CN118019598A - Desalination treatment method for chlorine-containing powder - Google Patents
Desalination treatment method for chlorine-containing powder Download PDFInfo
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- CN118019598A CN118019598A CN202280065923.8A CN202280065923A CN118019598A CN 118019598 A CN118019598 A CN 118019598A CN 202280065923 A CN202280065923 A CN 202280065923A CN 118019598 A CN118019598 A CN 118019598A
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- desalting
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- filtrate
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- 239000000460 chlorine Substances 0.000 title claims abstract description 195
- 229910052801 chlorine Inorganic materials 0.000 title claims abstract description 192
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 title claims abstract description 191
- 239000000843 powder Substances 0.000 title claims abstract description 127
- 238000000034 method Methods 0.000 title claims abstract description 77
- 238000011282 treatment Methods 0.000 title claims abstract description 40
- 238000010612 desalination reaction Methods 0.000 title abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 195
- 239000000706 filtrate Substances 0.000 claims abstract description 131
- 238000004140 cleaning Methods 0.000 claims abstract description 121
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000005406 washing Methods 0.000 claims description 232
- 238000011033 desalting Methods 0.000 claims description 187
- 239000004744 fabric Substances 0.000 claims description 48
- 238000000926 separation method Methods 0.000 claims description 36
- 239000002351 wastewater Substances 0.000 claims description 34
- 239000002002 slurry Substances 0.000 claims description 28
- 238000004064 recycling Methods 0.000 claims description 23
- 239000012065 filter cake Substances 0.000 claims description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 239000007791 liquid phase Substances 0.000 claims description 8
- 238000004090 dissolution Methods 0.000 abstract description 2
- 239000013505 freshwater Substances 0.000 description 28
- 239000000428 dust Substances 0.000 description 18
- 239000002956 ash Substances 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 12
- 239000004568 cement Substances 0.000 description 10
- 239000010881 fly ash Substances 0.000 description 7
- 239000002994 raw material Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000008235 industrial water Substances 0.000 description 4
- 229910052745 lead Inorganic materials 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 238000010828 elution Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 238000004255 ion exchange chromatography Methods 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003918 potentiometric titration Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- -1 that is Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 239000011538 cleaning material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 239000010791 domestic waste Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/70—Chemical treatment, e.g. pH adjustment or oxidation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/123—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using belt or band filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B2101/00—Type of solid waste
- B09B2101/30—Incineration ashes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Toxicology (AREA)
- General Engineering & Computer Science (AREA)
- Processing Of Solid Wastes (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Gasification And Melting Of Waste (AREA)
- Treatment Of Sludge (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention provides a desalination treatment method of chlorine-containing powder, which can effectively reduce the water consumption of the whole system. A desalination treatment method for chlorine-containing powder, wherein each chlorine-containing powder is repeatedly subjected to a slurrying step, a chlorine dissolution step, a desalinated cake forming step, a first desalinated cake cleaning step and a second desalinated cake cleaning step, at least a part of a third filtrate obtained in the second desalinated cake cleaning step is recovered and stored, and is reused as a second desalinating cleaning liquid for the first desalinating cake cleaning step, a third desalinating cleaning liquid for the second desalinating cake cleaning step, or both corresponding to chlorine-containing powder supplied to a subsequent stage, and after one or more times of reuse, the recovered third filtrate is recycled as a first desalinating cleaning liquid for the slurrying step.
Description
[ Technical field ]
The present invention relates to a desalination treatment method for reducing chlorine content from chlorine-containing powder such as incineration ash.
[ Background Art ]
From the viewpoint of resources and environmental protection, incineration ash generated by incinerating municipal waste such as general waste and industrial waste, clinker dust generated by cement factories, and the like are effectively reused as cement raw materials. However, they are powders containing a large amount of chlorine, which interferes with the quality of cement, the normal operation of cement manufacturing facilities, and therefore require desalting treatment when used as a cement raw material. In this case, a large amount of washing water for washing is required, and the reduction of the amount of washing water used is a problem.
Regarding such a problem, for example, patent document 1 (japanese patent application laid-open No. 2003-211129) discloses a method for cleaning ash, characterized in that: a multi-stage washing step comprising a mixing device for mixing ash and water and a solid-liquid separation device for separating the mixture from the mixing device into ash and water is provided, wherein the ash is washed in a multi-stage manner, the flow of the ash and water is made countercurrent, and the ash solid-liquid separated by the first-stage solid-liquid separation device is dehydrated to a moisture content of less than 60%. Further, ash desalination can be efficiently performed with a small amount of washing water (patent document 1 paragraph 0021).
Further, for example, patent document 2 (japanese unexamined patent publication No. 2005-246295) discloses a treatment apparatus for incineration ash, which includes a plurality of cylindrical filters for cleaning incineration ash, supplies new cleaning water to a final stage, sequentially uses recovered cleaning water sucked and recovered at each stage as cleaning water of a preceding stage, and cleans incineration ash transported from the first stage to the final stage, and is characterized in that: the cylindrical filters of each stage include a recovered cleaning water supply unit that supplies a part of the recovered cleaning water sucked and recovered by the cylindrical filter to the mixture held on the outer periphery of the filter at a position upstream in the cylinder rotation direction with respect to the cleaning water supply position of the stage. In addition, when the same cleaning effect as in the prior art is obtained, the number of stages of the cylindrical filter can be reduced, and the water consumption can be reduced (patent document 2, paragraph 0014).
[ Prior Art literature ]
Patent literature
Patent document 1: japanese patent laid-open No. 2003-211129
Patent document 2: japanese patent laid-open publication No. 2005-246295
[ Summary of the invention ]
Problems to be solved by the invention
In patent documents 1 and 2, in the desalination treatment of chlorine-containing powder such as incineration ash, the amount of water used for the desalination cake obtained by adding washing water to the powder to dissolve chlorine into a liquid phase and then dehydrating the dissolved chlorine is reduced by providing a multistage washing device for removing chlorine components from the residue in order to efficiently remove chlorine components remaining as residues in the cake water.
However, according to the findings of the present inventors, when a multistage washing apparatus is provided to wash a desalted cake as in patent documents 1 and 2, there are the following problems: the cleaning of the residue dust adhering to the filter cloth and the device itself instead leads to an increase in water usage, and the water consumption of the entire system cannot be suppressed.
Accordingly, an object of the present invention is to provide a method for desalting chlorine-containing powder, which can effectively reduce the water consumption of the whole system.
Means for solving the problems
In order to achieve the above object, a first aspect of the present invention provides a method for desalting chlorine-containing powder, comprising:
a slurrying step of mixing a chlorine-containing powder with a first desalting cleaning liquid to prepare a slurry;
a chlorine dissolving step of dissolving chlorine contained in the chlorine-containing powder into a liquid phase in the slurry;
a desalted cake forming step of dehydrating the slurry from which the chlorine has been eluted to obtain a first desalted cake and a first filtrate;
A first desalted filter cake washing step of washing the first desalted filter cake with a second desalting washing liquid different from the first desalting washing liquid to obtain a second desalted filter cake and a second filtrate; and
A second desalted cake washing step of washing the second desalted cake with a third desalting washing liquid different from the first desalting washing liquid and the second desalting washing liquid to obtain a third desalted cake and a third filtrate,
And repeating the slurrying step, the chlorine dissolving step, the desalted cake forming step, the first desalted cake washing step, and the second desalted cake washing step for each chlorine-containing powder supplied, recovering and storing at least a part of the third filtrate obtained in the second desalted cake washing step, and reusing the recovered filtrate as the second desalting cleaning liquid for the first desalted cake washing step, the third desalting cleaning liquid for the second desalted cake washing step, or both, which corresponds to the chlorine-containing powder supplied to a subsequent stage, and recycling the recovered filtrate as the first desalting cleaning liquid after one or more times.
According to the above-described method for desalting chlorine-containing powder, chlorine contained in chlorine-containing powder is dissolved in a liquid phase of the slurry to obtain a first desalted cake and a first filtrate, and the first desalted cake is washed with a second desalting washing liquid different from the first desalting washing liquid to obtain a second desalted cake and a second filtrate, and the second desalted cake is washed with a third desalting washing liquid different from the first desalting washing liquid and the second desalting washing liquid to obtain a third desalted cake and a third filtrate, whereby the third desalted cake from which chlorine is sufficiently removed can be obtained. Therefore, the method is useful for the raw material of cement such as incineration ash containing chlorine. At least a part of the third filtrate obtained in the second desalted cake washing step is recovered and stored, and therefore, the third filtrate can be reused as a desalting cleaning liquid for chlorine-containing powder supplied to the subsequent stage without providing a multistage apparatus for washing the desalted cake. Further, since the first desalting cleaning liquid is recycled as the first desalting cleaning liquid after one or more times of reuse, the water consumption of the entire system can be reduced while maintaining the desalting effect by the desalting treatment of the chlorine-containing powder. In addition, by reducing the water consumption, the leaching amount of heavy metals can be suppressed.
In order to achieve the above object, a second aspect of the present invention provides a method for desalting chlorine-containing powder, wherein in the method for desalting chlorine-containing powder of the first aspect, the step of forming the desalted cake, the step of cleaning the first desalted cake, and the step of cleaning the second desalted cake are performed by a solid-liquid separator of a filter cloth, and at least a part of filter cloth cleaning wastewater obtained when cleaning the filter cloth is recycled as the second desalting cleaning liquid, the third desalting cleaning liquid, or both.
According to the above configuration, since the solid-liquid separation device using the filter cloth is used, the formation of the slurry to the desalted cake and the subsequent cleaning can be efficiently performed over the supplied large-capacity chlorine-containing powder. In order to prevent clogging of the filter cloth of the solid-liquid separator to be used, it is necessary to constantly clean the entire operation of the apparatus, and the cleaning wastewater is recycled as the second desalting cleaning liquid, the third desalting cleaning liquid, or both, so that the water consumption of the entire system can be further reduced.
In order to achieve the above object, a third aspect of the present invention provides a method for desalting chlorine-containing powder, wherein in the method for desalting chlorine-containing powder of the second aspect, the solid-liquid separation device is a filter press or a belt filter.
According to the above configuration, a conventional apparatus system can be used as the solid-liquid separation apparatus.
In order to achieve the above object, a fourth aspect of the present invention provides a method for desalting chlorine-containing powder, wherein in the method for desalting chlorine-containing powder of the second aspect, the solid-liquid separation device is a filter press, at least a part of the filter cloth washing wastewater is subjected to solid-liquid separation, and a liquid portion thereof is recycled as the second desalting washing liquid, the third desalting washing liquid, or both.
According to the above configuration, as a solid-liquid separation device using a filter cloth, a conventional device system can be used. In addition, the filter press is a device capable of cleaning a cake, and a general cake cleaning mechanism is to feed water from the side of a back filtering surface of a filter cloth. Therefore, the filter cloth washing wastewater containing solid components is directly used for filter cake washing water (for the second and third desalting washing liquids) and causes clogging of the filter cloth, and therefore, the filter cloth washing wastewater can be suitably used as the second and third desalting washing liquids by performing solid-liquid separation.
In order to achieve the above object, a fifth aspect of the present invention provides a method for desalting chlorine-containing powder, wherein in the method for desalting chlorine-containing powder, the step of forming the desalted cake, the step of cleaning the first desalted cake, and the step of cleaning the second desalted cake are performed by a solid-liquid separator of a filter cloth, and at least a part of filter cloth cleaning wastewater obtained when the filter cloth is cleaned is recycled as the first desalting cleaning liquid.
According to the above configuration, since the solid-liquid separation device using the filter cloth is used, the formation of the slurry to the desalted cake and the subsequent cleaning can be efficiently performed over the supplied large-capacity chlorine-containing powder. In addition, in order to prevent clogging of the filter cloth of the solid-liquid separation apparatus used, it is necessary to perform cleaning all the time during the entire operation of the apparatus, and the cleaning wastewater is recycled as the first desalting cleaning liquid, so that the water consumption of the entire system can be further reduced.
In order to achieve the above object, a sixth aspect of the present invention provides a method for desalting chlorine-containing powder, wherein in the method for desalting chlorine-containing powder,
When the third filtrate obtained in the second desalted cake washing step is reused, at least a part of the third filtrate is recovered and stored in a storage tank, and any one or more of the following (1) to (5) is observed to determine whether or not the reuse is possible.
(1) Total time of the reuse treatment of the third filtrate
(2) The total water amount of the third filtrate subjected to the recycling treatment
(3) The pH of the third filtrate
(4) Chloride ion concentration of the third filtrate
(5) Conductivity of the third filtrate
According to the above configuration, the use of a cleaning liquid unsuitable for the cleaning of the desalted cake can be avoided in the reuse of the third filtrate.
In order to achieve the above object, a seventh aspect of the present invention provides a method for desalting chlorine-containing powder, wherein at least a part of the second filtrate obtained in the first cake washing step is recovered and stored, and reused as the second desalting cleaning liquid for the first cake washing step corresponding to chlorine-containing powder supplied to a subsequent stage, and after one or more times of reuse, the second desalting cleaning liquid is recycled as the first desalting cleaning liquid.
According to the above configuration, the second filtrate obtained in the first desalted cake washing step is reused, so that the water consumption of the entire system can be reliably reduced. At least a part of the second filtrate is recovered and stored, so that the second filtrate can be reused as a desalting cleaning liquid corresponding to chlorine-containing powder supplied to a subsequent stage without providing a device for cleaning a desalted cake in multiple stages.
In order to achieve the above object, an eighth aspect of the present invention provides a method for desalting chlorine-containing powder, wherein in the method for desalting chlorine-containing powder of the seventh aspect,
When the second filtrate obtained in the first desalted cake washing step is reused, at least one of the following (1) to (5) is observed in a storage tank in which at least a part of the second filtrate is recovered and stored to determine whether the reuse is possible.
(1) Total time of the second filtrate to be reused
(2) The total water content of the second filtrate is reused
(3) The pH of the second filtrate
(4) Concentration of chloride ions in the second filtrate
(5) Conductivity of the second filtrate
According to the above configuration, the use of a cleaning liquid unsuitable for the cleaning of the desalted cake can be avoided when the second filtrate is reused.
In order to achieve the above object, a ninth aspect of the present invention provides a method for desalting chlorine-containing powder, wherein in the method for desalting chlorine-containing powder,
Washing the first desalted cake with the second desalting washing liquid in the first desalted cake washing step a plurality of times, and/or
And washing the second desalted cake with the third desalting washing liquid in the second desalted cake washing step a plurality of times.
According to the above configuration, the desalting treatment can be reliably performed by a plurality of cake washes.
In order to achieve the above object, a tenth aspect of the present invention provides a method for desalting chlorine-containing powder, wherein in the method for desalting chlorine-containing powder,
The water consumption is 1.5 to 4 parts by mass based on 1 part by mass of the dry weight of the chlorine-containing powder to be desalted.
With the above configuration, the amount of water used in the desalination treatment of chlorine-containing powder such as incineration ash can be significantly reduced. In addition, by reducing the water consumption, the leaching amount of heavy metals can be suppressed.
In order to achieve the above object, an eleventh aspect of the present invention provides a method for desalting chlorine-containing powder, wherein in the method for desalting chlorine-containing powder,
The desalted cake forming step, the first desalted cake washing step, and the second desalted cake washing step are performed by one solid-liquid separation apparatus.
According to the above configuration, the device structure can be simplified, and therefore, the initial cost and the running cost can be reduced. In addition, the use of water for cleaning the residue dust adhering to the filter cloth and the device itself can be suppressed to the minimum.
[ Brief description of the drawings ]
FIG. 1 is a flowchart showing an embodiment of a method for desalting chlorine-containing powder according to the present invention.
Fig. 2 is a flowchart for explaining a case where washing is performed in a multiple-stage cake washing step with a washing liquid for desalination in one example of a method for desalting chlorine-containing powder of the present invention, and fig. 2A shows a case where washing of a second cake with the washing liquid for desalination is performed multiple times with a third washing liquid for desalination, fig. 2B shows a case where washing of a first cake with the washing liquid for desalination is performed multiple times with the second washing liquid for desalination, and fig. 2C shows a case where washing is performed multiple times with the washing liquid for desalination and washing is performed multiple times with the washing liquid for desalination.
FIG. 3 is a flowchart illustrating a case where the desalted cake forming step, the first desalted cake washing step and the second desalted cake washing step are performed by one solid-liquid separator in another example of the method for desalting chlorine-containing powder of the present invention.
FIG. 4 is a flowchart showing a case where a desalinated cake forming step, a first desalinated cake cleaning step and a second desalinated cake cleaning step are performed by one solid-liquid separator in another example of the method for desalinating chlorine-containing powder according to the present invention, and a solid-liquid separator using a filter cloth is used as the solid-liquid separator.
Fig. 5 is a flowchart illustrating the cases of comparative examples 1 to 7 performed in test example 1.
Fig. 6 is a flowchart illustrating the cases of examples 1 to 5 performed in test example 1.
Fig. 7 is a flowchart illustrating the case of example 6 performed in test example 1.
FIG. 8 is a graph showing the relationship between the fresh water ratio and the chlorine concentration of the desalted cake after washing, which was obtained as a result of test example 1.
Fig. 9 is a graph showing the relationship between the chlorine concentration and the Pb concentration in the wastewater component (fig. 9A) and the relationship between the chlorine concentration and the Zn concentration in the wastewater component (fig. 9B) obtained as a result of test example 1.
Fig. 10 is a graph showing the relationship between the chlorine concentration of the desalted cake and the Pb concentration in the wastewater component (fig. 10A) and the relationship between the chlorine concentration of the desalted cake and the Zn concentration in the wastewater component (fig. 10B) obtained as a result of test example 1.
Fig. 11 is a graph showing the relationship between the difference obtained by dividing the chlorine concentration of the desalted cake by the fresh water ratio and subtracting the value of the example from the value of the comparative example at the same fresh water ratio and the corresponding fresh water ratio, obtained as a result of test example 1.
Detailed description of the preferred embodiments
The object of the desalination treatment method of chlorine-containing powder of the present invention is not particularly limited as long as it is a powder containing chlorine. Examples thereof include incineration fly ash, fusion fly ash, and chlorine bypass dust. These are wastes that have been conventionally used effectively as cement raw materials after desalting, and chlorine (Cl) is usually contained at a concentration of about 10 to 30 mass% in typical municipal waste incineration fly ash, that is, fly ash generated when household waste is incinerated ("incineration fly ash"), and chlorine is usually contained at a concentration of about 10 to 40 mass% in fly ash generated by a gasification melting furnace ("melting fly ash"). On the other hand, chlorine bypass dust, which is dust contained in the exhaust gas of the cement kiln, generally contains chlorine at a concentration of about 10 to 40 mass%.
According to the method for desalting chlorine-containing powder of the present invention, the concentration of chlorine in the chlorine-containing powder as described above can be reduced to about 3 mass% or less, more typically to about 2 mass% or less, and can be effectively utilized as, for example, a cement raw material. The concentration of chlorine in the chlorine-containing powder can be measured by a known method, and for example, a potentiometric titration method, an ion chromatography method, a basic parameter method based on fluorescent X-ray analysis, and the like, which are applicable to JIS a1154 "test method for chloride ions contained in hardened concrete", can be preferably exemplified.
The present invention will be described more specifically below with reference to the drawings.
FIG. 1 is a flowchart showing an embodiment of a method for desalting chlorine-containing powder according to the present invention.
As described in this embodiment, the method for desalting chlorine-containing powder of the present invention comprises: a slurrying step of mixing a chlorine-containing powder with a first desalting cleaning liquid to prepare a slurry; a chlorine dissolving step of dissolving chlorine contained in the chlorine-containing powder into a liquid phase in the slurry; a desalted cake forming step of dehydrating the slurry in which chlorine is eluted to obtain a first desalted cake and a first filtrate; a first desalted filter cake washing step of washing the obtained first desalted filter cake with a second desalting washing liquid different from the first desalting washing liquid to obtain a second desalted filter cake and a second filtrate; and a second desalted cake washing step of washing the obtained second desalted cake with a third desalting washing liquid different from the first desalting washing liquid and the second desalting washing liquid to obtain a third desalted cake and a third filtrate.
In order to prepare a slurry by mixing the first desalting cleaning solution with the chlorine-containing powder, or to dissolve chlorine contained in the chlorine-containing powder into a liquid phase in the slurry, a predetermined dissolution tank or the like known to those skilled in the art may be used. In addition, for dewatering the slurry or washing the desalted cake formed by dewatering by adding a desalting washing liquid, a predetermined mixing tank, dewatering device, or the like known to those skilled in the art may be used. The movement of the slurry and the liquid may be performed using a fluid supply device, a supply tank, a fluid supply pipe, a predetermined storage tank, or the like, which are known to those skilled in the art.
The above-described slurrying step, chlorine elution step, desalted cake forming step, first desalted cake washing step, and second desalted cake washing step (the first, second, and third steps are repeated in fig. 1) are repeated for each chlorine-containing powder to be supplied, and at this time, at least a part of the third filtrate obtained in the second desalted cake washing step is recovered and stored and reused as a desalting cleaning liquid corresponding to the chlorine-containing powder to be supplied to the subsequent stage. More specifically, the second desalting cleaning liquid used in the first desalting cake cleaning step, the third desalting cleaning liquid used in the second desalting cake cleaning step, or both are reused. The third filtrate is reused one or more times and then recycled as the first desalting cleaning liquid.
Here, "chlorine-containing powder supplied to the subsequent stage" means a powder different from the chlorine-containing powder existing in the same process immediately before that. For this reason, for example, in the embodiment shown in fig. 1, the desalination treatment is repeatedly performed in the first stage, the second stage, and the third stage in time series, and the third filtrate from the first stage is reused in the second stage, but it may be reused as the second desalination cleaning liquid, the third desalination cleaning liquid, or both corresponding to chlorine-containing powder supplied to the third stage or later.
The desalted cake washing step of further washing the formed desalted cake is divided into a first stage and a second stage in the order of the time of the step of treating the formed desalted cake, but may be further divided into a plurality of stages, and a multistage desalted cake washing step such as a third desalted cake washing step, a fourth desalted cake washing step, a fifth desalted cake washing step, a subsequent desalted cake washing step, and the like may be further provided in correspondence with the steps. In this case, it is preferable that the filtrate from the desalted cake washing step with an arbitrary number is given a number given in the order of the time of the steps in the chlorine-containing powder supplied to the subsequent stage, and is reused in the desalted cake washing step with the same number or a number preceding the same number.
In the embodiment shown in fig. 1, at least a part of the second filtrate obtained in the first desalted cake washing step is recovered and stored, and is reused as the second desalting cleaning liquid for the first desalted cake washing step corresponding to the chlorine-containing powder supplied to the subsequent stage. The second filtrate is reused one or more times and then recycled as the first desalting cleaning liquid.
Here, as described above, the "chlorine-containing powder supplied to the subsequent stage" means a powder different from the chlorine-containing powder existing in the same process immediately before that. Therefore, for example, in the embodiment shown in fig. 1, the second filtrate from the first stage is reused in the second stage, but may be reused as the second desalting cleaning liquid corresponding to the chlorine-containing powder supplied to the third stage or later. In addition, the desalted cake washing step may be further provided in a plurality of stages such as a third desalted cake washing step, but in this case, the step of washing the desalted cake formed by dehydrating the slurry first becomes the first desalted cake washing step, and the desalting cleaning liquid used therein becomes the second desalting cleaning liquid.
In the method for desalting chlorine-containing powder of the present invention, the reuse of the second filtrate is not necessarily required. In the embodiment shown in fig. 1, the first filtrate obtained in the desalted cake forming step is treated as wastewater, but may be reused as the first desalting cleaning liquid corresponding to chlorine-containing powder supplied to the subsequent stage, if necessary.
In the embodiment shown in fig. 1, fresh water, which is water newly supplied to the system, is used for all the desalting cleaning liquid used in the desalting treatment of the chlorine-containing powder in the first stage. As the fresh water, water other than sea water such as industrial water (fresh water) and chlorine-containing water in which the concentration of chlorine ions is adjusted by adding a regulator such as NaCl or KCl to the water as needed can be used, but it is convenient to dilute sea water with industrial water (fresh water) in a region where a large amount of industrial water (fresh water) cannot be used, or when the use of industrial water (fresh water) is limited in terms of cost or the like.
In addition, the chlorine ion concentration of the desalting cleaning liquid introduced into the system may increase with reuse, and for example, in the case of the first desalting cleaning liquid, it is preferably suppressed to be in the range of 3 to 15 mass%. In the case of the second desalting cleaning liquid, the content is preferably controlled to be in the range of 0.5 to 6 mass%. In the case of the third desalting cleaning liquid, the content is preferably controlled to be in the range of 0 to 2 mass%.
FIG. 2 shows a case where a plurality of washing steps of a desalted cake are performed with a washing liquid for desalting in an example of a desalting treatment method of chlorine-containing powder of the present invention. That is, in the desalting treatment method of the present invention, for example, as shown in FIG. 2A, the second desalted cake may be washed with the third desalting washing liquid a plurality of times. Further, as shown in fig. 2B, the second desalting cleaning liquid may be used to clean the first desalted cake a plurality of times. Further, as shown in fig. 2C, the cleaning with the second desalting cleaning liquid may be performed a plurality of times, and the cleaning with the third desalting cleaning liquid may be performed a plurality of times. The chlorine-containing powder may be treated as wastewater after any number of uses, or may be reused for supplying chlorine-containing powder to a subsequent stage.
FIG. 3 shows a case where the desalted cake forming step, the first desalted cake washing step and the second desalted cake washing step are performed by one solid-liquid separator in the method for desalting chlorine-containing powder of the present invention. Specifically, the solid-liquid separation device may be, for example, a filter press, a belt filter, or the like. That is, in the example shown in fig. 3, the slurry having undergone the chlorine elution step is introduced into the solid-liquid separation apparatus 1, and dehydrated in accordance with the general standard of the apparatus to obtain a first filtrate. Further, a second desalting cleaning liquid was introduced into the dehydrated cake held in the apparatus, and the cake was cleaned in accordance with a general cleaning standard of the apparatus to obtain a second filtrate. Further, a third desalting cleaning liquid is introduced into the cake held in the apparatus and cleaned with the second desalting cleaning liquid, and the cake is cleaned in accordance with a general cleaning standard of the apparatus to obtain a third filtrate. Thereafter, the second filtrate and the third filtrate are stored in the storage tanks 2 and 3, respectively, and can be supplied at desired timings as a cleaning liquid for chlorine-containing powder to be supplied to the subsequent stage.
In the example shown in fig. 3, the storage tanks 2 and 3 are provided with a measuring device 4 and a measuring device 5, respectively, so that the properties of the liquid in the tanks can be observed. The observation is not limited, and may be, for example, the following (1) to (5).
(1) Total time of the second filtrate or the third filtrate for the recycling treatment: measuring pump run time for reuse treatment with timer
(2) Total water amount of the second filtrate or the third filtrate subjected to the recycling treatment: measuring water volume using a flowmeter
(3) PH of the second filtrate or the third filtrate: measuring pH of liquid in tank by pH meter
(4) Chloride ion concentration of the second filtrate or the third filtrate: measuring chloride ion concentration of liquid in tank by ion chromatograph and potentiometric titration method
(5) Conductivity of the second filtrate or the third filtrate: measuring conductivity of liquid in tank by conductivity meter
For example, as the standard of the chloride ion concentration of (4), the second desalting cleaning liquid and the third desalting cleaning liquid are preferably suppressed to be in the range of 0.5 to 6 mass% in the case of the second filtrate, similarly to the above. In the case of the third filtrate, the content is preferably controlled to be in the range of 0 to 2 mass%.
On the other hand, for example, in the case of the second filtrate, the total time of the above (1) is preferably suppressed within a range of 0 minutes to 10 minutes. In the case of the third filtrate, the third filtrate is preferably suppressed within a range of 0 minutes to 20 minutes.
For example, the second filtrate is preferably suppressed to be in the range of 0 to 3.5 parts by mass based on 1 part by mass of the dry weight of the chlorine-containing powder to be desalted, based on the total amount of water in (2). In the case of the third filtrate, the content is preferably controlled to be in the range of 0 to 3.5 parts by mass.
In the case of the second filtrate, for example, the pH of the second filtrate is preferably controlled to be in the range of pH7 to pH 13. In the case of the third filtrate, the pH is preferably controlled to be in the range of 7 to 12.5.
In the case of the second filtrate, for example, the conductivity of the second filtrate is preferably controlled to be in the range of 3S/m to 30S/m. In the case of the third filtrate, the concentration is preferably controlled within a range of 0S/m to 10S/m.
FIG. 4 shows another example of the method for desalting chlorine-containing powder of the present invention. That is, in the desalination treatment method of the present invention, for example, as described in fig. 3, the solid-liquid separation apparatus 1 is used, and the desalinated cake forming step, the first desalinated cake cleaning step, and the second desalinated cake cleaning step are performed by one solid-liquid separation apparatus, and in this case, a solid-liquid separation apparatus using a filter cloth may be used. Specifically, the solid-liquid separation device 1 may be, for example, a filter press, a belt filter, or the like. In general, in a solid-liquid separation apparatus using a filter cloth, in order to prevent clogging of the filter cloth, it is necessary to perform cleaning all the time during the entire operation of the apparatus, a large amount of filter cloth cleaning wastewater is generated, and this is stored in the storage tank 6, and can be supplied at a desired timing as a cleaning liquid containing chlorine powder. In this case, since the filter cloth washing wastewater contains insoluble matter washed out from the filter cloth used, the liquid portion thereof may be treated by the solid-liquid separation device 7 to be used as a washing liquid for chlorine-containing powder. In particular, in the case of a filter press, the use of filter cloth washing wastewater containing solid components as it is in the filter cake washing water (for the second and third desalting washing liquids) may cause clogging of the filter cloth, and thus, by performing solid-liquid separation, the filter cloth washing wastewater can be suitably used as the second and third desalting washing liquids or the filter cloth washing liquid. The solid-liquid separation device 7 may be, for example, a filter press, a belt filter, a belt press, a vacuum cylindrical filter, a settling tank, or the like.
The method for desalting chlorine-containing powder of the present invention is not limited, but the water amount is 1.5 to 4 parts by mass based on 1 part by mass of the dry weight of the chlorine-containing powder to be desalted. Here, as the "water consumption amount", the preferable range of the water consumption amount can be calculated by dividing the amount of water newly supplied to the entire system by the dry weight of chlorine-containing powder supplied to the system per unit time. In addition, the water recycling method comprises the steps of recycling water, wherein the water is used in the following steps: about 1.5 to 7.0 parts by mass for the slurrying step, about 0.5 to 5.0 parts by mass for the first desalted cake washing step, and about 0.5 to 5.0 parts by mass for the second desalted cake washing step. The amount of the catalyst used in the filter cloth cleaning step is about 0.1 to 2 parts by mass, as required.
The present invention is not limited to the above-described embodiments, and various combinations and modifications may be made within the scope of the present disclosure, and such embodiments are also included in the technical scope of the present invention.
Examples
The present invention will be described more specifically below with reference to test examples. However, the scope of the present invention is not limited to these examples.
Test example 1]
The effect of recycling the wastewater from the desalted cake washing was examined by subjecting the chlorine bypass dust (chlorine concentration based on the fluorescent X-ray analysis basic parameter method: 20.94%) discharged from the cement plant to the treatments of slurrying, chlorine elution, desalted cake formation and desalted cake washing with the prescribed amounts of water shown in Table 1. In the test, a beaker, propeller stirrer, and buchner funnel were used. Specifically, a predetermined amount of water and a predetermined amount of dust are mixed in a beaker, and slurried. The structure is as follows: the slurry placed on the filter paper was dehydrated by using a buchner funnel with a filter paper (quantitative filter paper No.5 c) and a filtrate receiving bottle attached thereto, and the inside of the bottle was depressurized by a vacuum pump to suck the slurry, and the desalted cake was washed by spraying a washing liquid for washing the desalted cake onto the desalted cake in a state where the desalted cake was placed on the filter paper of the buchner funnel. Then, the desalted cake was separated from the filter paper to obtain a desalted cake, and then the filter paper was mounted again on a buchner funnel, and the inside of the bottle was depressurized by a vacuum pump, and the filter paper was cleaned by spraying a cleaning liquid onto the filter paper, and solid-liquid separation was performed.
TABLE 1
Equivalent weight parts of water relative to the dry weight of the chlorine bypass dust
More specifically, as shown in fig. 5, in comparative examples 1 to 7, 1.5 to 5.0 parts by mass of fresh water was added to 1 part by mass of the dry weight of the chlorine bypass dust to be subjected to the first stage treatment to slurried (hereinafter, the water amount ratio will be simply referred to as "1.5 equivalents" or the like with respect to the dry weight of the chlorine bypass dust), and 3.5 equivalents, 3 equivalents, 2.5 equivalents, 2 equivalents, 1.25 equivalents, or 1 equivalent of fresh water was added to the desalted cake after dehydration to clean. In addition, 1.5 equivalents of fresh water was used for cleaning the filter paper, and 3.5 equivalents, 3 equivalents, 2 equivalents, 1.25 equivalents, or 1 equivalent of the second filtrate discharged from the first stage was used in combination with 1.5 equivalents of filter paper cleaning wastewater containing no solid component discharged from the first stage in slurrying the chlorine bypass dust for the second stage treatment. In comparative example 7, no washing of the desalted cake was performed.
As shown in fig. 6, in examples 1 to 5, 1.5 to 5.0 equivalents of fresh water was added to the chlorine bypass dust for the first stage treatment to slurry, and 3.5 equivalents, 2.5 equivalents, 1.5 equivalents, 1.25 equivalents, or 1 equivalent of fresh water was added to the desalted cake after dehydration to clean the desalted cake (first desalted cake cleaning), and further the same equivalent of fresh water was used to repeatedly clean the desalted cake (second desalted cake cleaning). In addition, as in comparative examples 1 to 7, 1.5 equivalents of fresh water was used for cleaning the filter paper, and 3.5 equivalents, 2.5 equivalents, 1.5 equivalents, 1.25 equivalents, or 1 equivalent of the second filtrate discharged from the first stage was used in combination with 1.5 equivalents of filter paper cleaning wastewater discharged from the first stage in slurrying the chlorine bypass dust for the second stage treatment. However, in examples 1 to 5, the washing of the first desalted cake in the second stage desalting treatment was performed using 3.5 equivalents, 2.5 equivalents, 1.5 equivalents, 1.25 equivalents or 1 equivalent of the third filtrate discharged from the washing of the second desalted cake in the first stage.
On the other hand, as shown in fig. 7, in example 6, slurrying, first desalted cake washing, second desalted cake washing and filter paper washing were all performed with 1.5 equivalents of water, wherein the second filtrate discharged from the washing of the first desalted cake of the first stage was used in slurrying of the chlorine bypass dust for the second stage treatment, the third filtrate discharged from the washing of the second desalted cake of the first stage was used in the first desalted cake washing, and the filter paper washing wastewater discharged from the first stage was used in the second desalted cake washing.
Regarding the treated washings, the chlorine concentration was measured by the fluorescent X-ray analysis base parameter method. Further, regarding the wastewater, ICP analysis (Pb, zn) and ion chromatography (Cl) of the first filtrate discharged at the time of formation of the desalted cake were performed.
Table 2 summarizes the total amount of fresh water used in each stage of treatment of the chlorine bypass dust, and the chlorine concentration of the cleaning material and the results of the component analysis of the wastewater.
TABLE 2
Equivalent weight relative to dry weight of chlorine bypass dust; parts by mass of water
The following will be apparent from the results.
As shown in fig. 8, the chlorine concentration of the dehydrated cake after washing increases with a decrease in the fresh water ratio in both the comparative example and the example. However, by recycling the washing water as in the example, the fresh water ratio (wastewater treatment amount) can be reduced at the same chlorine concentration of the dewatered cake as in the comparative example. For example, in comparative example 3, the total amount of fresh water used in each stage of the treatment of the chlorine bypass dust was 4 equivalents, and the chlorine concentration at this time was 0.59% -dry, whereas in example 1, in order to obtain the same chlorine concentration as in comparative example 3, 0.57% -dry, 3 equivalents were sufficient as the total amount of fresh water.
On the other hand, the Pb and Zn components in the wastewater were decreased by the increase in the Cl concentration in the wastewater due to the decrease in the fresh water ratio in both the comparative example and the example (FIG. 9). Further, by recycling the washing water as in the example, the chlorine concentration of the dehydrated cake can be reduced (the desalting performance is maintained), and the Pb and Zn concentrations in the wastewater can be reduced (FIG. 10). Therefore, it is found that the cost of the wastewater treatment chemical required for the treatment of Pb and Zn can be reduced.
In fig. 11, the difference obtained by subtracting the value of the example from the value of the comparative example at the same fresh water ratio is calculated as the residual chlorine concentration per unit water amount, which is the value obtained by dividing the chlorine concentration of the dehydrated cake by the fresh water ratio, and a map is created corresponding to the fresh water ratio.
As a result, as shown in fig. 11, when the effect of the desalination treatment obtained by recycling the washing water in the example is compared with the comparative example in which the fresh water ratio is the same, the smaller the fresh water ratio is, the more remarkable.
As described above, the water consumption of the entire system required for the purpose of desalination treatment can be reduced by recycling the washing water.
[ Description of the symbols ]
1: A solid-liquid separation device (for dewatering the slurry or filter cake); 2.3, 6: a storage tank; 4. 5: a measuring device; 7: a solid-liquid separation device (for removing cleaning residues on the filter cloth).
Claim (modification according to treaty 19)
[ Modified ] A method for desalting chlorine-containing powder, comprising:
a slurrying step of mixing a chlorine-containing powder with a first desalting cleaning liquid to prepare a slurry;
a chlorine dissolving step of dissolving chlorine contained in the chlorine-containing powder into a liquid phase in the slurry;
a desalted cake forming step of dehydrating the slurry from which the chlorine has been eluted to obtain a first desalted cake and a first filtrate;
A first desalted filter cake washing step of washing the first desalted filter cake with a second desalting washing liquid different from the first desalting washing liquid to obtain a second desalted filter cake and a second filtrate; and
A second desalted cake washing step of washing the second desalted cake with a third desalting washing liquid different from the first desalting washing liquid and the second desalting washing liquid to obtain a third desalted cake and a third filtrate,
Repeating the slurrying step, the chlorine dissolving step, the desalted cake forming step, the first desalted cake washing step, and the second desalted cake washing step for each chlorine-containing powder supplied, recovering and storing at least a part of the third filtrate obtained in the second desalted cake washing step, reusing the recovered filtrate as the second desalting cleaning liquid for the first desalted cake washing step, the third desalting cleaning liquid for the second desalted cake washing step, or both, which correspond to chlorine-containing powder supplied to a subsequent stage, recycling the recovered filtrate one or more times, recycling the recovered filtrate as the first desalting cleaning liquid,
And, by performing the desalted cake forming step, the first desalted cake washing step, and the second desalted cake washing step by a solid-liquid separator using a filter cloth, at least a part of filter cloth washing wastewater obtained when washing the filter cloth is recycled as the second desalting washing liquid, the third desalting washing liquid, or both.
2.[ Deletion ]
[ Modified ] the method for desalting chlorine-containing powder according to claim 1, wherein the solid-liquid separation device is a filter press or a belt filter.
[ Modified ] the method for desalting chlorine-containing powder according to claim 1, wherein the solid-liquid separation device is a filter press, at least a part of the filter cloth washing wastewater is subjected to solid-liquid separation, and a liquid portion thereof is recycled as the second desalting washing liquid, the third desalting washing liquid, or both.
[ Modified ] A method for desalting chlorine-containing powder, comprising:
a slurrying step of mixing a chlorine-containing powder with a first desalting cleaning liquid to prepare a slurry;
a chlorine dissolving step of dissolving chlorine contained in the chlorine-containing powder into a liquid phase in the slurry;
a desalted cake forming step of dehydrating the slurry from which the chlorine has been eluted to obtain a first desalted cake and a first filtrate;
A first desalted filter cake washing step of washing the first desalted filter cake with a second desalting washing liquid different from the first desalting washing liquid to obtain a second desalted filter cake and a second filtrate; and
A second desalted cake washing step of washing the second desalted cake with a third desalting washing liquid different from the first desalting washing liquid and the second desalting washing liquid to obtain a third desalted cake and a third filtrate,
Repeating the slurrying step, the chlorine dissolving step, the desalted cake forming step, the first desalted cake washing step, and the second desalted cake washing step for each chlorine-containing powder supplied, recovering and storing at least a part of the third filtrate obtained in the second desalted cake washing step, reusing the recovered filtrate as the second desalting cleaning liquid for the first desalted cake washing step, the third desalting cleaning liquid for the second desalted cake washing step, or both, which correspond to chlorine-containing powder supplied to a subsequent stage, recycling the recovered filtrate one or more times, recycling the recovered filtrate as the first desalting cleaning liquid,
And, by performing the desalted cake forming step, the first desalted cake washing step, and the second desalted cake washing step by a solid-liquid separator using a filter cloth, at least a part of the filter cloth washing wastewater obtained when washing the filter cloth is recycled as the first desalting washing liquid.
[ Modified ] the method for desalting chlorine-containing powder according to claim 4, wherein at least a part of the filter cloth washing wastewater obtained when washing the filter cloth is recycled as the second desalting washing liquid, the third desalting washing liquid or both.
[ Modified ] the method for desalting chlorine-containing powder according to claim 4 or 5, wherein the solid-liquid separation device is a filter press or a belt filter.
[ Modified ] the method for desalting chlorine-containing powder according to claim 4 or 5, wherein the solid-liquid separation device is a filter press, at least a part of the filter cloth washing wastewater is subjected to solid-liquid separation, and a liquid portion thereof is recycled as the second desalting washing liquid, the third desalting washing liquid, or both.
[ Modified ] the method for desalting chlorine-containing powder according to any one of claims 1 to 7, wherein, when reusing the third filtrate obtained in the second cake washing step, at least a part of the third filtrate is recovered and stored in a storage tank, any one or more of the following (1) to (5) is observed to determine whether the reuse is possible,
(1) Total time of the reuse treatment of the third filtrate
(2) The total water amount of the third filtrate subjected to the recycling treatment
(3) The pH of the third filtrate
(4) Chloride ion concentration of the third filtrate
(5) The conductivity of the third filtrate.
[ Modified ] the method for desalting chlorine-containing powder according to any one of claims 1 to 8, wherein at least a part of the second filtrate obtained in the first cake-washing step is recovered and stored, and reused as the second desalting cleaning liquid for the first cake-washing step corresponding to chlorine-containing powder supplied to a subsequent stage, and after one or more times of reuse thereof, recycled as the first desalting cleaning liquid.
[ Modified ] the method for desalting chlorine-containing powder according to claim 9, wherein, when the second filtrate obtained in the first desalted cake washing step is reused, at least a part of the second filtrate is recovered and stored in a storage tank, and any one or more of the following (1) to (5) is observed to determine whether the reuse is possible,
(1) Total time of the second filtrate to be reused
(2) The total water content of the second filtrate is reused
(3) The pH of the second filtrate
(4) Concentration of chloride ions in the second filtrate
(5) The conductivity of the second filtrate.
[ Increasing ] the method for desalting chlorine-containing powder according to any one of claims 1 to 10, wherein the washing of the first desalted cake with the second desalting washing liquid in the first desalted cake washing step is performed a plurality of times, and/or
And washing the second desalted cake with the third desalting washing liquid in the second desalted cake washing step a plurality of times.
[ Increasing ] the method for desalting chlorine-containing powder according to any one of claims 1 to 11, wherein the water consumption is 1.5 to 4 parts by mass per 1 part by mass of the dry weight of the chlorine-containing powder subjected to the desalting treatment.
[ Increasing ] the method for desalting chlorine-containing powder according to any one of claims 1 to 12, wherein the desalted cake forming step, the first desalted cake washing step and the second desalted cake washing step are performed by one solid-liquid separation apparatus.
Claims (11)
1. A method for desalting chlorine-containing powder, comprising:
a slurrying step of mixing a chlorine-containing powder with a first desalting cleaning liquid to prepare a slurry;
a chlorine dissolving step of dissolving chlorine contained in the chlorine-containing powder into a liquid phase in the slurry;
a desalted cake forming step of dehydrating the slurry from which the chlorine has been eluted to obtain a first desalted cake and a first filtrate;
A first desalted filter cake washing step of washing the first desalted filter cake with a second desalting washing liquid different from the first desalting washing liquid to obtain a second desalted filter cake and a second filtrate; and
A second desalted cake washing step of washing the second desalted cake with a third desalting washing liquid different from the first desalting washing liquid and the second desalting washing liquid to obtain a third desalted cake and a third filtrate,
And repeating the slurrying step, the chlorine dissolving step, the desalted cake forming step, the first desalted cake washing step, and the second desalted cake washing step for each chlorine-containing powder supplied, recovering and storing at least a part of the third filtrate obtained in the second desalted cake washing step, and reusing the recovered filtrate as the second desalting cleaning liquid for the first desalted cake washing step, the third desalting cleaning liquid for the second desalted cake washing step, or both, which corresponds to the chlorine-containing powder supplied to a subsequent stage, and recycling the recovered filtrate as the first desalting cleaning liquid after one or more times.
2. The method for desalting chlorine-containing powder according to claim 1, wherein,
And performing the desalted cake forming step, the first desalted cake washing step, and the second desalted cake washing step by using a solid-liquid separator of a filter cloth, and recycling at least a part of filter cloth washing wastewater obtained when washing the filter cloth as the second desalting washing liquid, the third desalting washing liquid, or both.
3. The method for desalting chlorine-containing powder according to claim 2, wherein said solid-liquid separation device is a filter press or a belt filter.
4. The method for desalting chlorine-containing powder according to claim 2, wherein said solid-liquid separation device is a filter press, at least a part of said filter cloth washing wastewater is subjected to solid-liquid separation, and a liquid portion thereof is recycled as said second desalting washing liquid, said third desalting washing liquid or both.
5. The method for desalting chlorine-containing powder according to any one of claims 1 to 4, wherein at least a part of filter cloth washing wastewater obtained when washing the filter cloth is recycled as the first desalting washing liquid by performing the desalted cake forming step, the first desalted cake washing step, and the second desalted cake washing step by a solid-liquid separator of the filter cloth.
6. The method for desalting chlorine containing powder according to any one of claims 1 to 5, wherein, when recycling the third filtrate obtained in the second cake washing step, it is determined whether or not the recycling is possible by observing any one or more of the following (1) to (5) in a storage tank in which at least a part of the third filtrate is recovered and stored,
(1) Total time of the reuse treatment of the third filtrate
(2) The total water amount of the third filtrate subjected to the recycling treatment
(3) The pH of the third filtrate
(4) Chloride ion concentration of the third filtrate
(5) The conductivity of the third filtrate.
7. The method for desalting chlorine-containing powder according to any one of claims 1 to 6, wherein at least a part of the second filtrate obtained in the first cake-washing step is recovered and stored and reused as the second desalting cleaning liquid for the first cake-washing step corresponding to chlorine-containing powder supplied to a subsequent stage, and after one or more times of reuse thereof, the second filtrate is recycled as the first desalting cleaning liquid.
8. The method for desalting chlorine-containing powder according to claim 7, wherein, when recycling the second filtrate obtained in the first desalted cake washing step, at least a part of the second filtrate is recovered and stored in a storage tank, and any one or more of the following (1) to (5) is observed to determine whether the recycling is possible,
(1) Total time of the second filtrate to be reused
(2) The total water content of the second filtrate is reused
(3) The pH of the second filtrate
(4) Concentration of chloride ions in the second filtrate
(5) The conductivity of the second filtrate.
9. The method for desalting chlorine-containing powder according to any one of claims 1 to 8, wherein,
Washing the first desalted cake with the second desalting washing liquid in the first desalted cake washing step a plurality of times, and/or
And washing the second desalted cake with the third desalting washing liquid in the second desalted cake washing step a plurality of times.
10. The method for desalting chlorine-containing powder as claimed in any one of claims 1 to 9, wherein the water amount is 1.5 to 4 parts by mass based on 1 part by mass of the dry weight of the chlorine-containing powder subjected to the desalting treatment.
11. The method for desalting chlorine-containing powder according to any one of claims 1 to 10, wherein the desalted cake forming step, the first desalted cake washing step and the second desalted cake washing step are performed by one solid-liquid separation apparatus.
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| JP2021194535A JP7237133B1 (en) | 2021-11-30 | 2021-11-30 | Method for desalting chlorine-containing powder |
| JP2021-194535 | 2021-11-30 | ||
| PCT/JP2022/039835 WO2023100541A1 (en) | 2021-11-30 | 2022-10-26 | Method for desalting treatment of chlorine-containing powder |
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| JP5481034B2 (en) | 2007-03-27 | 2014-04-23 | 株式会社クボタ | Incineration ash treatment method and incineration ash treatment equipment |
| JP5222519B2 (en) * | 2007-10-04 | 2013-06-26 | 三菱重工環境・化学エンジニアリング株式会社 | Incineration ash washing method and system |
| JP2013095605A (en) * | 2011-10-28 | 2013-05-20 | Tokuyama Corp | Incineration ash treatment method |
| KR102576793B1 (en) | 2018-09-10 | 2023-09-08 | 다이헤이요 세멘토 가부시키가이샤 | Water washing treatment method for chlorine-containing powder and water washing treatment system for chlorine-containing powder |
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2021
- 2021-11-30 JP JP2021194535A patent/JP7237133B1/en active Active
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2022
- 2022-10-26 CN CN202280065923.8A patent/CN118019598A/en active Pending
- 2022-10-26 WO PCT/JP2022/039835 patent/WO2023100541A1/en active Application Filing
- 2022-10-26 KR KR1020247004884A patent/KR20240023704A/en active Search and Examination
- 2022-11-09 TW TW111142726A patent/TW202337562A/en unknown
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003290736A (en) * | 2002-03-29 | 2003-10-14 | Dowa Mining Co Ltd | Method of treating fly ash |
| JP2005246295A (en) * | 2004-03-05 | 2005-09-15 | Mitsubishi Heavy Ind Ltd | Apparatus and method for treating incineration ash |
| CN106391663A (en) * | 2016-11-03 | 2017-02-15 | 湖州森诺环境科技有限公司 | Flying ash harmless treatment resource recycling utilization device and treatment method |
| CN111050933A (en) * | 2018-03-23 | 2020-04-21 | 太平洋水泥株式会社 | Method for desalting chlorine-containing powder and apparatus for desalting chlorine-containing powder |
Also Published As
| Publication number | Publication date |
|---|---|
| TW202337562A (en) | 2023-10-01 |
| WO2023100541A1 (en) | 2023-06-08 |
| KR20240023704A (en) | 2024-02-22 |
| JP2023080949A (en) | 2023-06-09 |
| JP7237133B1 (en) | 2023-03-10 |
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