CN113477680A - Environment-friendly dechlorination method for chlorine-containing dedusting ash - Google Patents
Environment-friendly dechlorination method for chlorine-containing dedusting ash Download PDFInfo
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- CN113477680A CN113477680A CN202110817383.1A CN202110817383A CN113477680A CN 113477680 A CN113477680 A CN 113477680A CN 202110817383 A CN202110817383 A CN 202110817383A CN 113477680 A CN113477680 A CN 113477680A
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- 239000000460 chlorine Substances 0.000 title claims abstract description 73
- 229910052801 chlorine Inorganic materials 0.000 title claims abstract description 73
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000006298 dechlorination reaction Methods 0.000 title claims abstract description 15
- 239000002002 slurry Substances 0.000 claims abstract description 53
- 239000007788 liquid Substances 0.000 claims abstract description 46
- 238000003825 pressing Methods 0.000 claims abstract description 38
- 239000012065 filter cake Substances 0.000 claims abstract description 19
- 238000005406 washing Methods 0.000 claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 21
- 239000012267 brine Substances 0.000 claims description 19
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 19
- 238000005086 pumping Methods 0.000 claims description 15
- 238000003860 storage Methods 0.000 claims description 13
- 150000003839 salts Chemical class 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000000706 filtrate Substances 0.000 claims description 10
- 239000004570 mortar (masonry) Substances 0.000 claims description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 claims description 4
- 229910001385 heavy metal Inorganic materials 0.000 claims description 3
- 239000008235 industrial water Substances 0.000 claims description 3
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 3
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 2
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910001424 calcium ion Inorganic materials 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 239000004571 lime Substances 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 claims description 2
- 239000002956 ash Substances 0.000 abstract description 50
- 238000003756 stirring Methods 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000428 dust Substances 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000010881 fly ash Substances 0.000 abstract description 2
- 238000002386 leaching Methods 0.000 abstract 2
- 241001131796 Botaurus stellaris Species 0.000 abstract 1
- 239000010797 grey water Substances 0.000 abstract 1
- 238000005303 weighing Methods 0.000 abstract 1
- 238000004537 pulping Methods 0.000 description 16
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 238000005245 sintering Methods 0.000 description 8
- 239000004744 fabric Substances 0.000 description 7
- 230000006378 damage Effects 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- 230000005684 electric field Effects 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 150000001805 chlorine compounds Chemical class 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000382 dechlorinating effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000024121 nodulation Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Images
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/12—Filter presses, i.e. of the plate or plate and frame type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to an environment-friendly dechlorination method for chlorine-containing dedusting ash, which comprises two main systems: the method comprises the following steps of receiving and storing chlorine-containing dust removal ash, metering and blanking, stirring and slurrying concentrated solution, adding chemicals into the slurry, stirring and leaching, and performing multistage filter pressing to obtain high-concentration bittern-containing water and low-chlorine mud cakes; the dechlorination system adopted sequentially comprises chlorine-containing ash receiving and storing equipment, weighing and blanking equipment, stirring and slurrying equipment, slurrying liquid caching and heat tracing dosing stirring and leaching equipment, multi-stage filter pressing equipment, filter cake transferring equipment, eluate storing equipment, a matched pump pipe system and the like. The invention can realize the deep removal of CL from chlorine-containing dedusting ash‑Meanwhile, the problem of environmental pollution in the treatment process of the chlorine-containing ash is solved, and the treated ash is free from ash; solves the problem of different chlorine contentsThe economic dechlorination problem of the fly ash; solves the problems of clear liquid blockage and the like in the process of transferring chlorine-containing grey water washing slurry.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to green treatment and cyclic efficient utilization of high-chlorine ash such as sintering electric field ash, blast furnace cloth bag ash and the like in the steel industry, and particularly relates to an environment-friendly dechlorination method for chlorine-containing dedusting ash.
Background
The sources of chloride ions in the steel industry are mainly divided into three types: the chlorine content in the iron-containing mineral powder accounts for the main part, and particularly the chlorine content in the imported mineral powder is higher; secondly, the iron and steel smelting slag is derived from various added solvent minerals in the processes of iron and steel smelting; meanwhile, a part of chloride ions are also brought by various coals and cokes in the smelting process.
The chlorine-containing substances mainly overflow in the form of various chlorides in the high-temperature smelting environment, and most of the chlorine-containing substances are enriched in various smoke dust and coal gas and are circularly enriched inside steel enterprises. The enrichment of such chlorine-containing substances has a bad influence on all the main production processes of the steel industry: firstly, various chlorine-containing dedusting ash blending sintering processes cause bonding and blocking of grate bars of a grate, the utilization coefficient of a sintering machine is greatly reduced, and the product quality is reduced; after the sintered ore with high chlorine content enters an iron-making process, chloride mainly exists in the form of potassium chloride and sodium chloride to bring alkali metal harm to a blast furnace, so that the sintered ore is pulverized, coke is degraded too quickly in an early stage, the air permeability of the blast furnace is reduced, the yield of the blast furnace is influenced slightly, the furnace condition is unsmooth even the nodulation and the corrosion of refractory materials of the blast furnace are caused seriously, and the service life of the blast furnace is shortened greatly; meanwhile, chlorides entering the coal gas have the characteristics of strong corrosivity and easy adhesion and caking, and cause serious damage to equipment in various procedures in the steel industry, such as corrosion of a gas pipeline, a gas boiler, a TRT or BPRT blade, blockage of a boiler tube bundle, unbalance of dynamic balance of TRT or BPRT blade adhesion and the like.
The main types of the chlorine-containing ash of iron and steel enterprises are blast furnace cloth bag ash and sintering electric field ash, wherein the chlorine content of the blast furnace cloth bag ash is generally 6-8%, the chlorine content of the sintering electric field ash is higher, and particularly the chlorine ion content in the sintering 3 and 4 electric field ash can reach 30-40%. At present, the blast furnace cloth bag ash is mainly matched with a sintering process to utilize about 20 percent of carbon element in the blast furnace cloth bag ash, and the treatment mode cannot avoid the harm of chlorine element; the sintering electric field ash is subjected to external treatment, a large amount of treatment cost needs to be paid out when the iron element is lost due to the treatment mode, and the treatment mode cannot be sustained along with the enhancement of the environmental protection management and control force.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the invention provides an environment-friendly dechlorination method for chlorine-containing dedusting ash, which aims to solve the problems of cyclic enrichment and great harm of the chlorine-containing ash in the steel industry.
The technical scheme adopted by the invention for solving the technical problems is as follows: an environment-friendly dechlorination method for chlorine-containing dedusting ash comprises the following steps:
s1, injecting chlorine-containing ash into a chlorine-containing ash bin by using compressed nitrogen;
s2, quantitatively feeding the chlorine-containing ash in the chlorine-containing ash bin into a chlorine-containing mortar slurrying tank through a screw quantitative feeder to form slurry liquid, wherein the solid content of the slurry liquid in the chlorine-containing mortar slurrying tank is controlled to be 20-30%, and the slurry liquid is stirred and aerated in the chlorine-containing mortar slurrying tank for 10-40min and then is pumped into a slurry liquid storage tank with a steam heat tracing function;
s3, pumping the slurry in the slurry storage tank into a first filter press for filter pressing, transferring the high-concentration salt-containing brine after filter pressing into a subsequent evaporation salt separation procedure for treatment through a brine tank, and allowing filter cakes after filter pressing to enter a first slurry barrel for slurry pressing through a first material guide funnel;
s4, pumping the slurry slurried in the first slurrying barrel into a second filter press through a slurry pump, pumping the salt-containing brine generated by filter pressing into a brine buffer tank and then into a chlorine-containing ash slurrying tank through a liquid transfer pump for use, and pumping the filter cake generated by filter pressing of the second filter press into the second slurrying barrel through a second material guide funnel to be mixed with new industrial water and then slurried again;
s5, pumping the slurry slurried in the second slurry barrel into a third filter press through a slurry pump, feeding the filter-pressed filtrate into a filtrate buffer tank, pumping the filtrate into the first slurry barrel through a liquid transfer pump for slurrying a filter cake generated by filter pressing of the first filter press, feeding a machine washing liquid into a machine washing liquid buffer tank, and conveying the filter cake generated by filter pressing of the third filter press into a belt conveyor below the third guide hopper to a subsequent process for treatment.
In the step S2, in order to reduce the difficulty of deep impurity removal of the salt-containing brine in the subsequent salt separation process, sodium carbonate or sodium sulfide is added into the chlorine-containing lime slurrying tank during the slurrying process, so as to promote the sedimentation of calcium and magnesium ions and heavy metal substances.
Further, the temperature of the slurry liquid in the slurry liquid storage tank is controlled to be 50-70 ℃, on one hand, the stability of the temperature of the slurry liquid in different seasons is ensured, and the CL in the slurry liquid is further improved-On the other hand, the damage of overhigh temperature of the slurry liquid to the filter cloth of the subsequent filter press is avoided.
The inner cavities of the first material guide funnel, the second material guide funnel and the third material guide funnel are all provided with metal grids, so that the whole filter cake after filter pressing falls onto the metal grids and is broken into small filter residues.
The invention has the beneficial effects that: the invention can realize deep removal of CL contained in chlorine-containing dedusting ash-Meanwhile, the problem of environmental pollution in the treatment process of the chlorine-containing ash is solved, no ash is found in the treated ash, the economic dechlorination problem of the dedusting ash with different chlorine contents is solved, and the problems of clear liquid blockage and the like in the material transferring process of the chlorine-containing ash water washing slurry are solved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic process flow diagram of the present invention.
In the figure: 1. the device comprises a suction and discharge tank car, 2. a chlorine-containing ash bin, 3. a nitrogen buffer tank, 4. a screw constant feeder, 5. a chlorine-containing ash slurrying tank, 6. a slurrying liquid storage tank, 7. a first filter press, 8. a brine tank, 9. a first material guide funnel, 10. a first slurrying barrel, 11. a second filter press, 12. a brine buffer tank, 13. a second material guide funnel, 14. a second slurrying barrel, 15. a third filter press, 16. a filtrate buffer tank, 17. a machine washing liquid buffer tank, 18. a third material guide funnel and 19. a belt conveyor.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
Fig. 1 shows a process flow diagram of an environment-friendly dechlorination method for chlorine-containing fly ash, which comprises the following specific processes:
after the suction and discharge tank car 1 closely conveys the chlorine-containing ash to the area where the treatment device is located, compressed nitrogen is used for pumping into a chlorine-containing ash bin 2, and a nitrogen buffer tank 3 is arranged for ensuring the stability of the chlorine-containing ash conveying gas.
Quantitatively feeding chlorine-containing ash in the chlorine-containing ash bin 2 into a chlorine-containing ash pulping tank 5 through a screw quantitative feeder 4 to form pulping liquid, controlling the solid content of the pulping liquid in the chlorine-containing ash pulping tank 5 to be 25%, stirring and aerating the pulping liquid in the chlorine-containing ash pulping tank 5 for 30min, and pumping the treated pulping liquid to a pulping liquid storage tank 6 with a heat tracing function through the pulping liquid;
according to the difference of chlorine content of the slurry cached in the slurry storage tank 6, flexible multi-stage rinsing treatment can be performed, and according to the embodiment, the chlorine-containing ash is used as the reference of CL-The content is more than 20 percent, and three-stage rinsing treatment is adopted.
Pumping the slurry in the slurry storage tank 6 into a first filter press 7 for filter pressing, transferring the high-concentration salt-containing brine subjected to filter pressing into a subsequent process for treatment through a lower brine tank 8, and introducing a filter cake subjected to filter pressing into a first slurry barrel 10 for slurry preparation through a first material guide funnel 9, wherein the liquid used for slurry preparation is obtained from a filtrate generated by a subsequent third filter press 15;
slurry slurried in the first slurrying barrel 10 is pumped into a second filter press 11 through a slurry pump, salt-containing brine after filter pressing automatically flows into a brine buffer tank 12 below the second slurrying barrel, the salt-containing brine is pumped into a chlorine-containing ash slurrying tank 5 through a liquid transfer pump for slurrying, and filter cakes generated by filter pressing of the second filter press 11 enter a second slurrying barrel 14 right below the second slurrying barrel through a second material guide funnel 13 to be mixed with new industrial water for repulping again;
the slurrying liquid after slurrying in the second slurrying barrel 14 is pumped into a third filter press 15 through a slurry pump, the filter liquor after filter pressing enters a filtrate buffer tank 16 below the filter liquor after filter pressing and is pumped into a first slurrying barrel 10 through a liquid transfer pump, the filter liquor is used for slurrying filter cakes generated by filter pressing of a first filter press 7, and machine washing filtrate generated after filter pressing enters a machine washing liquid buffer tank 17 due to CL of the machine washing liquid-The lower part of the filter cake is used as machine washing supplementary liquid, the other part of the filter cake is used as filter cake pulp generated after filter pressing of the second filter press 11, and the filter cake generated by the third filter press 15 falls into a belt conveyor 19 below through a third material guide funnel 18 to be conveyed to a next procedure for treatment.
All possess the stirring function in above-mentioned chlorine ash slurrying jar 5, first slurrying bucket 10 and the second slurrying bucket 14, wherein chlorine ash slurrying jar 5 still possesses the function of adding sodium carbonate or sodium sulfide rinsing agent at the slurrying in-process to promote the subsidence of calcium magnesium ion, heavy metal matter, reduce the processing degree of difficulty that contains the salt brine degree of depth edulcoration.
The pulping liquid storage tank 6 with a proper volume is arranged before chlorine-containing mortar enters a filter pressing system after being pulped, the pulping liquid storage tank is matched with the model of a subsequent filter press, the flexible connection of the chlorine-containing mortar pulping process and the filter pressing process is ensured, the pulping liquid storage tank 6 is provided with a steam heat tracing function besides a conventional stirring function, the temperature of the pulping liquid can be controlled to be about 50-70 ℃ in the production process, on one hand, the stability of the temperature of the pulping liquid in different seasons is ensured, and the CL in the pulping liquid is further improved-On the other hand, the damage of overhigh temperature of the slurry liquid to the filter cloth of the subsequent filter press can be avoided.
First guide funnel 9, second guide funnel 13 and third guide funnel 18 all set up metal grating on their inside cavity wall except that embedded self-lubricating macromolecular material to make the monoblock filter cake after the filter-pressing fall and break into the fritter filter residue on the metal grating, guarantee this system's slurrying effect and follow-up belt transportation.
The dechlorination method is based on the CL in the chlorine-containing ash-The content is high and low, different pipelines can be selected to select first-stage washing, second-stage washing or third-stage washing, the first filter press 7, the second filter press 11 and the third filter press 15 used in the system all adopt plate and frame filter presses, and the last-stage filter press is the filter pressThe third filter press 15 has a belt washing function to ensure CL in the filter cake-The content meets the requirements of production indexes of the next procedure; the system can reach washing and dechlorinating effects on the dedusting ash with high chlorine content through multi-stage concentration slurrying and filter pressing procedures, and meanwhile, the CL is performed on the dedusting ash-The consumption of new water for each ton of chlorine-containing ash with the content of about 30-35 percent can be controlled to be 2.4-2.8t, and the water resource is saved.
The first filter press 7, the first material guide funnel 9, the first slurry barrel 10, the second filter press 11, the second material guide funnel 13, the second slurry barrel 14, the third filter press 15, the third material guide funnel 18 and the belt conveyor 19 are all vertically arranged according to a three-layer structure; the filter-pressing back filtrating of first pressure filter 7 flows automatically and gets into brine jar 8, and 11 filter-pressing back filtrating flows automatically and gets into brine buffer tank 12 of second pressure filter, and 15 filter-pressing back filtrating flows automatically and gets into filtrating buffer tank 16 and machine washing liquid buffer tank 17, can reduce the pump sending of filtrating through complicated pipeline from this, especially can effectively avoid filter-pressing back filtrating pipeline's jam problem under the circumstances of the damaged hourglass mud appears in the filter press filter bag.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. An environment-friendly dechlorination method of chlorine-containing dedusting ash is characterized by comprising the following steps: the method comprises the following steps:
s1, injecting chlorine-containing ash into a chlorine-containing ash bin by using compressed nitrogen;
s2, quantitatively feeding the chlorine-containing ash in the chlorine-containing ash bin into a chlorine-containing mortar slurrying tank through a screw quantitative feeder to form slurry liquid, wherein the solid content of the slurry liquid in the chlorine-containing mortar slurrying tank is controlled to be 20-30%, and the slurry liquid is stirred and aerated in the chlorine-containing mortar slurrying tank for 10-40min and then is pumped into a slurry liquid storage tank with a steam heat tracing function;
s3, pumping the slurry in the slurry storage tank into a first filter press for filter pressing, transferring the high-concentration salt-containing brine after filter pressing into a subsequent evaporation salt separation procedure for treatment through a brine tank, and allowing filter cakes after filter pressing to enter a first slurry barrel for slurry pressing through a first material guide funnel;
s4, pumping the slurry slurried in the first slurrying barrel into a second filter press through a slurry pump, pumping the salt-containing brine generated by filter pressing into a brine buffer tank and then into a chlorine-containing ash slurrying tank through a liquid transfer pump for use, and pumping the filter cake generated by filter pressing of the second filter press into the second slurrying barrel through a second material guide funnel to be mixed with new industrial water and then slurried again;
s5, pumping the slurry slurried in the second slurry barrel into a third filter press through a slurry pump, feeding the filter-pressed filtrate into a filtrate buffer tank, pumping the filtrate into the first slurry barrel through a liquid transfer pump for slurrying a filter cake generated by filter pressing of the first filter press, feeding a machine washing liquid into a machine washing liquid buffer tank, and conveying the filter cake generated by filter pressing of the third filter press into a belt conveyor below the third guide hopper to a subsequent process for treatment.
2. The environmental protection dechlorination method of chlorine-containing dedusting ash as claimed in claim 1 is characterized in that: in step S2, sodium carbonate or sodium sulfide is added into the chlorine-containing lime slurry tank during the slurry process to promote the sedimentation of calcium and magnesium ions and heavy metal substances.
3. The environmental protection dechlorination method of chlorine-containing dedusting ash as claimed in claim 1 is characterized in that: in step S2, the temperature of the slurry in the slurry storage tank is controlled to be 50-70 ℃.
4. The environmental protection dechlorination method of chlorine-containing dedusting ash as claimed in claim 1 is characterized in that: the inner cavities of the first material guide funnel, the second material guide funnel and the third material guide funnel are all provided with metal grids, so that the whole filter cake after filter pressing falls onto the metal grids and is broken into small filter residues.
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