 of the scope of the patent application, wherein the chlorine ion concentration of the third lotion for desalination does not exceed 3.5% by mass. For example, the desalination treatment method of chlorine-containing powder as described in item 1 or item 7 of the scope of patent application, wherein the aforementioned chlorine-containing powder contains the dust from incineration fly ash, molten fly ash and chlorine bypass dust One or two or more selected ones. A desalination treatment device for chlorine-containing powder, characterized in that it is equipped with: a first desalination washing liquid supply device for supplying the first desalination washing liquid And an elution tank for mixing the chlorine-containing powder and the first washing liquid for desalination from the first washing liquid supply device for desalination to form a slurry, and making the chlorine-containing powder in the slurry The chlorine contained in the powder is eluted into the liquid phase; and the first solid-liquid separator is used to separate part or all of the liquid phase from the slurry after the chlorine has been eluted to obtain a first desalted cake and The treatment of the first filtrate; and the slurry conveying device for conveying the slurry processed in the dissolution tank to the first solid-liquid separation device; and the second washing liquid supply device for desalination, It is to wash the first desalination cake with a second desalination washing liquid different from the first desalination washing liquid at the first solid-liquid separation device to obtain a second desalination cake and a second filtration. Liquid treatment, and supply the second washing liquid for desalination; and the first liquid feeding device is the first desalination cake formed by the first solid-liquid separator formed by the first The filtrate and/or the second filtrate obtained by the cleaning process of the first desalted cake performed in the first solid-liquid separator, in order to use at least a part of it as the first lotion for desalination It is used for recycling, and the liquid is sent to the aforementioned first desalination washing liquid supply device; and the first chloride ion concentration monitoring device is used to monitor the chloride ion concentration of the first desalination washing liquid. Desalination of chlorine-containing powder as described in item 15 of the scope of patent application An apparatus, wherein the desalination treatment device for the chlorine-containing powder is further provided with: a new first desalination washing liquid supply device for the first desalination lotion supply device as the first The first washing liquid for desalination is supplied with the washing liquid for desalination, and the first washing liquid supply device for desalination is provided with: a first supply adjustment valve that can be used from the first washing liquid supply device for desalination The supply amount of the first washing liquid for desalination in the elution tank is set to be variable, and the liquid can be discharged from the first washing liquid supply device for desalination. The new first washing liquid supply device for desalination is Equipped with: a second supply adjustment valve capable of changing the supply amount of the washing liquid to the first washing liquid supply device for desalination, and is configured such that the chloride ion concentration of the first washing liquid for desalination When the first threshold value is exceeded, the elution of the first lotion for desalination from the first desalination lotion supply device is controlled by controlling the first supply adjustment valve. The supply of the tank is stopped or reduced, and after part or all of the first washing liquid for desalination is drained from the first washing liquid supply device for desalination, the new first desalination washing solution The second supply adjustment valve of the supply device of the washing liquid is controlled to supply the first washing liquid for desalination as the first washing liquid for the first desalination liquid supply device so as to satisfy the first threshold value. The new No. 1 lotion for desalination. The desalination treatment device for chlorine-containing powder as described in item 15 of the scope of patent application, wherein the aforementioned desalination treatment device for chlorine-containing powder is further equipped with: a second liquid feeding device, which will be 1. The second filtrate obtained from the washing process of the first desalted cake at the solid-liquid separator is used in order to recycle at least a part of it as the second washing liquid for desalination. The washing liquid supply device for desalination is used for liquid feeding; and the second chloride ion concentration monitoring device is used to monitor the chloride ion concentration of the second washing solution for desalination. The desalination treatment device for chlorine-containing powder as described in item 17 of the scope of patent application, wherein the aforementioned desalination treatment device for chlorine-containing powder is further equipped with: a new second supply device for the washing liquid for desalination, which is In order to supply new second desalination lotion to the second desalination lotion supply device as the second desalination lotion, the second desalination lotion supply device is equipped with: third supply adjustment The valve is capable of changing the supply amount of the second demineralization washing liquid to the first demineralized cake from the second demineralization washing liquid supply device, and can be supplied from the second demineralization washing liquid. The new second desalination washing liquid supply device is equipped with: a fourth supply adjustment valve, which can supply the second desalination washing liquid The supply amount of the washing liquid to the device is set to be variable, which is configured as: when the chloride ion concentration of the second washing liquid for desalination exceeds the second threshold which is different from the first threshold , By controlling the third supply adjustment valve, the supply of the second washing liquid for desalination from the second washing liquid supply device for desalination to the first desalinated cake is stopped or reduced , And after draining part or all of the second washing liquid for desalination from the second washing liquid supply device for desalination, the second washing liquid supply device for the new second desalination washing solution 4 The supply adjustment valve is controlled to supply the new second desalination lotion to the second desalination lotion supply device as the second desalination lotion so as to meet the aforementioned second threshold value . For example, the desalination treatment device for chlorine-containing powder described in item 15 or 17 of the scope of patent application, wherein the desalination treatment device for chlorine-containing powder is further equipped with: a heavy metal insolubilization reaction tank, which is used Supplying from the first filtrate and the second filtrate that will not be reused as the first washing liquid for desalination or the second washing liquid for desalination is supplied from the first washing liquid for desalination The first washing liquid for desalination, which is fed as a drain liquid, and the second washing liquid for desalination, which is fed as a drain from the second washing liquid supply device for desalination. One or two or more selected from the group are collected and stored as the discharge liquid, and by adding a heavy metal trapping agent to this, the heavy metals contained in the discharge liquid are not dissolved into agglomerates Agglomerates; and The second solid-liquid separation device is a process of separating part or all of the liquid phase from the agglomerate containing liquid containing the aforementioned insoluble heavy metals to obtain the first agglomerated cake and the third filtrate; and agglomeration; and The aggregate-containing liquid conveying device is used to convey the aggregated aggregate-containing liquid processed in the heavy metal insolubilization reaction tank to the second solid-liquid separator. The desalination treatment device for chlorine-containing powder as described in item 19 of the scope of patent application, wherein the aforementioned desalination treatment device for chlorine-containing powder is further provided with: a third lotion supply device for desalination, which is used for In the second solid-liquid separator, washing is performed with a third washing liquid for desalination that is different from the first washing liquid for desalination and the second washing liquid for desalination to obtain a second aggregate cake and a second 4 The method of processing the filtrate is to supply the third lotion for desalination. As described in item 19 of the scope of patent application, the desalination treatment device for chlorine-containing powders, wherein the aforementioned desalination treatment device for chlorine-containing powders is further equipped with: a third liquid feeding device, which will be 2 The fourth filtrate obtained from the washing process of the first agglomerated cake at the solid-liquid separator is used in order to recycle at least a part of it as the first washing liquid for desalination. The washing liquid supply device for desalination is used for liquid feeding. Desalination treatment of chlorine-containing powder as described in item 19 of the scope of patent application An apparatus, wherein the desalination treatment device for the chlorine-containing powder is further provided with: a fourth liquid feeding device for washing the first desalted cake performed by the first solid-liquid separation device In order to use at least a part of the obtained second filtrate as the third washing liquid for desalination, it is used as a liquid feeding device for the third washing liquid supply device for desalination; and/or a fifth liquid feeding device , The fourth filtrate obtained by the washing process of the first agglomerated cake carried out in the second solid-liquid separator is used in order to use at least a part of it as the third washing liquid for desalination For recycling, it is used to feed liquid to the third washing liquid supply device for desalination; and the third chloride ion concentration monitoring device is used to monitor the chloride ion concentration of the third washing liquid for desalination. The desalination treatment device for chlorine-containing powder as described in item 22 of the scope of patent application, wherein the desalination treatment device for the aforementioned chlorine-containing powder is further equipped with: a new third supply device for the lotion for desalination, which is For supplying a new third lotion for desalination to the third lotion supply device for desalination as the third lotion for desalination, the third lotion supply device for desalination is equipped with: fifth supply adjustment The valve is capable of changing the supply amount of the third lotion for desalination to the first agglomerated cake from the third lotion supply device for desalination, and can be supplied from the third lotion for desalination. Installed The aforementioned new third desalination lotion supply device is provided with: a sixth supply adjustment valve capable of changing the supply amount of the lotion to the aforementioned third desalination lotion supply device, The system is configured as follows: when the chloride ion concentration of the third lotion for desalination exceeds the third threshold which is different from the first threshold and the second threshold, 5 The supply adjustment valve is controlled to stop or reduce the supply of the third lotion for desalination from the third lotion supply device for desalination to the first agglomerated cake, and to stop or reduce the supply of the third lotion for desalination from the third After a part or all of the third lotion for desalination is drained by the desalination lotion supply device, it is controlled by the aforementioned sixth supply adjustment valve of the new third desalination lotion supply device, To the third lotion supply device for desalination, as the third lotion for desalination, the new third lotion for desalination is supplied so as to satisfy the third threshold value. The desalination treatment device for chlorine-containing powder as described in item 19 of the scope of patent application, wherein the first solid-liquid separation device and the second solid-liquid separation device are performed by the same device. deal with.

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