CN115156266A - Waste incineration fly ash washing process - Google Patents
Waste incineration fly ash washing process Download PDFInfo
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- CN115156266A CN115156266A CN202210803497.5A CN202210803497A CN115156266A CN 115156266 A CN115156266 A CN 115156266A CN 202210803497 A CN202210803497 A CN 202210803497A CN 115156266 A CN115156266 A CN 115156266A
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- mud
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- filtrate
- water mixture
- fly ash
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- 238000005406 washing Methods 0.000 title claims abstract description 78
- 239000010881 fly ash Substances 0.000 title claims abstract description 58
- 238000004056 waste incineration Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 83
- 239000000706 filtrate Substances 0.000 claims abstract description 58
- 239000000203 mixture Substances 0.000 claims abstract description 53
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 238000000926 separation method Methods 0.000 claims abstract description 21
- 238000002386 leaching Methods 0.000 claims abstract description 19
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000460 chlorine Substances 0.000 claims abstract description 16
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 16
- 239000012065 filter cake Substances 0.000 claims abstract description 12
- 239000010802 sludge Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 description 22
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 19
- 239000004568 cement Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 241000537371 Fraxinus caroliniana Species 0.000 description 2
- 235000010891 Ptelea trifoliata Nutrition 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006298 dechlorination reaction Methods 0.000 description 1
- -1 dioxin organic compounds Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 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
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
- B01D36/045—Combination of filters with centrifugal separation devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B2101/00—Type of solid waste
- B09B2101/30—Incineration ashes
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a waste incineration fly ash washing process, which comprises the following steps: conveying the incineration fly ash to a primary washing barrel to generate a first muddy water mixture; conveying the first mud-water mixture to a horizontal screw centrifuge I to form a first filtrate and a first agglomerated mud; conveying the first filtrate to a plate-and-frame filter press I to form a second filtrate and a first mud cake; conveying the first group of mud and the first mud cake to a second-stage washing barrel to form a second mud-water mixture; conveying the mud-water mixture II to a horizontal screw centrifuge II to form mud agglomerate II; conveying the second group of mud to a third-stage washing barrel to form a third mud-water mixture; conveying the mud-water mixture III to a horizontal screw centrifuge III to form filtrate IV and agglomerate mud III; conveying the filtrate IV to a secondary washing barrel; conveying the clustered sludge III to a heavy metal leaching barrel to form a sludge-water mixture IV; conveying the mud-water mixture IV to a plate-and-frame filter press II to form a filter cake II; conveying the filter cake II to a fourth-stage washing barrel to form a mud-water mixture V; and carrying out solid-liquid separation on the mud-water mixture V. The invention can effectively remove soluble chlorine and soluble heavy metals in the fly ash.
Description
Technical Field
The invention belongs to the technical field of waste incineration fly ash treatment, and particularly relates to a waste incineration fly ash washing process.
Background
The fly ash (fly ash for short) from domestic garbage incineration is prepared from fly ash obtained from flue gas collection system of garbage incineration power plant, and comprises fluidized bed fly ash and grate furnace fly ash, wherein the fly ash contains CaO and SiO as main components 2 、Na 2 O、K 2 O、Fe 2 O 3 、Al 2 O 3 The mass fraction of CaO is 20.4-37.9%, the main hazardous substances are heavy metals (Zn, pb, cu, cr, cd, ni, hg and the like) and dioxin organic compounds, the mass fraction of chlorine in the incineration fly ash is the highest and can exceed 25%, and the proportion of soluble chlorine in the total chlorine is 40.6-83.9%.
Fly ash is dangerous waste, and the main treatment method at present is to enter a flexible landfill site or directly enter a rigid landfill site after chelation, so that a large amount of permanent land occupation is occupied, the design service life is limited, the risk of leachate leakage exists, and the maintenance time after retirement is long. In order to change the waste of the fly ash into valuable, the fly ash is treated and then recycled, which becomes the focus of more attention of the society at present. At present, the resource utilization of fly ash mainly comprises cement kiln cooperative treatment, high-temperature melting and low-temperature thermal decomposition, wherein the fly ash needs to be dechlorinated by the cement kiln cooperative treatment and the low-temperature thermal decomposition process so as to be put into resource utilization.
The method of high-temperature melting, water washing and the like can effectively remove chloride ions in the fly ash. The main stream method of water washing dechlorination is multi-stage countercurrent rinsing, which can effectively reduce the content of soluble chlorine in the fly ash to 1 percent and achieve the relevant standard requirements of HJ 1134-2020. But the soluble heavy metal content of the fly ash after water washing fluctuates greatly, and a separate heavy metal elution unit is added for better eluting the heavy metal in the fly ash. Therefore, a water washing process of the waste incineration fly ash is provided to better remove soluble chlorine and soluble heavy metals in the fly ash and ensure that the soluble chlorine and the soluble heavy metals stably reach the standard requirements of HJ1134-2020 and GB 8978.
Disclosure of Invention
The invention aims to solve the problems that the soluble chlorine and the soluble heavy metal in the existing fly ash washing process can not stably reach the standard and the like, and provides a waste incineration fly ash washing process.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a waste incineration fly ash washing process comprises the following steps:
(1) Conveying the incineration fly ash to a primary washing barrel, and rinsing soluble chlorine and soluble heavy metals in the incineration fly ash to generate a first muddy water mixture;
(2) Conveying the first mud-water mixture to a horizontal screw centrifuge I for solid-liquid separation to form a first filtrate and a first agglomerated mud;
(3) Conveying the first filtrate to a plate-and-frame filter press I for solid-liquid separation to form a second filtrate and a first mud cake;
conveying the first group of mud and the first mud cake to a second-stage washing barrel for second-stage washing to form a second mud-water mixture;
(4) Conveying the mud-water mixture II to a horizontal screw centrifuge II for solid-liquid separation to form filtrate III and agglomerated mud II;
(5) Conveying the filtrate III to a first-stage washing barrel;
conveying the second group of mud to a third-stage washing barrel for third-stage washing to form a mud-water mixture III;
(6) Conveying the mud-water mixture III to a horizontal screw centrifuge III for solid-liquid separation to form filtrate IV and agglomerate mud III;
(7) Conveying the filtrate IV to a secondary washing barrel;
conveying the agglomerate mud III to a heavy metal leaching barrel to leach heavy metals in the fly ash to form a mud-water mixture IV; wherein the heavy metal leaching barrel is provided with a heavy metal leaching agent;
(8) Conveying the mud-water mixture IV to a plate-and-frame filter press II for solid-liquid separation to form filtrate V and a filter cake II;
(9) Conveying the filter cake II to a fourth-stage washing barrel, and rinsing heavy metal and soluble chlorine in the filter cake II to form a mud-water mixture V;
(10) Conveying the mud-water mixture V to a horizontal screw centrifuge IV for solid-liquid separation to form filtrate V and agglomerated mud IV;
(11) Conveying the filtrate six to a third-stage washing barrel; and recycling the cluster mud IV.
Preferably, in the step (2), the solid content of the first filtrate is 2-4%, and the water content of the first agglomerate is 35-40%.
Preferably, in the step (3), the filtrate I is stored in a buffer tank before being conveyed to the plate-and-frame filter press I.
Preferably, the first filtrate flows to the buffer tank automatically through a pipeline.
Preferably, in the step (3), the water content of the first mud cake is 30-35%.
Preferably, in the step (4), the water content of the second agglomerate is 35-40%.
Preferably, in the step (6), the moisture content of the third agglomerate is 35 to 40%.
Preferably, in the step (7), the leaching rate of the heavy metal is 80 to 90%.
Preferably, in the step (8), the water content of the mud cake II is 30-35%.
Preferably, in the step (10), the moisture content of the lump of mud four is 35 to 40%.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts 'three-stage water washing, first-stage heavy metal leaching and first-stage water washing', can further reduce the soluble chlorine content of the water-washed fly ash, can reduce the water-cement ratio of the water-washed fly ash, and can make the water-cement ratio reach 1.5:1, lightening the running load of water treatment and MVR;
secondly, the introduction of heavy metal leaching effectively solves the problem of large fluctuation of the content of soluble heavy metal in the washing fly ash, and the soluble heavy metal in the washing fly ash can stably reach the standard;
the solid-liquid separation mode of the invention is a combined process of a horizontal screw centrifuge and a plate-and-frame filter press, the advantage of the automation degree of the horizontal screw centrifuge can be fully utilized, and the plate-and-frame filter press can further solve the problem of high solid content of the first-washing filtrate;
and (IV) the four-stage water washing adopts a horizontal screw centrifuge to carry out solid-liquid separation, and the mud agglomerates are more beneficial to subsequent drying, crushing and resource utilization.
Drawings
FIG. 1 is a flow chart of a waste incineration fly ash water washing process according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, without inventive effort, other drawings and embodiments can be derived from them.
As shown in fig. 1, the waste incineration fly ash washing process of the embodiment of the invention comprises the following steps:
(1) The incineration fly ash enters a primary washing barrel through a conveying system 1, and soluble chlorine and soluble heavy metals in the incineration fly ash are rinsed to generate a muddy water mixture 1;
(2) The mud-water mixture 1 enters a horizontal screw centrifuge 1 through a conveying system 2, and solid-liquid separation is carried out on the mud-water mixture 1 to form filtrate 1 and agglomerated mud 1;
(3) The filtrate 1 enters a buffer tank through a conveying system 3, and the filtrate 1 is temporarily stored;
(4) The filtrate 1 enters a plate-and-frame filter press 1 through a conveying system 4, and solid-liquid separation is carried out on the filtrate 1 to form filtrate 2 and mud cakes 1;
(5) The filtrate 2 enters a water treatment system through a conveying system 5;
(6) The mud lumps 1 enter a secondary washing barrel through a conveying system 6, and the mud lumps 1 are subjected to secondary washing to form a mud-water mixture 2;
(7) The mud cakes 1 enter a secondary washing barrel through a conveying system 7, and secondary washing is carried out on the mud cakes 2 to form a mud-water mixture 2;
(8) The mud-water mixture 2 enters a horizontal screw centrifuge 2 through a conveying system 8, and solid-liquid separation is carried out on the mud-water mixture 2 to form filtrate 3 and agglomerated mud 2;
(9) The filtrate 3 enters a first-stage washing barrel through a conveying system 9, and the fly ash is subjected to first-stage washing;
(10) The mud 2 enters a third-stage washing barrel through a conveying system 10, and the mud 2 is washed in a third stage to form a mud-water mixture 3;
(11) The mud-water mixture 3 enters a horizontal screw centrifuge 3 through a conveying system 11, and solid-liquid separation is carried out on the mud-water mixture 3 to form filtrate 4 and agglomerated mud 3;
(12) The filtrate 4 enters a secondary washing barrel through a conveying system 12, and secondary washing is carried out on the fly ash;
(13) The agglomerate mud 3 enters a heavy metal leaching barrel through a conveying system 13 to leach heavy metals in the fly ash to form a mud-water mixture 4;
(14) The heavy metal leaching agent enters a heavy metal leaching barrel through a conveying system 14 to leach heavy metals in the fly ash to form a muddy water mixture 4;
(15) The mud-water mixture 4 enters a plate-and-frame filter press 2 through a conveying system 15, and solid-liquid separation is carried out on the mud-water mixture 4 to form a filtrate 5 and a filter cake 2;
(16) The filtrate 5 enters a water treatment system through a conveying system 16 to remove heavy metals in the filtrate 5;
(17) The filter cake 2 enters a four-stage washing barrel through a conveying system 17, and heavy metal and soluble chlorine in the filter cake 2 are rinsed to form a mud-water mixture 5;
(18) The mud-water mixture 5 enters a horizontal screw centrifuge 4 through a conveying system 18, and the solid-liquid separation is carried out on the mud-water mixture 5 to form filtrate 6 and agglomerate mud 4;
(19) The filtrate 6 enters a third-stage washing barrel through a conveying system 19, and the mud 2 is washed in a third-stage manner to form a mud-water mixture 3;
(20) The group mud 4 enters a washing ash recycling system through a conveying system 20, and the group mud 4 is recycled.
In the step (1), the conveying system 1 is a pipe chain conveying system, and the fly ash is conveyed to the primary washing barrel through a pipe chain. Wherein, the pipe chain material is anticorrosive Q235 of inside lining.
In addition, the material of the first-level washing barrel is one of anticorrosive Q235 or 2205 duplex stainless steel of inside lining.
In the step (2), the filtrate 1 contains 8 to 15 percent of chloride ions, 1 to 3 percent of sodium ions, 1 to 3 percent of potassium ions and 2 to 4 percent of calcium ions.
In the step (2), the conveying system 2 is a pipeline conveying system, and the mud-water mixture 1 is pumped into the horizontal decanter centrifuge 1 through the pipeline conveying system.
Wherein, the material of the conveying system 2 is one of anticorrosive Q235 of inside lining or 2205 duplex stainless steel.
The solid content of the filtrate 1 is preferably 2 to 4%, and the water content of the sludge 1 is preferably 35 to 40%.
In the step (3), the conveying system 3 is a pipeline conveying system, and the filtrate 1 automatically flows into the buffer storage barrel through a pipeline.
Wherein, the material of the pipeline of the conveying system 3 is one of anticorrosive Q235 of inside lining or 2205 duplex stainless steel.
In addition, the volume of the buffer storage barrel is 2h of the production amount of the filtrate 1, and the material is one of anticorrosive Q235 or 2205 double-phase stainless steel of the lining.
In the step (4), the conveying system 4 is a pipeline conveying system, and the filtrate 1 is pumped into the plate and frame filter press 1 through a pipeline.
Wherein, the pipeline material of conveying system 4 is one of anticorrosive Q235 of inside lining or 2205 duplex stainless steel.
The feeding pressure of the plate-and-frame filter press 1 is 1.0MPa, and the pressing pressure is 1.6MPa.
The water content of the mud cake 1 is preferably 30-35%.
In the step (5), the conveying system 5 is a pipeline conveying system, and the filtrate 2 enters the water treatment system in a pipeline pumping or self-flowing mode.
In the step (6), the conveying system 6 is one of belt conveying or screw conveying, and the agglomerated sludge 1 enters the secondary washing barrel through the belt conveying or the screw conveying.
Wherein, 6 belts of conveying system are the rubber material, and auger delivery is one of anticorrosive Q235 of inside lining or 2205 duplex stainless steel.
The material of the second-level water washing barrel is one of anticorrosive Q235 or 2205 duplex stainless steel of inside lining.
In the step (7), the conveying system 7 is one of belt conveying or screw conveying, and the mud cakes 1 enter the secondary washing barrel through the belt conveying or the screw conveying.
Wherein, 6 belts of conveying system are the rubber material, and auger delivery is one of anticorrosive Q235 of inside lining or 2205 duplex stainless steel.
In the step (8), the conveying system 8 is a pipeline conveying system, and the mud-water mixture 2 enters the horizontal decanter centrifuge 2 in a pipeline pumping mode.
Wherein the water content of the cluster mud 2 is 35-40%.
In the step (9), the conveying system 9 is a pipeline conveying system, and the filtrate 3 is pumped into the first-stage washing barrel through a pipeline.
Wherein, the material of the pipeline of the conveying system 9 is one of anticorrosive Q235 of inside lining or 2205 duplex stainless steel.
In the step (10), the conveying system 10 is one of belt conveying or screw conveying, and the sludge 2 enters the third-stage washing barrel through the belt conveying or the screw conveying.
Wherein, conveying system 10 belt is the rubber material, and spiral delivery is one of anticorrosive Q235 of inside lining or 2205 duplex stainless steel.
The material of the third-level washing barrel is one of anticorrosive Q235 or 2205 duplex stainless steel of inside lining.
In the step (11), the conveying system 11 is a pipeline conveying system, and the mud-water mixture 3 enters the horizontal decanter centrifuge 3 in a pipeline pumping mode.
Wherein, the conveying system 11 is made of pipeline material and is one of anticorrosive Q235 of inside lining or 2205 duplex stainless steel.
The water content of the sludge 3 is preferably 35 to 40%.
In the step (12), the conveying system 12 is a pipeline conveying system, and the filtrate 4 is pumped into the secondary washing barrel through a pipeline.
Wherein, the material of the pipeline of the conveying system 12 is one of anticorrosive Q235 or 2205 duplex stainless steel of inside lining.
In the step (13), the conveying system 13 is one of belt conveying or screw conveying, and the mud cakes 3 enter the heavy metal leaching barrel through belt conveying or screw conveying.
Wherein, 13 belts of conveying system are the rubber material, and auger delivery is one of anticorrosive Q235 of inside lining or 2205 duplex stainless steel.
The heavy metal leaching barrel is made of PPH, and the leaching rate of heavy metal is preferably 80-90%.
In the step (14), the conveying system 14 is a pipeline conveying system, and the heavy metal leaching agent is metered and pumped into the heavy metal leaching barrel through a pipeline.
In the step (15), the conveying system 15 is a pipeline conveying system, and the mud-water mixture 4 is pumped into the plate and frame filter press 2 through a pipeline.
Wherein, the material of the conveying system 15 is one of anticorrosive Q235 of inside lining or 2205 duplex stainless steel.
The water content of the filter cake 2 is preferably 30 to 35%.
In the step (16), the conveying system 16 is a pipeline conveying system, and the filtrate 5 is pumped into the water treatment system through a pipeline.
Wherein, the material of the conveying system 16 is PPH.
In the step (17), the conveying system 17 is one of belt conveying or screw conveying, and the mud cakes 2 enter the four-stage washing barrel through the belt conveying or the screw conveying.
Wherein, conveying system 17 belt is the rubber material, and spiral delivery is one of anticorrosive Q235 of inside lining or 2205 duplex stainless steel.
The material of the four-stage water washing barrel is one of anticorrosive Q235 or 2205 duplex stainless steel of inside lining.
In the step (18), the conveying system 18 is a pipeline conveying system, and the mud-water mixture 5 is pumped into the horizontal screw centrifuge 4 through a pipeline.
Wherein, the material of the conveying system 18 is one of lining corrosion-resistant Q235 or 2205 duplex stainless steel.
The water content of the sludge 4 is preferably 35 to 40%.
In the step (19), the conveying system 19 is a pipeline conveying system, and the filtrate 6 is pumped into the third-stage washing barrel through a pipeline.
Wherein, the material of the conveying system 19 is one of anticorrosive Q235 of inside lining or 2205 duplex stainless steel.
In the step (20), the conveying system 20 is one of belt conveying or screw conveying, and the agglomerate mud 4 enters the washed ash recycling system through the belt conveying or the screw conveying.
Wherein, conveying system 20 belt is the rubber material, and spiral delivery is one of anticorrosive Q235 of inside lining or 2205 duplex stainless steel.
According to the waste incineration fly ash washing process provided by the embodiment of the invention, the soluble chlorine and the soluble heavy metal in the washing fly ash can stably reach the standard and can greatly reduce the water-ash ratio of the fly ash washing, and the lowest water-ash ratio can reach 1.5:1, in addition, the combination of the horizontal screw centrifuge and the plate-and-frame filter press improves the automation level of the whole production process under the condition of meeting the production requirement of water content.
The foregoing has outlined, rather broadly, the preferred embodiment and principles of the present invention in order that those skilled in the art may better understand the detailed description of the invention without departing from its broader aspects.
Claims (10)
1. A waste incineration fly ash washing process is characterized by comprising the following steps:
(1) Conveying the incineration fly ash to a primary washing barrel, and rinsing soluble chlorine and soluble heavy metals in the incineration fly ash to generate a first muddy water mixture;
(2) Conveying the first mud-water mixture to a horizontal screw centrifuge I for solid-liquid separation to form a first filtrate and a first agglomerated mud;
(3) Conveying the first filtrate to a plate-and-frame filter press I for solid-liquid separation to form a second filtrate and a first mud cake;
conveying the first group of mud and the first mud cake to a second-stage washing barrel for second-stage washing to form a second mud-water mixture;
(4) Conveying the mud-water mixture II to a horizontal screw centrifuge II for solid-liquid separation to form filtrate III and agglomerated mud II;
(5) Conveying the filtrate III to a first-stage washing barrel;
conveying the second group of mud to a third-stage washing barrel for third-stage washing to form a mud-water mixture III;
(6) Conveying the mud-water mixture III to a horizontal screw centrifuge III for solid-liquid separation to form filtrate IV and agglomerate mud III;
(7) Conveying the filtrate IV to a secondary washing barrel;
conveying the agglomerate mud III to a heavy metal leaching barrel to leach heavy metals in the fly ash to form a mud-water mixture IV; wherein the heavy metal leaching barrel is provided with a heavy metal leaching agent;
(8) Conveying the mud-water mixture IV to a plate-and-frame filter press II for solid-liquid separation to form filtrate V and a filter cake II;
(9) Conveying the filter cake II to a fourth-stage washing barrel, and rinsing heavy metal and soluble chlorine in the filter cake II to form a mud-water mixture V;
(10) Conveying the mud-water mixture V to a horizontal screw centrifuge IV for solid-liquid separation to form filtrate V and agglomerated mud IV;
(11) Conveying the filtrate six to a third-stage washing barrel; and recycling the cluster mud IV.
2. The waste incineration fly ash washing process according to claim 1, wherein in the step (2), the solid content of the first filtrate is 2-4%, and the water content of the first agglomerate is 35-40%.
3. The process of claim 1, wherein in the step (3), the first filtrate is stored in a buffer tank before being sent to the first plate-and-frame filter press.
4. The process of claim 3, wherein the first filtrate flows to the buffer tank through a pipeline.
5. The waste incineration fly ash washing process according to claim 1, wherein in the step (3), the water content of the sludge cake I is 30-35%.
6. The waste incineration fly ash washing process according to claim 1, wherein in the step (4), the water content of the second agglomerate is 35-40%.
7. The waste incineration fly ash washing process according to claim 1, wherein in the step (6), the moisture content of the mass mud III is 35-40%.
8. The waste incineration fly ash washing process according to claim 1, wherein in the step (7), the leaching rate of heavy metals is 80-90%.
9. The waste incineration fly ash washing process according to claim 1, wherein in the step (8), the water content of the mud cake two is 30-35%.
10. The waste incineration fly ash washing process according to claim 1, wherein in the step (10), the moisture content of the mass four is 35-40%.
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| CN202210803497.5A CN115156266A (en) | 2022-07-07 | 2022-07-07 | Waste incineration fly ash washing process |
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| CN202210803497.5A CN115156266A (en) | 2022-07-07 | 2022-07-07 | Waste incineration fly ash washing process |
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|---|---|---|---|---|
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| CN111822490A (en) * | 2020-08-19 | 2020-10-27 | 宋仁贵 | Household garbage incineration fly ash washing dechlorination and wastewater desalination and recycling process system |
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