CN110935710A - Washing desalination treatment system, method and application of household garbage incineration fly ash - Google Patents
Washing desalination treatment system, method and application of household garbage incineration fly ash Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B2101/00—Type of solid waste
- B09B2101/30—Incineration ashes
Abstract
The invention relates to a washing and desalting treatment system for household garbage incineration fly ash, which comprises a primary washing tank, a dehydrator, a secondary washing tank, a tertiary washing tank, a primary drier, a mixer, a granulator, a secondary drier, a plasma melting system, a physical sedimentation tank, a reaction tank, a chemical sedimentation tank, a filtering tank, an adjusting tank, an evaporation and crystallization device, a clean water tank, a primary dirt filtering tank and a secondary dirt filtering tank. The system organically connects the integrated fly ash washing system with the water treatment system, constructs a comprehensive treatment technology system for washing, desalting and desalting the fly ash from the incineration of the household garbage, fully exerts the unique advantages of washing and dechlorinating on the resource utilization of the fly ash and the recycling of heavy metals, synchronously realizes the high-efficiency removal of pollutants such as chloride ions, heavy metal ions and the like, can reduce the treatment cost of the fly ash and reduce the heavy metal pollution, thereby realizing the harmless and resource utilization of the fly ash, and has low energy consumption, investment and operation cost.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a system, a method and application for washing and desalting treatment of household garbage incineration fly ash.
Background
With the rapid development of social economy, the urbanization process is rapidly promoted, so that the yield of the household garbage is rapidly increased. Until 2010, the number and the processing capacity of household garbage incineration plants show a continuously increasing trend. Under the condition of tightening the policy in 2019, the field of fly ash treatment can be continuously developed at a high speed.
Since the fly ash from incineration of household garbage contains various harmful heavy metal substances and salts such as Cd, Pb, Cu, Zn and Cr with high concentration, which can be leached by water, the fly ash from incineration of household garbage has been definitely specified as hazardous waste in the national records of hazardous waste, i.e. the number is HW18, and the disposal of the fly ash must be strictly performed according to the standard of hazardous waste.
Through searching, the following patent publications related to the patent application of the invention are found:
1. a detoxification grading resource utilization method (CN106282585A) of household garbage incineration fly ash comprises the steps of carrying out washing desalination and dechlorination treatment on the household garbage incineration fly ash, then carrying out acid washing to remove heavy metals, compounding the obtained detoxification fly ash and household garbage incineration bottom ash to prepare a water permeable brick, mixing a washing solution and an acid washing solution, selectively enriching and purifying precious metals by adopting activated carbon, recycling soluble salts in the residual liquid phase, and returning the obtained water treatment solution to the washing step for recycling. The treatment method can effectively remove soluble salts, chlorine elements and heavy metals in the fly ash, wherein the leaching toxicity of the residual heavy metals in the fly ash completely meets the national standard; meanwhile, precious metals and soluble salts in the fly ash are effectively recovered, and the cyclic utilization of waste liquid and active carbon is ensured; the method has the advantages of energy conservation, ecological environmental protection, resource recovery, waste material recycling and the like, and meanwhile, the detoxified fly ash can be safely used in industries such as construction, environmental protection and the like, and has extremely high application and popularization values.
2. A domestic waste burns the wet method mould bag processing method of the fly ash and system (CN106734045A), through fly ash pulping, fly ash slurry transport and fly ash slurry dehydration/hydrate consolidation 3 links, fully and realize the homogenization of fly ash, heavy metal and dioxin detoxify, desalt and form from hydration consolidation at the same time; the fly ash in the solidified die bag body meets the requirements of relevant national standards, the solidified die bag body can be subjected to landfill disposal, and the fly ash can be taken out from the die bag for resource utilization; and (3) naturally evaporating and concentrating the liquid discharged from the mold bag by utilizing the space of a landfill, and recycling the liquid after recovering heavy metals and dioxin, filtering and removing impurities, or further extracting salt and recycling the liquid. The invention also discloses a system for treating the household garbage incineration fly ash by the mould bag method. The method can avoid the defects of the traditional dry landfill of the fly ash and the large-scale industrial application of the water washing pretreatment technology, can realize the integrated treatment of the homogenization, detoxification, desalination, spontaneous hydration consolidation and landfill of the fly ash, lays a foundation for the subsequent resource utilization of the fly ash, has low treatment cost, and can be applied to large-scale industrial production.
3. A method (CN105907981A) for removing heavy metals in municipal refuse incineration fly ash by using bioleaching technology has a main stream disposal process stabilization/solidification landfill cost of 2000-3000 yuan/ton and the environmental risk of toxic metals still exists. The removal of toxic metals from fly ash is a prerequisite for its low/unlimited resource utilization. The invention takes cheap inorganic energy substrates such as sulfur and the like as working media, and realizes the high-efficiency, green and safe leaching of toxic metals in fly ash under the conditions of normal temperature and normal pressure through the direct/indirect action of the autotrophic leaching microbial inoculum; and through the steps of removing salt and alkali by washing, compounding strains and breeding high-salt-tolerance strains, the biological regeneration performance of leachate is obviously improved, and the circulating leaching times are greatly increased, so that the consumption of inorganic salt culture solution in the leaching process is greatly reduced, and the bioleaching cost is further reduced. The detoxified fly ash is used for resource utilization of bricks, roadbeds, concrete and the like, saves the high cost of the traditional landfill process and eliminates the potential environmental risk.
By contrast, the present patent application is substantially different from the above patent publications.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system, a method and application for washing and desalting fly ash generated by burning household garbage.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the utility model provides a domestic waste burns flying dust washing desalination processing system, the system includes one-level washing jar, hydroextractor, second grade washing jar, tertiary washing jar, one-level mummification machine, mixes machine, granulator, second grade mummification machine, plasma melting system, physics sedimentation tank, retort, chemical precipitation pond, filtration jar, surge tank, evaporation crystallization equipment, clean water basin, one-level filtration jar and second grade filtration jar, one-level washing jar, second grade washing jar, tertiary washing jar, one-level mummification machine are connected the setting in proper order through the hydroextractor, one-level mummification machine, mixing machine, granulator, second grade mummification machine, plasma melting system are connected the setting in proper order, and the input of this one-level washing jar includes flying dust slurry input, eluant input and sewage input, and the input of this mixing machine includes washing back wash ash input, quartz sand input and discarded object input, the input end of the washed elution ash of the mixer is connected with the output end of the primary drier, and quartz sand can be input into the mixer through the input end of the quartz sand;
the physical sedimentation tank, the reaction tank, the chemical sedimentation tank, the filtering tank, the adjusting tank, the evaporative crystallization equipment and the clean water tank are sequentially connected; the input ends of the second-stage water washing tank and the third-stage water washing tank respectively comprise a washed ash-eluting input end and a clean water input end, the output end of the clean water tank is connected with the clean water input ends of the second-stage water washing tank and the third-stage water washing tank, the output end of the evaporative crystallization equipment comprises a clean water output end and an industrial salt output end, the clean water output end of the evaporative crystallization equipment is connected with the input end of the clean water tank, and the industrial salt output end of the evaporative crystallization equipment can output industrial salt after evaporative crystallization; the filtering tank can filter impurities precipitated in the chemical precipitation tank out of water, and the adjusting tank can adjust the pH value of the wastewater;
the output end of the dehydrator comprises a washed ash elution output end and a fly ash eluent output end, the washed ash elution output end of the dehydrator between the first-stage washing tank and the second-stage washing tank is connected with the washed ash elution input end of the second-stage washing tank, and the fly ash eluent output end of the dehydrator is connected with the input end of the physical sedimentation tank; the output end of the fly ash eluent of the dehydrator is connected with the input end of the eluent of the first-level washing tank; the output end of the fly ash eluent of the dehydrator is connected with the input end of the first-level drier, and the output end of the fly ash eluent of the dehydrator is connected with the input end of the eluent of the first-level washing tank;
the output ends of the physical sedimentation tank and the chemical sedimentation tank comprise a treated water output end and a sludge output end, the treated water output end of the physical sedimentation tank is connected with the input end of the reaction tank, and the treated water output end of the chemical sedimentation tank is connected with the input end of the filter tank; the mud output of physics sedimentation tank is connected the setting with the input of one-level dirt straining jar, the mud output of chemistry sedimentation tank is connected the setting with the input of second grade dirt straining jar, and the output of one-level dirt straining jar and second grade dirt straining jar all is connected the setting with the sewage input of one-level washing jar including the discarded object output and the sewage output of heavy metal, the sewage output of one-level dirt straining jar, second grade dirt straining jar, and the discarded object output that contains heavy metal of one-level dirt straining jar, second grade dirt straining jar all is connected the setting with the discarded object input that mixes the machine.
Moreover, the primary drying machine is a dryer.
The application of the household garbage incineration fly ash washing desalination treatment system in the aspect of household garbage incineration fly ash treatment is provided.
The method for treating the household garbage incineration fly ash by using the household garbage incineration fly ash washing and desalting treatment system comprises the following steps:
mixing the household garbage incineration fly ash and deionized water to form fly ash slurry, washing the fly ash slurry through a first-stage washing tank, then performing solid-liquid separation in a dehydrator, washing the eluted ash in a second-stage washing tank for secondary washing, wherein the secondary washing can effectively remove chloride ions in the fly ash, then performing solid-liquid separation in the dehydrator, washing the eluted ash in a third-stage washing tank for third washing, then performing solid-liquid separation in the dehydrator, and ensuring that the effective removal rate of the chloride ions is over 95 percent after the third washing; drying the eluted ash subjected to the three-stage water washing and solid-liquid separation by the washing and dehydrating machine by a primary drying machine and then storing to obtain eluted ash;
the eluent from the dehydrator between the first-stage water washing tank and the second-stage water washing tank contains calcium, magnesium, heavy metal ions and the like and suspended matters, and the heavy metal ions and the calcium and magnesium ions are respectively precipitated through flocculation precipitation of a physical precipitation tank, regulation of a reaction tank, reaction of a chemical precipitation tank and treatment of a filter tank and a regulation tank, so that the fly ash eluent meets the process requirements of an evaporation system; after physical precipitation, adding a chemical reagent into the fly ash eluent to precipitate heavy metal ions and calcium and magnesium ions; carrying out solid-liquid separation on the calcium-magnesium sludge and the sludge containing heavy metals and the returned fly ash washing part continuously; the fly ash water washing liquid enters evaporation crystallization equipment after passing through a plurality of water treatment processes;
the water of the fly ash after washing is high salt water, the components are mainly NaCl and KCl, the crystallization separation of industrial salt is realized after the fly ash enters the evaporation crystallization equipment, and condensed water returns to the second-level water washing tank and the third-level water washing tank through the clean water tank;
the fly ash eluent treated by the dehydrator between the second-stage water washing tank and the third-stage water washing tank and between the third-stage water washing tank and the first-stage drier returns to the first-stage water washing tank for retreatment;
the sludge after the reaction treatment of the physical sedimentation tank and the chemical sedimentation tank enters a sewage filtering tank, the sewage treated by the sewage filtering tank returns to a primary washing tank for retreatment, the waste containing heavy metals, the elution ash and the quartz sand filtered out from the sewage filtering tank are conveyed to a mixer for mixing, the uniformly mixed material enters a granulator for granulation, the granulated material is dried by a secondary drier after being granulated and formed, the dried material enters a plasma melting system for incineration, and finally harmless glass bodies are produced.
The invention has the advantages and positive effects that:
1. the system provided by the invention organically connects the integrated fly ash washing system with the water treatment system, constructs an integrated comprehensive treatment technology system for the elution salt of the incineration fly ash water of the household garbage, fully exerts the unique advantages of washing dechlorination on for fly ash resource utilization and heavy metal recycling, synchronously realizes the high-efficiency removal of pollutants such as chloride ions, heavy metal ions and the like, can reduce the fly ash treatment cost, reduces the heavy metal pollution, further realizes the harmless and resource utilization of the fly ash, and has the advantages of low energy consumption, low investment and low operation cost.
2. The system of the invention utilizes a heavy metal recovery treatment technology taking water treatment as a core, simultaneously realizes a closed path of front-section dechlorination and rear heavy metal recovery, improves the heavy metal solidification rate of the fly ash and reduces the secondary pollution of the fly ash pollutants by means of high-temperature plasma melting equipment, and greatly improves the availability and popularization of the whole system.
3. The system has the advantages of simple structure, convenient use, mild operation condition, low operation cost and high recovery rate.
Drawings
FIG. 1 is a schematic diagram of the structural connection of the system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, which are provided for illustrative purposes only and are not intended to be limiting, and the scope of the present invention should not be limited thereby.
Structures not specifically described in detail herein are to be understood as conventional in the art.
The utility model provides a domestic waste burns flying ash washing desalination processing system, as shown in figure 1, the system includes that one-level washes jar, dehydrator, second grade washing jar, tertiary washing jar, one-level mummification machine, mixer, granulator, second grade mummification machine, plasma melting system, physics sedimentation tank, retort, chemical precipitation pond, filtration jar, surge tank, evaporation crystallization equipment, clean water basin, one-level filth jar and second grade filth jar, one-level washing jar, second grade washing jar, tertiary washing jar, one-level mummification machine are connected gradually the setting through the dehydrator, one-level desiccator, mixer, granulator, second grade mummification machine, plasma melting system connect gradually the setting, and the input of this one-level washing jar includes flying ash slurry input, input and sewage input, and the input of this mixer includes washing back ash input end, ash removal input, The input end of the washed elution ash of the mixer is connected with the output end of the primary drying machine, and the quartz sand can be input into the mixer through the input end of the quartz sand;
the physical sedimentation tank, the reaction tank, the chemical sedimentation tank, the filtering tank, the adjusting tank, the evaporative crystallization equipment and the clean water tank are sequentially connected; the input ends of the second-stage water washing tank and the third-stage water washing tank respectively comprise a washed ash-eluting input end and a clean water input end, the output end of the clean water tank is connected with the clean water input ends of the second-stage water washing tank and the third-stage water washing tank, the output end of the evaporative crystallization equipment comprises a clean water output end and an industrial salt output end, the clean water output end of the evaporative crystallization equipment is connected with the input end of the clean water tank, and the industrial salt output end of the evaporative crystallization equipment can output industrial salt after evaporative crystallization; the filtering tank can filter impurities precipitated in the chemical precipitation tank out of water, and the adjusting tank can adjust the pH value of the wastewater;
the output end of the dehydrator comprises a washed ash elution output end and a fly ash eluent output end, the washed ash elution output end of the dehydrator between the first-stage washing tank and the second-stage washing tank is connected with the washed ash elution input end of the second-stage washing tank, and the fly ash eluent output end of the dehydrator is connected with the input end of the physical sedimentation tank; the output end of the fly ash eluent of the dehydrator is connected with the input end of the eluent of the first-level washing tank; the output end of the fly ash eluent of the dehydrator is connected with the input end of the first-level drier, and the output end of the fly ash eluent of the dehydrator is connected with the input end of the eluent of the first-level washing tank;
the output ends of the physical sedimentation tank and the chemical sedimentation tank comprise a treated water output end and a sludge output end, the treated water output end of the physical sedimentation tank is connected with the input end of the reaction tank, and the treated water output end of the chemical sedimentation tank is connected with the input end of the filter tank; the mud output of physics sedimentation tank is connected the setting with the input of one-level dirt straining jar, the mud output of chemistry sedimentation tank is connected the setting with the input of second grade dirt straining jar, and the output of one-level dirt straining jar and second grade dirt straining jar all is connected the setting with the sewage input of one-level washing jar including the discarded object output and the sewage output of heavy metal, the sewage output of one-level dirt straining jar, second grade dirt straining jar, and the discarded object output that contains heavy metal of one-level dirt straining jar, second grade dirt straining jar all is connected the setting with the discarded object input that mixes the machine.
The function of the filter tank in the system is to filter the impurities which have been precipitated in the previous step and some impurities with smaller particles from the water, so that the water is further purified. The adjusting tank is used for adjusting the pH value of the wastewater.
The method for treating the household garbage incineration fly ash by using the household garbage incineration fly ash washing and desalting treatment system comprises the following steps:
the method comprises the steps of mixing the household garbage incineration fly ash and deionized water to form fly ash slurry, washing the fly ash slurry through a first-stage washing tank, then carrying out solid-liquid separation on the fly ash slurry in a dehydrator, washing the eluted ash in a second-stage washing tank for secondary washing, effectively removing chloride ions in the fly ash through the secondary washing, then carrying out solid-liquid separation on the fly ash slurry in the dehydrator, washing the eluted ash in a third-stage washing tank for tertiary washing, then carrying out solid-liquid separation on the fly ash slurry in the dehydrator, and ensuring that the effective removal rate of the chloride ions is over 95% after the tertiary washing. Drying the eluted ash subjected to the three-stage water washing and solid-liquid separation by the washing and dehydrating machine by a first-stage drier (such as a drier), and storing to obtain eluted ash;
the eluent from the dehydrator between the first-stage water washing tank and the second-stage water washing tank contains calcium, magnesium, heavy metal ions and a small amount of suspended matters, and the heavy metal ions and the calcium and magnesium ions are respectively precipitated through flocculation precipitation of a physical precipitation tank, regulation of a reaction tank, reaction of a chemical precipitation tank and treatment of a filter tank and a regulation tank, so that the fly ash eluent meets the technological requirements of an evaporation system. The fly ash eluent contains chlorine, potassium, sodium and other heavy metal ions, and also contains a small amount of suspended matters. After physical precipitation, chemical reagents are added to precipitate heavy metal ions and calcium and magnesium ions. Calcium-magnesium sludge and a small amount of sludge containing heavy metals return to the fly ash washing part for continuous solid-liquid separation. The water washing liquid of the fly ash enters evaporation crystallization equipment after being subjected to multiple water treatment processes such as physical precipitation, chemical precipitation, multi-stage filtration and the like.
The water of the fly ash after washing is high salt water, the components are mainly NaCl and KCl, the crystallization separation of industrial salt is realized after the fly ash enters the evaporation crystallization equipment, and the condensed water returns to the second-level water washing tank and the third-level water washing tank through the clean water tank.
And the fly ash eluent treated by the dehydrator between the second-stage water washing tank and the third-stage water washing tank and between the third-stage water washing tank and the first-stage drier returns to the first-stage water washing tank for retreatment.
The sludge after the reaction treatment of the physical sedimentation tank and the chemical sedimentation tank enters a sewage filtering tank, the sewage treated by the sewage filtering tank returns to a primary water washing tank for retreatment, the waste containing heavy metals, the elution ash and the quartz sand filtered out from the sewage filtering tank are conveyed to a mixer for mixing, the uniformly mixed material enters a granulator for granulation, the granulated material is dried by a secondary drier after being granulated, the dried material enters a plasma melting system for incineration, and finally harmless glass bodies are produced.
The evaporative crystallization technology used in the invention can be a steam mechanical recompression technology, and the solution circulates in a heating pipe through a material circulating pump in a falling film evaporator. The initial steam is heated outside the pipe by fresh steam, the solution is heated and boiled to generate secondary steam, the generated secondary steam is sucked by a turbine booster fan, and after being boosted, the temperature of the secondary steam is increased and enters a heating chamber as a heating heat source to be circularly evaporated. After the normal start, the turbocompressor sucks in the secondary steam, the secondary steam is changed into heating steam after being pressurized, the cyclic evaporation is continuously carried out on the secondary steam, and evaporated moisture is finally changed into condensed water to be discharged.
Although the embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the embodiments disclosed.
Claims (4)
1. The utility model provides a domestic waste burns flying dust washing desalination processing system which characterized in that: the system comprises a first-stage water washing tank, a dehydrator, a second-stage water washing tank, a third-stage water washing tank, a first-stage drier, a mixing machine, a granulator, a second-stage drier, a plasma melting system, a physical sedimentation tank, a reaction tank, a chemical sedimentation tank, a filtering tank, an adjusting tank, an evaporation crystallization device, a clear water tank, a first-stage filtering tank and a second-stage filtering tank, wherein the first-stage water washing tank, the second-stage water washing tank, the third-stage water washing tank and the first-stage drier are sequentially connected and arranged through the dehydrator, the first-stage drier, the mixing machine, the granulator, the second-stage drier and the melting system are sequentially connected and arranged, the input end of the first-stage water washing tank comprises a fly ash slurry input end, an eluent input end and a sewage input end, the input end of the mixing machine comprises a washed ash washing input end, a quartz sand input end and a, the quartz sand can be input into the mixer through the quartz sand input end;
the physical sedimentation tank, the reaction tank, the chemical sedimentation tank, the filtering tank, the adjusting tank, the evaporative crystallization equipment and the clean water tank are sequentially connected; the input ends of the second-stage water washing tank and the third-stage water washing tank respectively comprise a washed ash-removing input end and a clean water input end, the output end of the clean water tank is connected with the clean water input ends of the second-stage water washing tank and the third-stage water washing tank, the output end of the evaporative crystallization equipment comprises a clean water output end and an industrial salt output end, the clean water output end of the evaporative crystallization equipment is connected with the input end of the clean water tank, and the industrial salt output end of the evaporative crystallization equipment can output industrial salt after evaporative crystallization; the filtering tank can filter the impurities precipitated in the chemical precipitation tank out of the water, and the adjusting tank can adjust the pH value of the wastewater;
the output end of the dehydrator comprises a washed ash elution output end and a fly ash eluent output end, the washed ash elution output end of the dehydrator between the first-stage washing tank and the second-stage washing tank is connected with the washed ash elution input end of the second-stage washing tank, and the fly ash eluent output end of the dehydrator is connected with the input end of the physical sedimentation tank; the output end of the fly ash eluent of the dehydrator is connected with the input end of the eluent of the first-level washing tank; the output end of the fly ash eluent of the dehydrator is connected with the input end of the first-level drier, and the output end of the fly ash eluent of the dehydrator is connected with the input end of the eluent of the first-level washing tank;
the output ends of the physical sedimentation tank and the chemical sedimentation tank comprise a treated water output end and a sludge output end, the treated water output end of the physical sedimentation tank is connected with the input end of the reaction tank, and the treated water output end of the chemical sedimentation tank is connected with the input end of the filter tank; the mud output of physics sedimentation tank is connected the setting with the input of one-level dirt straining jar, the mud output of chemistry sedimentation tank is connected the setting with the input of second grade dirt straining jar, and the output of one-level dirt straining jar and second grade dirt straining jar all is connected the setting including the discarded object output and the sewage output that contain the heavy metal, the sewage output of one-level dirt straining jar, second grade dirt straining jar all is connected the setting with the sewage input of one-level washing jar, and the discarded object output that contains the heavy metal of one-level dirt straining jar, second grade dirt straining jar all is connected the setting with the discarded object input that mixes the machine.
2. The system for water washing and desalting treatment of fly ash from incineration of household garbage as claimed in claim 1, wherein: the primary drying machine is a dryer.
3. Use of the system for water washing and desalting treatment of fly ash from incineration of domestic waste according to claim 1 or 2 in the treatment of fly ash from incineration of domestic waste.
4. The method for treating fly ash from incineration of domestic waste by using the system for water-washing and desalting treatment of fly ash from incineration of domestic waste according to claim 1 or 2, wherein: the method comprises the following steps:
mixing the household garbage incineration fly ash and deionized water to form fly ash slurry, washing the fly ash slurry through a first-stage washing tank, then performing solid-liquid separation in a dehydrator, washing the eluted ash in a second-stage washing tank for secondary washing, wherein the secondary washing can effectively remove chloride ions in the fly ash, then performing solid-liquid separation in the dehydrator, washing the eluted ash in a third-stage washing tank for third washing, then performing solid-liquid separation in the dehydrator, and ensuring that the effective removal rate of the chloride ions is over 95 percent after the third washing; drying the eluted ash subjected to the three-stage water washing and solid-liquid separation by the washing and dehydrating machine by a primary drying machine and then storing to obtain eluted ash;
the eluent from the dehydrator between the first-stage water washing tank and the second-stage water washing tank contains calcium, magnesium, heavy metal ions and suspended matters, and the heavy metal ions and the calcium and magnesium ions are respectively precipitated through flocculation precipitation of a physical precipitation tank, regulation of a reaction tank, reaction of a chemical precipitation tank and treatment of a filter tank and a regulation tank, so that the fly ash eluent meets the process requirements of an evaporation system; after physical precipitation, adding a chemical reagent into the fly ash eluent to precipitate heavy metal ions and calcium and magnesium ions; calcium-magnesium sludge and sludge containing heavy metals and returned fly ash washing part are continuously subjected to solid-liquid separation; the fly ash water washing liquid enters evaporation crystallization equipment after passing through a plurality of water treatment processes;
the water of the fly ash after washing is high salt water, the components are mainly NaCl and KCl, the crystallization separation of industrial salt is realized after the fly ash enters the evaporation crystallization equipment, and condensed water returns to the second-level water washing tank and the third-level water washing tank through the clean water tank;
the fly ash eluent treated by the dehydrator between the second-stage water washing tank and the third-stage water washing tank and between the third-stage water washing tank and the first-stage drier returns to the first-stage water washing tank for retreatment;
the sludge after the reaction treatment of the physical sedimentation tank and the chemical sedimentation tank enters a sewage filtering tank, the sewage treated by the sewage filtering tank returns to a primary washing tank for retreatment, the waste containing heavy metals, the elution ash and the quartz sand filtered out from the sewage filtering tank are conveyed to a mixing machine for mixing, the uniformly mixed material enters a granulating machine for granulation, the granulated material is dried by a secondary drying machine after being granulated and formed, the dried material enters a plasma melting system for incineration, and finally harmless glass bodies are produced.
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| CN112893408A (en) * | 2021-01-20 | 2021-06-04 | 中洁蓝环保科技有限公司 | Method and system for producing salt by washing waste incineration fly ash to remove chlorine |
| CN113105138A (en) * | 2021-04-16 | 2021-07-13 | 北京中科国润环保科技有限公司 | Method and system for water washing dechlorination of waste incineration fly ash and evaporation mass-separation crystallization of water washing liquid |
| CN113245342A (en) * | 2021-04-16 | 2021-08-13 | 北京中科国润环保科技有限公司 | Resource treatment method and system for salt production by washing waste incineration fly ash based on seed crystal method |
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| CN113414222A (en) * | 2021-06-24 | 2021-09-21 | 镇江新区固废处置股份有限公司 | Treatment system and treatment method for household garbage incineration fly ash |
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