CN102126837B - Method for treating fly ash by water washing - Google Patents
Method for treating fly ash by water washing Download PDFInfo
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- CN102126837B CN102126837B CN2010105521628A CN201010552162A CN102126837B CN 102126837 B CN102126837 B CN 102126837B CN 2010105521628 A CN2010105521628 A CN 2010105521628A CN 201010552162 A CN201010552162 A CN 201010552162A CN 102126837 B CN102126837 B CN 102126837B
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- Prior art keywords
- solid
- flying dust
- liquid
- fly ash
- washing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a method for treating fly ash by water washing. The technical process of the method is as follows: weighing fly ash, and adding into a stirring tank; simultaneously adding water according to a water-to-fly ash ratio of 1:(2-6), stirring, and mixing; then, carrying out solid-liquid separation in a belt vacuum filter; putting the fly ash solid into a cement rotary kiln, andincinerating; adding sulfuric acid into the liquid to regulate the PH value to 6-8, and then adding a reagent, so that heavy metals in the solution settle out; then carrying out solid-liquid separation in the belt vacuum filter, landfilling the salts filtered out, introducing the liquid into a multi-effect evaporator, and evaporating; and carrying out washing liquid concentration to obtain a saturated solution, using the belt vacuum filter to filter out the salts, returning the liquid to the multi-effect evaporator to perform secondary evaporation, and repeating the cycle. By washing with water to transfer most of harmful elements in the fly ash into the water solution, the invention reduces the influence of the fly ash on the kiln system; and by combining the water washing mode and the cement kiln, the invention achieves the harmless treatment of the fly ash.
Description
Technical field
The present invention relates to dispose the method for flying dust, be specifically related to a kind of method of disposing flying dust by washing.
Background technology
Utilize cement kiln in disposal flying dust project great advantage to be arranged.The flying dust that produces after the waste incineration being carried out high temperature incineration with cement rotary kiln produce cement, is to eliminate dioxin in the incineration of refuse flyash and the effective method of curing heavy metal.Because kiln temperature is up to more than 1450 ℃, the high-temperature gas turbulent flow is strong in the kiln, the characteristics such as alkaline atmosphere, can effectively decompose dioxin and with the most heavy metals immobilizations in the danger wastes in grog, generate stable saline minerals, avoided its Re-pollution to environment.
Because some material composition is close in the composition in the incineration of refuse flyash and the cement, replace part material to make cement with incineration of refuse flyash, not only effectively process solid hazardous waste, saved resource, can turn waste into wealth, and the cement performance of producing can reach the standard of international ordinary Portland cement.Therefore, use incineration of refuse flyash to save and produce the Mineral resources that cement is used.But the muriate of high-content can produce to the cement rotary kiln body disadvantageous effects such as high temperature chloride corrosion in the incineration of refuse flyash, and uses in the cement that not treated incineration of refuse flyash produces cl content high, can not be used for Steel Concrete.
Summary of the invention
The object of the present invention is to provide a kind of method of disposing flying dust by washing, it is washed the most of chlorine in the flying dust and potassium, sodium and other heavy metals in the aqueous solution by washing, then adopt the mode of vacuum filtration with solid-liquid separation, mode with the concentrated distillation of low-temperature multi-effect analyzes the salt in the water at last, and the harmful element in the flying dust after the washing has been washed in the aqueous solution by washing, can the flying dust harmlessness disposing be fallen by quality coal in cement kiln systems fully, reduce the infringement to kiln system.
The objective of the invention is to realize that by following technical scheme its technical process may further comprise the steps:
One, the washing stage
(1) flying dust in the warehouse is joined in the stirred pot by blanking scale, water and flying dust are joined in the stirred pot according to 1: 2～6 ratio fully mix simultaneously;
The flying dust that (2) will mix and the compounding substances of water filter by belt vacuum filter, with solid-liquid separation;
(3) the flying dust solid after the filtration can be put in the cement rotary kiln by the treatment system in early stage and burn, and the liquid after the filtration enters in the acid-base neutralisation tank, at first adds sulfuric acid, and the pH value of regulating liquid is controlled at about 6～8;
Inorganics (calcareous, siliceous, irony, aluminium matter) → Dicalcium Phosphate (Feed Grade) (2CaOSiO
2)+tricalcium silicate (3CaOSiO
2)+tricalcium aluminate (3CaOAl
2O
3)+tetracalcium aluminoferrite (4CaOAl
2O
3Fe
2O
3)
Organism 2CxHyOz+ (2x+y/2-z) O
2→ 2xCO
2+ yH
2The O+ heat
(annotate: iron, calcium, aluminium, silicon are the element that consists of cement, at high temperature participate in the reaction of cement clinker formation, and finally enter cement products.)
2KOH+H
2SO
4→K
2SO
4+2H
2O
2NaOH+H
2SO
4→Na
2SO
4+2H
2O
Ca(OH)
2+H
2SO
4→CaSO
4↓+2H
2O
The waste liquid that (4) will regulate pH value enters retort, adds the medicaments such as sodium sulphite, yellow soda ash, with the heavy metal precipitation in the solution out;
Na
2CO
3+Ca
2+→CaCO
3↓+2Na
2+
Na
2CO
3+Cu
2+→CuCO
3↓+2Na
2+
Na
2S+Cu
2+→CuS↓+2Na
2+
Na
2S+Zn
2+→ZnS↓+2Na
2+
Na
2S+Pb
2+→PbS↓+2Na
2+
Na
2S+Fe
2+→FeS↓+2Na
2+
Add what of the pharmaceutical quantities such as sodium sulphite, yellow soda ash, see the content of detected heavy metal in the waste liquid and decide.
(5) after medicament to be added fully reacts, enter belt vacuum filter and filter, with solid-liquid separation, the unit that the solid that leaches (salt) can be delivered to qualification carries out landfill;
Two, the distillation stage
(6) the flying dust washing lotion after will filtering is passed into and carries out vaporization cycle in the multiple-effect evaporator, after washing lotion is condensed into saturated solution, continue evaporation, solid (salt) begins to separate out, entering belt vacuum filter leaches solid (salt) again, liquid then turns back in the multiple-effect evaporator and again evaporates, and then repeats above-mentioned circulation;
After entering the flying dust washing lotion process distillation in the multiple effect distillator, concentration is more and more higher, and wherein the meltage of sodium-chlor and Repone K surpasses its solubleness gradually, and villaumite begins to separate out.Villaumite after separating out is filtered out by belt vacuum filter, then has again new flying dust washing lotion to enter into multiple-effect evaporator, repeats this process.
(7) unit that the solid that leaches (salt) can be delivered to qualification carries out landfill.
Flying dust solid in the step (3) is moisture about 40%, moisture flying dust solid about 40% is carried out early stage process, and then puts in the rotary kiln and burns; Described early stage, treatment system can be screenings system or sludge pump system.
Advantage of the present invention is:
1, by the method for washing the harmful element major part in the flying dust has been washed in the aqueous solution, reduced the impact of flying dust on kiln system.
2, by washing the method for being combined with cement kiln, realized the harmlessness disposing of flying dust.
Description of drawings
Accompanying drawing is a kind of process flow sheet of disposing the method for flying dust by washing.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
The described a kind of method by washing disposal flying dust of present embodiment, technical process may further comprise the steps as shown in drawings:
One, the washing stage
(1) flying dust in the warehouse is joined in the stirred pot by blanking scale, water and flying dust are joined in the stirred pot according to 1: 2～6 ratio fully mix simultaneously; In the present embodiment, water and flying dust join in the stirred pot according to 1: 4 ratio and fully mix.
The flying dust that (2) will mix and the compounding substances of water filter by belt vacuum filter, with solid-liquid separation;
(3) the flying dust solid after the filtration can be put in the cement rotary kiln by the treatment system in early stage and burn, and the liquid after the filtration enters in the acid-base neutralisation tank, and the pH value that at first adds sulfuric acid adjusting liquid is controlled at about 6～8; In the present embodiment, described early stage, treatment system was the screenings system, and described flying dust solid is moisture about 40%.
Inorganics (calcareous, siliceous, irony, aluminium matter) → Dicalcium Phosphate (Feed Grade) (2CaOSiO
2)+tricalcium silicate (3CaOSiO
2)+tricalcium aluminate (3CaOAl
2O
3)+tetracalcium aluminoferrite (4CaOAl
2O
3Fe
2O
3)
Organism 2CxHyOz+ (2x+y/2-z) O
2→ 2xCO
2+ yH
2The O+ heat
(annotate: iron, calcium, aluminium, silicon are the element that consists of cement, at high temperature participate in the reaction of cement clinker formation, and finally enter cement products.)
2KOH+H
2SO
4→K
2SO
4+2H
2O
2NaOH+H
2SO
4→Na
2SO
4+2H
2O
Ca(OH)
2+H
2SO
4→CaSO
4↓+2H
2O
The waste liquid that (4) will regulate pH value enters retort, adds the medicaments such as sodium sulphite, yellow soda ash, with the heavy metal precipitation in the solution out;
Na
2CO
3+Ca
2+→CaCO
3↓+2Na
2+
Na
2CO
3+Cu
2+→CuCO
3↓+2Na
2+
Na
2S+Cu
2+→CuS↓+2Na
2+
Na
2S+Zn
2+→ZnS↓+2Na
2+
Na
2S+Pb
2+→PbS↓+2Na
2+
Na
2S+Fe
2+→FeS↓+2Na
2+
Add what of the pharmaceutical quantities such as sodium sulphite, yellow soda ash, see the content of detected heavy metal in the waste liquid and decide.
(5) after medicament to be added fully reacts, enter belt vacuum filter and filter, with solid-liquid separation, the unit that the solid that leaches (salt) can be delivered to qualification carries out landfill;
Two, the distillation stage
(6) the flying dust washing lotion after will filtering is passed into and carries out vaporization cycle in the multiple-effect evaporator, after washing lotion is condensed into saturated solution, continue evaporation, solid (salt) begins to separate out, entering belt vacuum filter leaches solid (salt) again, liquid then turns back in the multiple-effect evaporator and again evaporates, and then repeats above-mentioned circulation;
After entering the flying dust washing lotion process distillation in the multiple effect distillator, concentration is more and more higher, and wherein the meltage of sodium-chlor and Repone K surpasses its solubleness gradually, and villaumite begins to separate out.Villaumite after separating out is filtered out by belt vacuum filter, then has again new flying dust washing lotion to enter into multiple-effect evaporator, repeats this process.
(7) unit that the solid that leaches (salt) can be delivered to qualification carries out landfill.
Claims (1)
1. one kind is passed through the method that flying dust is disposed in washing, and it is characterized in that: its technical process is:
One, the washing stage
(1) flying dust in the warehouse is joined in the stirred pot by blanking scale, water and flying dust are joined in the stirred pot according to 1: 2～6 ratio fully mix simultaneously;
The flying dust that (2) will mix and the compounding substances of water filter by belt vacuum filter, with solid-liquid separation;
(3) the flying dust solid after filtering by early stage treatment system put in the cement rotary kiln and burn, the liquid after the filtration enters in the acid-base neutralisation tank, at first adds sulfuric acid and regulates the pH value of liquid and be controlled at 6～8;
The waste liquid that (4) will regulate pH value enters retort, adds sodium sulphite, yellow soda ash medicament, with the heavy metal precipitation in the solution out;
(5) after medicament to be added fully reacts, enter belt vacuum filter and filter, with solid-liquid separation, the unit that the solid that leaches is delivered to qualification carries out landfill;
Two, the distillation stage
(6) the flying dust washing lotion after will filtering is passed into and carries out vaporization cycle in the multiple-effect evaporator, after washing lotion is condensed into saturated solution, continue evaporation, solid begins to separate out, entering belt vacuum filter leaches solid again, liquid then turns back in the multiple-effect evaporator and again evaporates, and then repeats above-mentioned circulation;
(7) unit that the solid that leaches is delivered to qualification carries out landfill;
Flying dust solid in the described step (3) is moisture 40%; Described early stage, treatment system was screenings system or sludge pump system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105521628A CN102126837B (en) | 2010-11-22 | 2010-11-22 | Method for treating fly ash by water washing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105521628A CN102126837B (en) | 2010-11-22 | 2010-11-22 | Method for treating fly ash by water washing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102126837A CN102126837A (en) | 2011-07-20 |
| CN102126837B true CN102126837B (en) | 2013-02-20 |
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ID=44265160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105521628A Active CN102126837B (en) | 2010-11-22 | 2010-11-22 | Method for treating fly ash by water washing |
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| Country | Link |
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| CN (1) | CN102126837B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108971206B (en) * | 2018-08-10 | 2019-07-23 | 成都恒鑫和环保科技有限公司 | The efficient flying dust stabilizing treatment system of PDS |
| CN109251729B (en) * | 2018-11-01 | 2021-06-22 | 杭州秀澈环保科技有限公司 | Method for simultaneously preparing I-type and II-type snow melting agents by utilizing garbage fly ash |
| CN109575880B (en) * | 2018-11-01 | 2021-07-02 | 杭州秀澈环保科技有限公司 | Method for preparing I-type snow melting agent by utilizing garbage fly ash |
| CN111744922A (en) * | 2019-03-29 | 2020-10-09 | 温州桂森环境科技有限公司 | Fly ash treatment process in waste incineration process |
| CN111100719B (en) * | 2019-12-18 | 2021-04-20 | 杭州电子科技大学 | Preparation method of water-washed fly ash derived fuel |
| CN111589837A (en) * | 2020-04-12 | 2020-08-28 | 北京锐上思环保科技有限公司 | Reinforced desalting method for water washing pretreatment of fly ash |
| CN111515225A (en) * | 2020-04-28 | 2020-08-11 | 南方科技大学 | Method for treating waste incineration fly ash |
| CN113941580B (en) * | 2021-08-31 | 2023-07-14 | 江西盖亚环保科技有限公司 | Multistage reverse pulping fly ash water washing process |
| CN116199377B (en) * | 2023-02-23 | 2023-12-08 | 浙江大学 | Incineration fly ash resource utilization method for quality control of washing waste salt |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101758061A (en) * | 2010-01-29 | 2010-06-30 | 清华大学 | Method for pretreating fly ash of domestic refuse incineration through cooperative disposal of cement kilns |
| CN101817650A (en) * | 2010-05-04 | 2010-09-01 | 北京市琉璃河水泥有限公司 | Method for treating incinerated fly ash of domestic garbage with cooperation of cement kiln |
-
2010
- 2010-11-22 CN CN2010105521628A patent/CN102126837B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101758061A (en) * | 2010-01-29 | 2010-06-30 | 清华大学 | Method for pretreating fly ash of domestic refuse incineration through cooperative disposal of cement kilns |
| CN101817650A (en) * | 2010-05-04 | 2010-09-01 | 北京市琉璃河水泥有限公司 | Method for treating incinerated fly ash of domestic garbage with cooperation of cement kiln |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102126837A (en) | 2011-07-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: BEIJING CEMENT PLANT CO., LTD. Free format text: FORMER OWNER: BEIJING XINBEISHUI CEMENT CO., LTD. Effective date: 20111212 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20111212 Address after: 102202 Beijing city Changping District Beixiaoying Applicant after: Beijing Cement Plant Co., Ltd. Address before: 102202 Beijing City, Changping District Beijing New Taipei water Beixiaoying cement limited liability company Applicant before: Beijing Xinbeishui Cement Co., Ltd. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161013 Address after: 102202 Beijing city Changping District Machi Town Beixiaoying village of Beijing cement factory Patentee after: Beijing Jinyu North Water Environmental Protection Science and technology limited company Address before: 102202 Beijing city Changping District Beixiaoying Patentee before: Beijing Cement Plant Co., Ltd. |