CN114602926A - Device and process for resourceful treatment of waste incineration fly ash - Google Patents

Device and process for resourceful treatment of waste incineration fly ash Download PDF

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Publication number
CN114602926A
CN114602926A CN202210214586.6A CN202210214586A CN114602926A CN 114602926 A CN114602926 A CN 114602926A CN 202210214586 A CN202210214586 A CN 202210214586A CN 114602926 A CN114602926 A CN 114602926A
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washing
filtering
filtering device
reaction
water
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李晓清
佟强
范庆来
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Abstract

The invention provides a process for treating flying ash from waste incineration as a resource, which washes out harmful chlorine ions, soluble salts and heavy metals in the flying ash through primary washing, acid washing and secondary washing, the main components of the residual flying ash are silicon dioxide, calcium sulfate and a small amount of dioxin, and the flying ash is treated by high-temperature catalytic oxidation detoxification or cement kiln cooperation, so that the complete harmless treatment of the flying ash is realized; the invention also provides a device for resourceful treatment of waste incineration fly ash, which comprises a first washing and filtering device, a second reaction device, a first acid washing and filtering device and a second washing and filtering device; the whole process of the invention utilizes all the components of the fly ash, achieves the effect of recovering all elements, and has important economic benefit and social benefit.

Description

Device and process for resourceful treatment of waste incineration fly ash
Technical Field
The invention relates to the technical field of environmental protection, in particular to a device and a process for recycling waste incineration fly ash.
Background
With the rapid development of urban economy in China, the urban garbage yield increases day by 8-10% every year. The basic treatment modes of domestic and foreign municipal domestic garbage are landfill, incineration and composting, and the incineration method gradually becomes the trend of municipal waste treatment due to the advantages of small occupied area, short treatment time, obvious reduction (the mass reduction generally can reach 70 percent, and the volume reduction can reach 90 percent), more thorough harmless treatment, capability of recovering waste heat from garbage incineration and the like.
The incineration fly ash refers to incineration residue collected by a flue gas purification system of a waste incineration plant, the generation amount of fly ash per ton of waste incineration in China is 30-200 kg, the number of the grate furnace is 30-50kg, and the number of the fluidized bed is 150 kg. The fly ash is generally considered as a dangerous waste because it contains heavy metals, soluble salts and organic chlorides (polychlorinated biphenyl and dioxin) with high leaching toxicity, and has great threat to the environment. The surface and the interior of the incineration fly ash are both enriched with a large amount of heavy metals, wherein the Zn and the Pb are the most, the leaching concentration is as high as 35.84mg/L and 5.98mg/L, and the underground water quality can be seriously polluted by direct landfill.
At present, fly ash is treated by mainly adopting cement solidification and chelating agent stabilization methods in China, and the solidified fly ash is mainly transported to a household garbage landfill site for landfill. A small amount of cement is prepared after pretreatment and washing through a cement kiln, the fly ash contains a large amount of calcium hydroxide and chloride, the content of the chloride is too high, the viscosity of calcium hydroxide slurry is high, the mixing cannot be uniform in the washing process, and the filter is easy to block, so that the washing dechlorination effect is low, and the subsequent cement kiln cooperative treatment or other harmless treatment is influenced. The weight of the fly ash filtered residue after washing is 1.1-1.3 times of that of the original fly ash, so that the burden of cement kiln cooperative treatment or harmless treatment is too heavy, and particularly in areas without cement kiln cooperative treatment devices, the harmless treatment cost is high, and the treatment cost of the fly ash is increased rapidly.
Accordingly, there is a need for improvements in the art.
Disclosure of Invention
The invention aims to provide an efficient device and process for treating waste incineration fly ash as a resource.
In order to solve the technical problem, the invention provides a process for recycling waste incineration fly ash, which comprises the following steps:
step one, adding fly ash and water into a first water washing and filtering device for slurrying and washing, wherein the mass ratio of fly ash to water is 1: 1-10 of mixed washing, and then filtering to obtain a filtrate filtered by the first washing filtering device and a filter cake filtered by the first washing filtering device;
adding a filter cake filtered by the first water washing filtering device into a second reaction device, adding hydrochloric acid for reaction, wherein the mass content of the hydrochloric acid is 10-31%, and controlling the pH value at the end of the reaction to be 1.0-4.0; obtaining acidic slurry after the reaction of the second reaction device;
step three, adding the acid slurry reacted by the second reaction device into a first acid washing filtering device for filtering to obtain an acid filter cake filtered by the first acid washing filtering device and an acid filtrate filtered by the first acid washing filtering device;
step four, adding the acid filter cake filtered by the first acid washing filtering device into a second water washing filtering device, and then adding water, wherein the acid filter cake filtered by the first acid washing filtering device and the water are mixed according to the mass ratio of 1: 1-10 of mixed washing, and then filtering to obtain filtrate filtered by a second washing filtering device and filter cakes filtered by the second washing filtering device;
and fifthly, performing harmless treatment on the filter cake filtered by the second water washing and filtering device.
As an improvement of the process for resource treatment of the waste incineration fly ash of the invention: further comprising the steps of:
step six, adding the filtrate filtered by the first washing and filtering device into a first reaction device for pretreatment, adding sodium carbonate for reaction, removing calcium and magnesium ions in the filtrate filtered by the first washing and filtering device, and taking the remaining filtrate which mainly comprises sodium chloride and potassium chloride as the filtrate pretreated by the first reaction device;
step seven, adding the filtrate pretreated by the first reaction device into a crystallization salt separation device for evaporation crystallization to obtain sodium chloride crystals meeting the standard, and filtering and packaging the sodium chloride crystals for sale;
then cooling and crystallizing to obtain potassium chloride crystals meeting the standard, filtering and packaging the potassium chloride crystals for sale, and circulating the mother liquor back to an evaporation crystallization system;
and adding the steam condensate water obtained by the crystallization salt separation device into a first washing filtering device of the washing process for recycling.
As an improvement of the process for resource treatment of the waste incineration fly ash of the invention: further comprising the steps of:
step eight, adding the acidic filtrate filtered by the first acid washing filtering device and the filtrate filtered by the second water washing filtering device into a third reaction device together for mixing, adding liquid alkali or calcium hydroxide, adjusting the pH to 9-12, converting heavy metal, aluminum ions and magnesium ions in the filtrate into hydroxide, separating out the hydroxide, and then filtering to obtain the remaining solution which is mainly calcium chloride solution and is used as the solution after the reaction of the third reaction device;
step nine, adding the solution reacted by the third reaction device into a first filtering device for filtering to obtain a filter cake filtered by the first filtering device and a filtrate filtered by the first filtering device;
step ten, adding the filtrate filtered by the first filtering device into an evaporation and concentration device for evaporation and concentration; and the steam condensate water part of the evaporation concentration device returns to a second washing filtering device in the second washing procedure for recycling, and the redundant part is discharged outside.
As an improvement of the process for resource treatment of the waste incineration fly ash of the invention:
the evaporation and concentration in the step ten comprises the following three treatment methods:
1) concentrating until the calcium chloride content is 50-65%, then adding into a cooling crystallization device for cooling crystallization to obtain flaky calcium chloride dihydrate, and drying to obtain the flaky calcium chloride dihydrate meeting the standard for sale;
2) concentrating until the content of calcium chloride is 35-45%, and then performing boiling granulation to prepare anhydrous granular calcium chloride;
3) concentrating to calcium chloride content of 35-45%, and selling to obtain liquid calcium chloride product.
As an improvement of the process for resource treatment of the waste incineration fly ash of the invention:
in the first step:
the mixed washing and filtering can adopt one-time washing and one-time filtering; or performing countercurrent washing for 2-4 times and then filtering;
part of the water added in the first water washing and filtering device is steam condensate water obtained by the crystallization and salt separation device;
in step four:
the mixed washing and filtering can adopt one-time washing and one-time filtering; or performing countercurrent washing for 2-4 times and then filtering;
all or part of the water added in the second water washing filtering device is steam condensate water obtained by the evaporation and concentration device.
As an improvement of the process for resource treatment of the waste incineration fly ash of the invention:
and the harmless treatment in the fifth step comprises the realization of the harmless treatment after the dioxin is removed, or the harmless treatment is realized by the cooperative treatment of the dioxin in a cement kiln.
The invention also provides a device for resourceful treatment of waste incineration fly ash, which comprises a first washing and filtering device, a second reaction device, a first acid washing and filtering device and a second washing and filtering device;
a filter residue outlet of the first water washing and filtering device is connected with an inlet of the second reaction device;
the outlet of the second reaction device is connected with the inlet of the first pickling and filtering device;
and a filter residue outlet of the first pickling filtering device is connected with an inlet of the second pickling filtering device.
As an improvement of the device for resource treatment of the waste incineration fly ash of the invention:
the device also comprises a first reaction device and a crystallization and salt separation device;
a filtrate outlet of the first water washing and filtering device is connected with an inlet of the first reaction device;
the outlet of the first reaction device is connected with the inlet of the crystallization salt separation device;
and a condensed water outlet of the crystallization salt separation device is connected with an inlet of the first water washing and filtering device.
As an improvement of the device for resource treatment of the waste incineration fly ash of the invention:
also comprises a third reaction device, a first filtering device, an evaporation and concentration device, a cooling and crystallization device and a drying device
The filtrate outlet of the first acid washing filtering device is connected with the inlet of the third reaction device;
a filtrate outlet of the second water washing and filtering device is connected with an inlet of a third reaction device;
the outlet of the third reaction device is connected with the inlet of the first filtering device;
the filtrate outlet of the first filtering device is connected with the inlet of the evaporation and concentration device;
a condensed water outlet of the evaporation concentration device is connected with an inlet of the second washing and filtering device;
the solid outlet of the evaporation concentration device is connected with the inlet of the cooling crystallization device;
and the outlet of the cooling crystallization device is connected with the inlet of the drying device.
As an improvement of the device for resource treatment of the waste incineration fly ash of the invention:
the first washing filtering device and the second washing filtering device are used for filtering the solution after water is added;
the first pickling filtering device and the first filtering device are used for filtering solution;
the first reaction device, the second reaction device and the third reaction device are used for the reaction of fly ash;
the crystallization salt separation device is used for evaporative crystallization and cooling crystallization;
the cooling crystallization device is used for cooling crystallization;
the drying device is used for drying.
The device and the process for the resource treatment of the waste incineration fly ash have the technical advantages that:
1. harmless treatment of the fly ash is realized, hazardous chlorine ions, soluble salts and heavy metals in the fly ash are washed out through primary washing, acid washing and secondary washing, the main components of the residual fly ash are silicon dioxide, calcium sulfate and a small amount of dioxin, and the fly ash is subjected to high-temperature catalytic oxidation detoxification or cement kiln cooperative treatment, so that complete harmless treatment of the fly ash is realized;
2. the process realizes the reduction and the resource utilization of the waste incineration fly ash, converts calcium carbonate and calcium oxide in the fly ash into flaky calcium chloride dihydrate or anhydrous granular calcium chloride for sale, and uses potassium ions and sodium ions in the fly ash to be sold after crystallization of potassium chloride and sodium chloride.
Therefore, the whole process of the invention utilizes all the components of the fly ash, achieves the effect of recovering all the elements and has important economic and social benefits.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic block diagram of a waste incineration fly ash recycling device of the present invention.
Detailed Description
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto.
Embodiment 1, a waste incineration fly ash resource processing device, as shown in fig. 1, includes a first water washing filter device 1, a first reaction device 2, a crystallization salt separation device 3, a second reaction device 4, a first acid washing filter device 5, a second water washing filter device 6, a third reaction device 7, a first filter device 8, an evaporation concentration device 9, a cooling crystallization device 10 and a drying device 11.
A filtrate outlet of the first water washing and filtering device 1 is connected with an inlet of the first reaction device 2;
the outlet of the first reaction device 2 is connected with the inlet of the crystallization salt separation device 3;
a condensed water outlet of the crystallization salt separation device 3 is connected with an inlet of the first water washing and filtering device 1;
a filter residue outlet of the first water washing and filtering device 1 is connected with an inlet of the second reaction device 4;
the outlet of the second reaction device 4 is connected with the inlet of the first pickling and filtering device 5;
a filter residue outlet of the first acid washing filter device 5 is connected with an inlet of the second water washing filter device 6;
the filtrate outlet of the first acid washing filtering device 5 is connected with the inlet of a third reaction device 7;
the filtrate outlet of the second water washing and filtering device 6 is connected with the inlet of the third reaction device 7;
the outlet of the third reaction device 7 is connected with the inlet of the first filtering device 8;
the filtrate outlet of the first filtering device 8 is connected with the inlet of the evaporation and concentration device 9;
the condensed water outlet of the evaporation concentration device 9 is connected with the inlet of the second washing and filtering device 6;
the solid outlet of the evaporation concentration device 9 is connected with the inlet of the cooling crystallization device 10;
the outlet of the cooling crystallization device 10 is connected with the inlet of the drying device 11.
The first washing filter device 1 and the second washing filter device 6 are used for filtering the solution after adding water;
the first pickling filtering device 5 and the first filtering device 8 are used for filtering the solution;
the first reaction device 2, the second reaction device 4 and the third reaction device 7 are used for the reaction of fly ash;
the crystallization and salt separation device 3 is used for evaporative crystallization and cooling crystallization;
the cooling crystallization device 10 is used for cooling crystallization;
the drying device 11 is used for drying.
A process for treating garbage incineration fly ash into resources comprises the following steps:
step one, adding fly ash and water into a first water washing filtering device (1) for slurrying and washing, wherein the mass ratio of the slurried fly ash to the water is 1: 2 (the range is 1: 1 to 1: 10), mixing, washing and filtering to obtain filtrate filtered by the first washing and filtering device (1) and filter cake filtered by the first washing and filtering device (1);
the mixed washing and filtering can adopt one-time washing and one-time filtering; or performing countercurrent washing for 2-4 times and then filtering;
part of the water added in the first water washing and filtering device 1 is steam condensate water obtained by the crystallization and salt separation device 3;
secondly, adding a filter cake filtered by the first water washing and filtering device 1 into a second reaction device 4, adding hydrochloric acid (the mass content is 10-31%) for reaction, and controlling the pH value of the reaction end point to be 1.0-4.0; obtaining acidic slurry after the reaction of the second reaction device 4;
step three, adding the acidic slurry reacted by the second reaction device 4 into the first pickling and filtering device 5 for filtering to obtain an acidic filter cake filtered by the first pickling and filtering device 5 and an acidic filtrate filtered by the first pickling and filtering device 5;
step four, adding the acid filter cake filtered by the first acid washing filtering device 5 into the second water washing filtering device 6, and then adding water, wherein the acid filter cake filtered by the first acid washing filtering device 5 and the water are mixed according to the mass ratio of 1: 5, mixing, washing and filtering to obtain filtrate filtered by the second washing and filtering device 6 and filter cakes filtered by the second washing and filtering device 6;
the mixed washing and filtering can adopt one-time washing and one-time filtering; or performing countercurrent washing for 2-4 times and then filtering;
all or part of the water added in the second washing and filtering device 6 is steam condensate water obtained by the evaporation and concentration device 9;
fifthly, performing harmless treatment on a filter cake filtered by the second washing and filtering device 6;
the harmless treatment comprises the realization of the harmless treatment after the removal of dioxin or the realization of the harmless treatment by the cooperative treatment of a cement kiln;
step six, adding the filtrate filtered by the first washing and filtering device 1 into a first reaction device 2 for pretreatment, adding sodium carbonate for reaction, removing calcium and magnesium ions in the filtrate filtered by the first washing and filtering device 1, and taking the remaining filtrate as the filtrate pretreated by the first reaction device 2, wherein the main component of the filtrate is sodium chloride and potassium chloride;
step seven, adding the filtrate pretreated by the first reaction device 2 into a crystallization salt separation device 3 for evaporative crystallization to obtain sodium chloride crystals meeting the standard, and filtering and packaging the sodium chloride crystals for sale;
and then cooling and crystallizing to obtain potassium chloride crystals meeting the standard, filtering and packaging the potassium chloride crystals for sale, and circulating the mother liquor back to the evaporation and crystallization system.
The steam condensate water obtained by the crystallization salt separation device 3 is added into the first water washing filtering device 1 of the water washing process for recycling.
Step eight, adding the acidic filtrate filtered by the first acid washing filtering device 5 and the filtrate filtered by the second water washing filtering device 6 into a third reaction device 7 together for mixing, adding liquid alkali or calcium hydroxide, adjusting the pH to 9-12, converting heavy metal, aluminum ions and magnesium ions in the filtrate into hydroxide, separating out the hydroxide, and then filtering to obtain the remaining solution which is mainly calcium chloride solution and is used as the solution after the reaction of the third reaction device 7;
step nine, adding the solution reacted by the third reaction device 7 into the first filtering device 8 for filtering to obtain a filter cake filtered by the first filtering device 8 and a filtrate filtered by the first filtering device 8;
step ten, adding the filtrate filtered by the first filtering device 8 into an evaporation concentration device 9 for evaporation concentration, returning part of the steam condensate of the evaporation concentration device 9 to the second washing filtering device 6 in the second washing procedure for reuse, and discharging the redundant part. The evaporation concentration comprises the following three treatment methods:
(1) concentrating until the calcium chloride content is 50-65%, then adding into a cooling crystallization device 10 for cooling crystallization to obtain flaky calcium chloride dihydrate, and drying to obtain the flaky calcium chloride dihydrate meeting the standard. Part of the steam condensate water of the evaporation concentration device 9 returns to the second washing and filtering device 6 in the second washing procedure for recycling, and the redundant part is discharged or sold;
(2) concentrating until the calcium chloride content is 35-45%, and boiling and granulating to obtain anhydrous granular calcium chloride. Part of the steam condensate water after evaporation concentration returns to a second washing filtering device 6 in the second washing procedure for recycling, and the redundant part is discharged or sold;
(3) concentrating until the calcium chloride content is 35-45%, and selling, returning the steam condensate part after evaporation concentration to the second water washing filtering device 6 in the second water washing process for reuse, and discharging or selling the redundant part.
Finally, it is also noted that the above-mentioned lists merely illustrate a few specific embodiments of the invention. It is obvious that the invention is not limited to the above embodiments, but that many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.

Claims (10)

1. A process for resource treatment of waste incineration fly ash is characterized by comprising the following steps: the method comprises the following steps:
step one, adding fly ash and water into a first water washing and filtering device (1) for slurrying and washing, wherein the mass ratio of fly ash to water is 1: 1-10, mixing, washing and filtering to obtain filtrate filtered by the first washing and filtering device (1) and filter cakes filtered by the first washing and filtering device (1);
secondly, adding a filter cake filtered by the first water washing and filtering device (1) into a second reaction device (4), adding hydrochloric acid for reaction, wherein the mass content of the hydrochloric acid is 10-31%, and controlling the pH value at the end point of the reaction to be 1.0-4.0; obtaining acidic slurry after the reaction of the second reaction device (4);
step three, adding the acid slurry reacted by the second reaction device (4) into the first pickling and filtering device (5) for filtering to obtain an acid filter cake filtered by the first pickling and filtering device (5) and an acid filtrate filtered by the first pickling and filtering device (5);
step four, adding the acid filter cake filtered by the first acid washing filtering device (5) into a second water washing filtering device (6), and then adding water, wherein the acid filter cake filtered by the first acid washing filtering device (5) and the water are mixed according to the mass ratio of 1: 1-10, mixing, washing and filtering to obtain filtrate filtered by the second water washing and filtering device (6) and filter cakes filtered by the second water washing and filtering device (6);
and step five, performing harmless treatment on the filter cake filtered by the second water washing and filtering device (6).
2. The process of claim 1 for resource treatment of fly ash from waste incineration, which is characterized in that: further comprising the steps of:
step six, adding the filtrate filtered by the first washing and filtering device (1) into a first reaction device (2) for pretreatment, adding sodium carbonate for reaction, removing calcium and magnesium ions in the filtrate filtered by the first washing and filtering device (1), and taking the remaining filtrate as the filtrate pretreated by the first reaction device (2), wherein the main components of the filtrate are sodium chloride and potassium chloride;
step seven, adding the filtrate pretreated by the first reaction device (2) into a crystallization and salt separation device (3) for evaporation crystallization to obtain sodium chloride crystals meeting the standard, and filtering and packaging the sodium chloride crystals for sale;
then cooling and crystallizing to obtain potassium chloride crystals meeting the standard, filtering and packaging the potassium chloride crystals for sale, and circulating the mother liquor back to an evaporation crystallization system;
and (3) adding the steam condensate water obtained by the crystallization salt separation device (3) into a first washing filtering device (1) of the washing process for recycling.
3. The process of claim 2 for resource treatment of fly ash from waste incineration, which is characterized in that: further comprising the steps of:
step eight, adding the acidic filtrate filtered by the first acid washing filtering device (5) and the filtrate filtered by the second water washing filtering device (6) into a third reaction device (7) together for mixing, adding liquid caustic soda or calcium hydroxide, adjusting the pH to 9-12, converting heavy metal, aluminum ions and magnesium ions in the filtrate into hydroxide, separating out the hydroxide, and then filtering to obtain the remaining solution which is mainly calcium chloride solution and is used as the solution after the reaction of the third reaction device (7);
step nine, adding the solution reacted by the third reaction device (7) into a first filtering device (8) for filtering to obtain a filter cake filtered by the first filtering device (8) and a filtrate filtered by the first filtering device (8);
step ten, adding the filtrate filtered by the first filtering device (8) into an evaporation and concentration device (9) for evaporation and concentration; and part of the steam condensate water of the evaporation concentration device (9) returns to the second water washing filtering device (6) in the second water washing procedure for recycling, and the redundant part is discharged outside.
4. The process of claim 3, wherein the process comprises the following steps:
the evaporation and concentration in the step ten comprises the following three treatment methods:
1) concentrating until the calcium chloride content is 50-65%, then adding into a cooling crystallization device (10) for cooling crystallization to obtain flaky calcium chloride dihydrate, and drying to obtain the flaky calcium chloride dihydrate meeting the standard for sale;
2) concentrating until the calcium chloride content is 35-45%, and then performing boiling granulation to prepare anhydrous granular calcium chloride;
3) concentrating to calcium chloride content of 35-45%, and selling to obtain liquid calcium chloride product.
5. The process of claim 4, wherein the fly ash from waste incineration is recycled by:
in the first step:
the mixed washing and filtering can adopt one-time washing and one-time filtering; or performing countercurrent washing for 2-4 times and then filtering;
part of the water added in the first water washing and filtering device (1) is steam condensate water obtained by the crystallization and salt separation device (3);
in step four:
the mixing, washing and filtering can adopt one-time washing and one-time filtering; or performing countercurrent washing for 2-4 times and then filtering;
all or part of the water added in the second water washing and filtering device (6) is steam condensate water obtained by the evaporation and concentration device (9).
6. The process of claim 5, wherein the process comprises the following steps:
and the harmless treatment in the fifth step comprises the realization of the harmless treatment after the dioxin is removed, or the harmless treatment is realized by the cooperative treatment of the dioxin in a cement kiln.
7. The utility model provides a waste incineration flying dust resourceful treatment's device which characterized in that: comprises a first washing filter device (1), a second reaction device (4), a first pickling filter device (5) and a second washing filter device (6);
a filter residue outlet of the first water washing filtering device (1) is connected with an inlet of the second reaction device (4);
the outlet of the second reaction device (4) is connected with the inlet of the first pickling and filtering device (5);
and a filter residue outlet of the first acid washing filtering device (5) is connected with an inlet of the second water washing filtering device (6).
8. The apparatus according to claim 7, wherein:
the device also comprises a first reaction device (2) and a crystallization and salt separation device (3);
a filtrate outlet of the first water washing and filtering device (1) is connected with an inlet of the first reaction device (2);
the outlet of the first reaction device (2) is connected with the inlet of the crystallization salt separation device (3);
and a condensed water outlet of the crystallization salt separation device (3) is connected with an inlet of the first water washing and filtering device (1).
9. The apparatus for recycling waste incineration fly ash according to claim 8, wherein:
the device also comprises a third reaction device (7), a first filtering device (8), an evaporation and concentration device (9), a cooling and crystallization device (10) and a drying device (11);
a filtrate outlet of the first acid washing filtering device (5) is connected with an inlet of a third reaction device (7);
a filtrate outlet of the second water washing and filtering device (6) is connected with an inlet of a third reaction device (7);
the outlet of the third reaction device (7) is connected with the inlet of the first filtering device (8);
the filtrate outlet of the first filtering device (8) is connected with the inlet of the evaporation and concentration device (9);
a condensed water outlet of the evaporation concentration device (9) is connected with an inlet of the second washing and filtering device (6);
the solid outlet of the evaporation concentration device (9) is connected with the inlet of the cooling crystallization device (10);
the outlet of the cooling crystallization device (10) is connected with the inlet of the drying device (11).
10. The apparatus according to claim 9, wherein:
the first water washing filtering device (1) and the second water washing filtering device (6) are used for filtering the solution after water is added;
the first pickling filtering device (5) and the first filtering device (8) are used for filtering solution;
the first reaction device (2), the second reaction device (4) and the third reaction device (7) are used for the reaction of fly ash;
the crystallization and salt separation device (3) is used for evaporative crystallization and cooling crystallization;
the cooling crystallization device (10) is used for cooling crystallization;
the drying device (11) is used for drying.
CN202210214586.6A 2022-03-07 2022-03-07 Device and process for resourceful treatment of waste incineration fly ash Pending CN114602926A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN202210214586.6A CN114602926A (en) 2022-03-07 2022-03-07 Device and process for resourceful treatment of waste incineration fly ash

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