JP4948429B2 - Processing system for combustible waste containing metals and chlorine - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a combustible waste treatment system containing metals and chlorine, and more particularly to a system for recycling a waste vehicle using shredder dust for cement production.

  Conventionally, discarded vehicles and the like are recycled at a steel recycling plant after being finely cut with a large cutter such as a shredder, and then separating and recovering valuable materials such as iron and non-ferrous metals through a magnetic separator and a specific gravity separator. However, at that time, debris-like residue (shredder dust) called ASR (Automobile Shredder Residues) is generated, and the treatment becomes a problem. These are mainly landfilled at the final disposal site. In recent years, the remaining amount of the final disposal site has become tight, and it has become difficult to secure a new disposal site. There is also a problem that the residual metals in the leaching into the landfill treatment site contaminate the environment.

  Therefore, as a technique for processing ASR by a method other than landfill, for example, Patent Document 1 discloses that ASR is recycled for cement production by adding finely crushed ASR to a cement raw material and putting it into a cement kiln. A processing method has been proposed.

  On the other hand, in cement production, lead in cement has been regarded as a problem in recent years, and a movement to regulate the upper limit of lead concentration has started. Conventionally, it has been thought that lead in cement is fixed and hardly dissolved or contaminated in the soil. However, as the amount of recycled resources used in cement production equipment has increased in recent years, the amount of lead in cement has increased. As a result, the risk of soil contamination has become a concern.

  Therefore, as a technique for reducing the lead concentration in cement, for example, Patent Document 2 discloses chlorine bypass dust and the like in order to effectively separate and remove chlorine and lead in waste supplied to the cement manufacturing process. A water washing step for washing the waste water, an alkali elution step for the solid matter separated by filtration, a deleading step for precipitating and separating lead from the filtrate, and a decalcification for precipitating and separating calcium from the deleaded filtrate There is disclosed a waste processing method including a process and a salt recovery process in which the filtrate is heated to precipitate a chloride to separate and recover.

  Further, in Patent Document 3, in separating and removing lead and the like from waste such as fly ash, a solution containing calcium ions is mixed to obtain a slurry, followed by solid-liquid separation and solid content containing zinc. And a process for obtaining an aqueous solution containing lead, and a process for adding a sulfurizing agent to the aqueous solution containing lead, followed by solid-liquid separation to obtain a solution containing lead sulfide and calcium ions, etc. A method is described.

JP-A-9-86977 JP 2003-1218 A JP 2003-201524 A

  However, in the prior arts described in Patent Documents 2 and 3, lead contained in chlorine bypass dust or the like is removed, but the proportion of lead removed from the system from chlorine bypass dust is 30% of the total. Even if 100% of lead in chlorine bypass dust is removed, the remaining 70% is still taken up by the clinker discharged from the cement kiln, so the lead content of the cement is reduced. Is not easy. Therefore, it is important to promote the volatilization of lead in the cement kiln and increase the concentration ratio of lead into chlorine bypass dust.

  On the other hand, according to the prior art described in Patent Document 1, although ASR can be effectively used as a resource, when lead is contained in residual heavy metals in ASR, the lead content of cement is increased. In addition, chlorine contained in ASR may also affect cement quality. For this reason, even if ASR is added to the cement raw material and used for cement production, there is a problem that the amount of ASR used must be limited and it cannot be efficiently processed.

  Therefore, the present invention has been made in view of the above-described problems in the prior art, and efficiently recycles combustible waste containing metals such as ASR and chlorine, and in the cement kiln. The purpose is to reduce the content of heavy metals in cement by promoting volatilization of heavy metals such as lead and increasing the concentration of heavy metals in chlorine bypass dust.

In order to achieve the above object, the present invention provides a combustible waste treatment system containing metals and chlorine, the combustible waste containing metals and chlorine, or a predetermined amount from the combustible waste. Crushing means for pulverizing combustible matter obtained by removing foreign matters including metal, flammable waste before being pulverized by the pulverizing means, or flammable waste after being pulverized by the pulverizing means, a predetermined metal a foreign matter removing means for obtaining a combustible fraction to remove foreign matter including, said grinding means and the foreign substance removing means through-obtained combustibles particle size of 1mm or more, and a particle size adjusting means for adjusting the 50mm or less, the particle size And a charging means for charging the combustible component containing chlorine whose particle size is adjusted by the adjusting means into a cement firing furnace, the charging means being a kiln front part, kiln bottom part, kiln body part or calcining part of a cement kiln. Said chlorine from the furnace The combustible component is charged, and the combustible component is burned in the region from the kiln bottom of the cement kiln to the calciner outlet, and the CO concentration of the combustion gas in the kiln bottom of the cement kiln is 0.2% or more , 5% or less, and the chlorine concentration in the cement material in該窯buttocks is 50ppm or more, and that you adjust the input amount of the combustible fraction containing the chlorine at 3% or less.

According to the present invention, the combustible matter obtained through the pulverizing means and the foreign matter removing means is not only used as a fuel substitute by putting it into a cement firing furnace, but also contains chlorine contained in the combustible content. By reacting with heavy metals such as lead in cement kilns, etc., heavy metals can be volatilized efficiently. In addition, by burning the combustible component containing chlorine in a cement kiln or the like, a reducing atmosphere can be generated in the cement kiln or the like, and heavy metals can be efficiently volatilized under the reducing atmosphere. Since the volatilized heavy metals are discharged out of the system in a concentrated state, the removal rate of heavy metals from a cement kiln or the like can be increased. In addition, the amount of waste that can be treated can be increased compared to the conventional method. Therefore, it is possible to reduce the content of heavy metals in cement while efficiently recycling combustible waste containing metals and chlorine. It becomes possible.

By using a combustible fraction containing the particle size adjusted chlorine, it is possible to obtain a uniform combustion state of the combustible component, it becomes easy to burn combustibles in the desired position in cement kilns, more efficiently Heavy metals can be volatilized.

Region from kiln of cell Mentokirun to the calciner outlet, the combustion gas temperature of the cement kiln is 700 to 1200 ° C., by reacting the heavy metals chlorine and lead or the like contained in the combustibles, Heavy metals can be efficiently volatilized, and by making this region a reducing atmosphere, it can be volatilized at a higher volatilization rate, and the removal rate of heavy metals in cement can be further increased.

  In the treatment system, the combustible component can be blown at a speed of 0.1 m / s or more and 50 m / s or less by the charging means.

  Moreover, in the said processing system, the said combustible waste can be made into the shredder dust of a disposal vehicle, and it becomes possible to reduce the heavy metal content rate of cement, simultaneously incinerating a shredder dust.

  As described above, according to the present invention, while efficiently recycling the combustible waste containing metals and chlorine, volatilization of heavy metals such as lead in the cement kiln is promoted, chlorine bypass dust, etc. By increasing the concentration ratio of heavy metals in the cement, it is possible to reduce the heavy metal content of the cement.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following explanation, ASR is treated using the combustible waste treatment system containing metals and chlorine according to the present invention, and at the same time, the volatilization of lead in the cement kiln is promoted, and chlorine bypass dust, etc. An example will be described in which the lead content of cement is reduced by increasing the lead concentration ratio.

  FIG. 1 shows a first embodiment of a treatment system for combustible waste containing metals and chlorine according to the present invention. The processing system 1 includes a dry cleaning apparatus 2 that dry-cleans ASR and separates the deposit W1 from the ASR, an eddy current sorter 3 that sorts and recovers copper from the deposit W1 separated by the dry cleaning apparatus 2, and The primary crusher 4 that crushes the washed product (combustible matter) W2 from which the deposit W1 has been removed, the universal crusher 5 that crushes the crushed material W4 from the primary crusher 4, and the dust W3 from the eddy current sorter 3 And an injection nozzle 10 for injecting a mixture W6 of the pulverized product W5 from the universal pulverizer 5 into the cement kiln 11 as a fuel, and a kiln exhaust gas flow from the kiln bottom 11a of the cement kiln 11 to the lowermost cyclone of the preheater 12 Chlorine bypass facility 13 for extracting part of the combustion gas from the road, a classifier 14 for recovering coarse dust from the extracted gas G, and for recovering fine dust discharged from the classifier 14 It consists of the dust collector 15. The primary crusher 4 and the universal crusher 5 can be fitted with a punching screen (punching metal) at the discharge part, and can be adjusted so as to obtain a crushed material having a desired particle size.

  In the processing system 1, when ASR is brought into a cement manufacturing plant, first, the deposit W1 is removed from the ASR by the dry cleaning device 2, and valuable metals such as copper contained in the deposit W1 by the eddy current sorter 3 are used. Recover. The dust (combustible component) W3 discharged from the eddy current sorter 3 is mixed with the pulverized product W5 from the universal pulverizer 5.

  The ASR from which the deposit W1 has been removed by the dry cleaning apparatus 2, that is, the combustible component W2, is crushed by the primary crusher 4 to obtain a crushed product W4, and the crushed product W4 is crushed by the universal pulverizer 5 to obtain a crushed product W5. The pulverized product W5 is mixed with dust (combustible material) W3 discharged from the eddy current sorter 3.

  A mixture W6 of the pulverized material W5 and dust (combustible material) W3 discharged from the eddy current sorter 3 is blown into the cement kiln 11 from the kiln front portion 11b by the blowing nozzle 10 together with the primary air.

  CO is generated by the combustion of the mixture W6, and the inside of the cement kiln 11 becomes a reducing atmosphere. At that time, chlorine contained in the mixture W6 reacts with lead contained in the cement raw material in the cement kiln 11 to cause chloride. Lead is produced. Also, lead that could not be volatilized with lead chloride volatilizes with lead sulfide or the like by forming a reducing atmosphere. In particular, when the ambient temperature is 900 to 1200 ° C., lead chloride exhibits a high volatility (melting point: 501 ° C., boiling point: 950 ° C.), and lead sulfide or the like is highly volatile at 900 to 1200 ° C. in a reducing atmosphere. Can be volatilized at a rate. In addition, the site | part which burns the mixture 6 is not restricted to the cement kiln 11 but may be in a calcining furnace.

  Lead volatilized in the cement kiln 11 or the like moves to the preheater 12 side together with the combustion gas, and is extracted by the chlorine bypass facility 13. Thereafter, the coarse dust in the extraction gas G is recovered by the classifier 14 and returned to the cement kiln 11 system, and the fine dust in the extraction gas G is recovered by the dust collector 15. In this fine powder dust, the amount of lead volatilized in the cement kiln 11 and the like is concentrated more than before, so by collecting this lead, the lead content of the cement manufactured by the cement kiln 11 is contained. The rate can be reduced.

  The amount of the mixture W6 input to the cement kiln 11 is such that the CO concentration of the combustion gas in the kiln bottom portion 11a of the cement kiln 11 is within a range of 0.2 to 5% in order to promote the volatilization of lead. It is preferable to adjust so that the chlorine concentration in the cement raw material in the kiln bottom part 11a is 50 ppm to 3% or less.

  As described above, in this embodiment, by introducing the combustible component of ASR into the cement kiln 11, the chlorine contained in the combustible component is reacted with the lead contained in the cement raw material such as the cement kiln 11 to lead chloride. In order to volatilize lead that could not be volatilized with lead chloride by using a combustible component as a CO generation source, that is, by forming a reducing atmosphere, and lead volatilize with lead sulfide, etc., lead in cement kiln 11 Can increase the volatilization rate. Since the volatilized lead is discharged out of the system in a concentrated state through the chlorine bypass facility 13, the removal rate of lead from the cement kiln 11 can be increased. Moreover, since the usage-amount of ASR can also be increased compared with the past, it becomes possible to reduce the lead content of cement, while recycling ASR efficiently.

  In the above embodiment, the mixture W6 is blown into the cement kiln 11 from the kiln front portion 11b of the cement kiln 11, but as shown in FIG. The mixture W6 may be blown into the calcining furnace 16 by the nozzle 17. Moreover, according to the particle size and blowing location of the mixture W6, the blowing speed of the mixture W6 from the blowing nozzle 17 is adjusted to 0.1-50 m / s.

  Furthermore, a device for charging and blowing the mixture W6 is provided at any one of the kiln front portion 11b, the kiln butt portion 11a, or the trunk portion 11c of the cement kiln 11 shown in FIG. You may supply directly in the cement kiln 11. FIG. Even when the mixture W6 is charged into the calcining furnace 16, a device for charging the mixture W6 may be provided instead of the blowing nozzle 17 of FIG.

  Next, a second embodiment of the processing system for combustible waste containing metals and chlorine according to the present invention will be described with reference to FIG. In this figure, the same components as those of the processing system 1 of FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

  As shown in the figure, this processing system 20 includes a rotor impact mill 21 for pulverizing ASR, a trommel 22 with a suction nozzle for sieving the pulverized ASR, and a combustible material from the gas discharged from the trommel 22. And a cyclone 23 for recovering. In addition, the structure for blowing the combustible part (hereinafter referred to as “grain preparation”) W8 of the ASR whose particle size is adjusted into the cement kiln 11 and the structure for discharging the lead in the cement kiln 11 out of the system are shown in FIG. This is the same as the processing system 1 in FIG.

  The rotor impact mill 21 is an alternative facility for the primary crusher 4 and the universal crusher 5 shown in FIG. 1 and is provided for finely crushing the ASR brought into the cement factory. Further, the trommel 22 with the suction nozzle includes a pulverized product W7 pulverized by the rotor impact mill 21, a pulverized product (grained product) W8 having a predetermined particle size or less, a pulverized product W9 having a predetermined particle size or more, and copper. The blow nozzle 22a and the suction nozzle 22b for discharging the pulverized product W9 and supplying it to the cyclone 23 are provided at the end on the discharge port side. Is done. The cyclone 23 is provided to remove gas components from the air containing the pulverized material W <b> 9 conveyed through both nozzles 22 a and 22 b and return the combustible component W <b> 10 to the rotor impact mill 21.

  In the above processing system 20, a cement kiln through the blowing nozzle 10 is used to prepare the granular material W8 obtained by adjusting the combustible amount of ASR to a predetermined particle size (1 to 50 mm) by the rotor impact mill 21 and the trommel 22 with the nozzle. 11 is blown at a blowing speed of 0.1 to 50 m / s, and chlorine in the grain preparation W8 is reacted with lead contained in a cement raw material such as cement kiln 11 to generate lead chloride and volatilize it. By using it as a CO source, that is, by forming a reducing atmosphere, lead that could not be volatilized by lead chloride is volatilized by lead sulfide or the like. For this reason, similarly to the processing system 1 of FIG. 1, ASR can be used as a fuel, and at the same time, the volatilization rate of lead in the cement kiln 11 can be increased, and the same effect as that of the first embodiment can be obtained. .

  Next, a third embodiment of the combustible waste treatment system containing metals and chlorine according to the present invention will be described with reference to FIG. In this figure, the same components as those of the processing system 20 of FIG. 3 are denoted by the same reference numerals, and description thereof is omitted.

  As shown in the figure, the processing system 30 is different from the processing system 20 of FIG. 3 in that it includes a wind power sorter 31 and a trommel 32 in place of the trommel 22 and the cyclone 23 with the suction nozzle of FIG.

  The wind power sorter 31 is provided for recovering a heavy material containing valuable metals such as copper from the pulverized material W7 pulverized by the rotor impact mill 21, and the trommel 32 is a pulverized material from which the heavy material has been removed. (Combustible component) W11 is provided to separate the combustible component (granular product) W12 having a predetermined particle size or less and the combustible component W13 having other particle sizes.

  Also in the said processing system 30, after adjusting the combustible part of ASR to a predetermined particle size (1-50 mm), it blows in the cement kiln 11 with the blowing speed of 0.1-50 m / s through the blowing nozzle 10, and is a granular preparation. Lead chloride by reacting chlorine in W12 with lead contained in cement raw materials such as cement kiln 11 to generate and volatilize lead chloride, and to use combustibles as a source of CO, that is, to form a reducing atmosphere. The lead that could not be volatilized in is volatilized with lead sulfide or the like. For this reason, similarly to the processing system 1 of FIG. 1, ASR can be used as a fuel substitute, and at the same time, the lead volatilization rate of the cement kiln 11 can be increased, and the same effects as those of the first and second embodiments can be obtained. be able to.

  Moreover, in the said embodiment, although the case where the ASR was processed using the processing system of the combustible waste containing the metals and chlorine concerning this invention was illustrated, the processing target object of this processing system is ASR. Not limited to, combustible waste containing other metals and chlorine can be treated. In the above embodiment, the case where the lead content of cement is reduced at the same time as processing ASR has been described as an example. In addition to lead, chlorine contained in combustible waste is used and reduced. Other heavy metals whose volatility increases in the atmosphere can also be targeted.

It is a flowchart which shows 1st Embodiment of the processing system of the combustible waste containing metals and chlorine concerning this invention. It is a figure which shows the example of a change of the installation position of the blowing nozzle of FIG. It is a flowchart which shows 2nd Embodiment of the processing system of the combustible waste containing the metals and chlorine concerning this invention. It is a flowchart which shows 3rd Embodiment of the processing system of the combustible waste containing the metals and chlorine concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Processing system of combustible waste containing metals and chlorine 2 Dry cleaning device 3 Eddy current sorter 4 Primary crusher 5 Universal crusher 10 Blow nozzle 11 Cement kiln 11a Kiln bottom part 11b Kiln front part 11c Body part 12 Preheater 13 Chlorine bypass facility 14 Classifier 15 Dust collector 16 Calciner 17 Blowing nozzle 20 Combustible waste treatment system 21 containing metal and chlorine 21 Rotor impact mill 22 Trommel 22a with suction nozzle Blow nozzle 22b Suction nozzle 23 Cyclone 30 Processing system for combustible waste containing metals and chlorine 31 Wind sorter 32 Trommel

Claims (3)

Pulverizing means for pulverizing combustible waste containing metal and chlorine, or combustible matter obtained by removing foreign substances including a predetermined metal from the combustible waste;
Combustible waste before being pulverized by the pulverizing means, or from the flammable waste after being pulverized by the pulverizing means, foreign matter removing means for obtaining a flammable component by removing foreign substances containing a predetermined metal,
Said grinding means and the foreign matter removing the particle size of the combustible fraction obtained via means 1mm or more, and a particle size adjusting means for adjusting the 50mm or less,
A charging means for charging a combustible component containing chlorine whose particle size has been adjusted by the particle size adjusting means into a cement firing furnace ,
The charging means inputs the combustible component containing the chlorine from the front part of the kiln of the cement kiln, the bottom part of the kiln, the body part of the kiln or the calcining furnace, and the calcined part is calcined from the kiln bottom part of the cement kiln. Combusting in the region up to the furnace exit, the CO concentration of the combustion gas in the kiln bottom of the cement kiln is 0.2% or more and 5% or less, and the chlorine concentration in the cement raw material in the kiln bottom is 50 ppm or more, processing system of metals and combustible wastes containing chlorine characterized that you adjust the input amount of the combustible fraction containing the chlorine at 3% or less. The closing means, the combustible fraction of 0.1 m / s or more, the processing system of flammable waste containing metals and chlorine according to claim 1, wherein the blowing at a rate 50 m / s. The said combustible waste is the shredder dust of a disposal vehicle, The processing system of the combustible waste containing metals and chlorine of Claim 1 or 2 characterized by the above-mentioned.

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