CN103214039A - Comprehensive utilization method of coal ash - Google Patents
Comprehensive utilization method of coal ash Download PDFInfo
- Publication number
- CN103214039A CN103214039A CN 201310085283 CN201310085283A CN103214039A CN 103214039 A CN103214039 A CN 103214039A CN 201310085283 CN201310085283 CN 201310085283 CN 201310085283 A CN201310085283 A CN 201310085283A CN 103214039 A CN103214039 A CN 103214039A
- Authority
- CN
- China
- Prior art keywords
- fly ash
- flyash
- calcium
- filter cake
- oxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
Fly ash is burning waste from power plants. A large boiler burns several or even tens of tons of pulverized coal a day, and produces a large amount of fly ash after combustion. Fly ash contains 54% of silica, 31% of alumina, 5.6% of iron trioxide, 3.5% of magnesium oxide and 3.4% of calcium oxide. Stacking of fly ash occupies land, besides alkaline oxides in the fly ash turns into alkali when encounters with water, thereby polluting the land and water. The method for comprehensive utilization of fly ash is as below: conducting magnetic separation and alkali washing to wash away alumina; diluting to obtain aluminum hydroxide; conducting hydrochloric acid washing to wash away magnesium oxide and calcium oxide; adding a small amount of sulfuric acid to obtain a calcium sulfate precipitate; and separating magnesium and calcium to obtain the rest of silica. According to the above treatment, the fly ash turns into five chemical raw materials including ferric oxide, aluminium hydroxide, magnesium chloride, calcium sulfate and silica, so as to comprehensively utilize the fly ash. The method not only protects the environment but also produces economic benefits.
Description
Technical field
What the present invention proposed is the method for total utilization of PCA.
Background technology
Flyash is the waste residue of power plant burning, and general large-sized boiler burns the coal dust of several tons even tens tons every day, and the burning back produces a large amount of flyash, contains silicon-dioxide 54% in the flyash, aluminum oxide 31%, ferric oxide 5.6%.Magnesium oxide 3.5% and calcium oxide 3.4%, flyash is stacked not only land occupation, and basic oxide wherein and water will become alkali, and it has not only polluted the soil, has also polluted the water source.By magnetic separation, alkali cleaning, flush away aluminum oxide, dilution obtains aluminium hydroxide flyash for we.Chlorohydric acid pickling flush away magnesium oxide and calcium oxide.Add a spot of sulfuric acid and make calcium become calcium sulfate precipitation, magnesium is separated with calcium, and remaining is silicon-dioxide.Make flyash become ferric oxide, aluminium hydroxide, magnesium chloride, calcium sulfate and five kinds of industrial chemicals of silicon-dioxide through above-mentioned processing, make flyash obtain comprehensive utilization.It has not only protected environment to produce economic benefit again.
Summary of the invention
The present invention proposes is by screening, pulverizing, magnetic separation, alkali cleaning, dilution, pickling, add operations such as sulfuric acid, filtration.Make flyash become ferric oxide, aluminium hydroxide, magnesium chloride, calcium sulfate and five kinds of industrial chemicals of silicon-dioxide through above-mentioned processing, concrete scheme of the present invention is:
The screening of flyash, pulverizing process:
Flyash is by 180 order sub-sieves, and 5% unsanctionedly reaches till 180 through pulverizing.
The magnetic separation operation of flyash
Flyash is isolated ferric oxide with magnetic separation.
Alkali cleaning, filtration |, washing step
Above-mentioned flyash is mixed stirring with 10% sodium hydroxide, and the ratio of sodium hydroxide and flyash is classified 3:1 as, makes alumina dissolution enter liquid phase, and water cleans filter cake, makes its pH=7.5.
Dilution, filtration operation
The aforesaid liquid thin up is filtered till aluminum hydroxide precipitation is arranged, and filter cake is an aluminium hydroxide, and filtrate is joined alkali again.
Pickling, washing step
Filter cake after the washing with 3mol/l salt acid elution, is washed filter cake and obtained silicon-dioxide.
Add sulfuric acid, filter operation
Filtrate adds 5% sulfuric acid makes calcium be converted into calcium sulfate precipitation, filters and obtains calcium sulfate, and filtrate is magnesium chloride.
Description of drawings
Fig. 1 is the method process flow chart of total utilization of PCA of the present invention.
Embodiment
The screening of flyash, pulverizing process
By 180 order sub-sieves, 5% unsanctionedly reaches till 180 through pulverizing with 200 gram flyash.
The magnetic separation operation of flyash:
Flyash is isolated ferric oxide with magnetic separation.
Alkali cleaning, filtration |, washing step:
Above-mentioned flyash 200 grams are mixed stirring with 600 grams, 10% sodium hydroxide, make alumina dissolution enter liquid phase, water cleans filter cake, makes its pH=7.5.
Dilution, filtration operation:
The aforesaid liquid thin up is filtered till aluminum hydroxide precipitation is arranged, and filter cake is an aluminium hydroxide, and filtrate is joined alkali again.
Pickling, washing step:
Filter cake after the washing with 120 gram 3mol/l salt acid elutions, is washed filter cake and obtained silicon-dioxide.
Add sulfuric acid, filter operation:
Filtrate adds 300 grams, 5% sulfuric acid makes calcium be converted into calcium sulfate precipitation, filters and obtains calcium sulfate, and filtrate is magnesium chloride.
Claims (6)
1. the screening of flyash, pulverizing process:
Flyash is by 180 order sub-sieves, and 5% unsanctionedly reaches till 180 through pulverizing.
2. the magnetic separation operation of flyash:
Flyash is isolated ferric oxide with magnetic separation.
3. alkali cleaning, filtration |, washing step:
Above-mentioned flyash is mixed stirring with 10% sodium hydroxide, and the ratio of sodium hydroxide solution and flyash is 3:1, makes alumina dissolution enter liquid phase, and water cleans filter cake, makes its pH=7.5.
4. dilution, filtration operation:
The aforesaid liquid thin up is filtered till aluminum hydroxide precipitation is arranged, and filter cake is an aluminium hydroxide, and filtrate is joined alkali again.
5. pickling, washing step:
Filter cake after the washing with 3mol/l salt acid elution, is washed filter cake and obtained silicon-dioxide.
6. add sulfuric acid, filter operation:
Filtrate adds 5% sulfuric acid makes calcium be converted into calcium sulfate precipitation, filters and obtains calcium sulfate, and filtrate is magnesium chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310085283 CN103214039A (en) | 2013-03-18 | 2013-03-18 | Comprehensive utilization method of coal ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310085283 CN103214039A (en) | 2013-03-18 | 2013-03-18 | Comprehensive utilization method of coal ash |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103214039A true CN103214039A (en) | 2013-07-24 |
Family
ID=48812266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201310085283 Pending CN103214039A (en) | 2013-03-18 | 2013-03-18 | Comprehensive utilization method of coal ash |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103214039A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104803402A (en) * | 2014-01-23 | 2015-07-29 | 神华集团有限责任公司 | Method for separation and utilization of fly ash aluminum-silicon, and tobermorite and silicon oxide obtained through method |
| CN107188766A (en) * | 2017-07-26 | 2017-09-22 | 山东乡里乡亲互联网科技股份有限公司 | A kind of coal ash for manufacturing for silicon composite fertilizer method |
| CN111252774A (en) * | 2020-01-19 | 2020-06-09 | 刘文治 | Method for producing silica sol by using desulfurized gypsum and fly ash through treating waste with waste |
| CN113173604A (en) * | 2020-08-05 | 2021-07-27 | 河南济源钢铁(集团)有限公司 | Method for preparing nano iron and oxide thereof by taking sintering ash as raw material |
| CN113716634A (en) * | 2021-09-17 | 2021-11-30 | 内蒙古美赢环保科技有限公司 | Preparation method of petrochemical oily sewage treatment agent |
| CN113754365A (en) * | 2021-09-28 | 2021-12-07 | 共享智能装备有限公司 | 3D printing material based on coal-to-liquid waste residues, preparation method and use method |
-
2013
- 2013-03-18 CN CN 201310085283 patent/CN103214039A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104803402A (en) * | 2014-01-23 | 2015-07-29 | 神华集团有限责任公司 | Method for separation and utilization of fly ash aluminum-silicon, and tobermorite and silicon oxide obtained through method |
| CN104803402B (en) * | 2014-01-23 | 2017-03-01 | 神华集团有限责任公司 | A kind of flyash desilication using method and the tobermorite that obtains of its method and silicon oxide |
| CN107188766A (en) * | 2017-07-26 | 2017-09-22 | 山东乡里乡亲互联网科技股份有限公司 | A kind of coal ash for manufacturing for silicon composite fertilizer method |
| CN111252774A (en) * | 2020-01-19 | 2020-06-09 | 刘文治 | Method for producing silica sol by using desulfurized gypsum and fly ash through treating waste with waste |
| CN113173604A (en) * | 2020-08-05 | 2021-07-27 | 河南济源钢铁(集团)有限公司 | Method for preparing nano iron and oxide thereof by taking sintering ash as raw material |
| CN113716634A (en) * | 2021-09-17 | 2021-11-30 | 内蒙古美赢环保科技有限公司 | Preparation method of petrochemical oily sewage treatment agent |
| CN113754365A (en) * | 2021-09-28 | 2021-12-07 | 共享智能装备有限公司 | 3D printing material based on coal-to-liquid waste residues, preparation method and use method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103214039A (en) | Comprehensive utilization method of coal ash | |
| Matjie et al. | Extraction of alumina from coal fly ash generated from a selected low rank bituminous South African coal | |
| CN104495899A (en) | Method for synergic resource utilization of acetylene sludge and coal ash | |
| CN109354071B (en) | Method for producing battery-grade manganese sulfate by using manganese tailings and waste sulfuric acid of titanium white | |
| CN101871046A (en) | Method for recycling heavy metal pollution wastes | |
| CN102329964A (en) | Method for separating and recovering vanadium and chromium from vanadium-chromium reduced waste residue | |
| CN103172094A (en) | Method for using waste aluminum ash and waste acid without causing pollution to environment | |
| WO2011101948A1 (en) | Washing method and washing system for incineration ash and dust in combustion gas extracted from cement kiln | |
| CN104611564A (en) | Method for recycling metal oxides from waste SCR (selective catalytic reduction) catalyst | |
| CN103043714A (en) | Tubular membrane device applicable to titanium dioxide washing and washing method | |
| CN102583540A (en) | Method for preparing chrome oxide black and co-producing ferrous oxalate by utilizing chrome-containing cast iron acid dissolution | |
| JP2011073965A (en) | Method for manufacturing zinc oxide powder by recycling zinc-containing waste acid | |
| Muthukumar et al. | Selective recovery of vanadium as AMV from calcium vanadate sludge by direct AS leaching process: an industrial approach | |
| CN103818969A (en) | Iron oxide red and preparation method thereof | |
| CN203333413U (en) | System for comprehensively utilizing wastewater generated during production of polyvinyl chloride (PVC) production by calcium carbide method | |
| JP7117325B2 (en) | Method for producing vanadate | |
| JP4986958B2 (en) | Water washing method and water washing system for incineration ash and cement kiln combustion gas extraction dust | |
| CN103498047A (en) | Process for extracting vanadium through alkaline leaching conducted after stone coal oxidizing roasting | |
| JP2012035220A (en) | Waste treating method | |
| CN102716616A (en) | Filter aid used in leaf filtering process of sodium aluminate solution | |
| CN103014332B (en) | Pretreatment method for extracting molybdenum from molybdenum ore | |
| CN203079706U (en) | Device applied to metatitanic acid washing working section | |
| CN103214040A (en) | Comprehensive utilization method of rice hull ash | |
| JP6610855B2 (en) | Processing method of heavy metal treatment material and heavy metal containing fly ash cleaning liquid | |
| CN104086168B (en) | What utilize production hydroquinones to produce contains manganese waste liquid and the clay method of getting soft magnetic manganese zinc iron compound material of zinc |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130724 |