CN102531440A - Method for recycling red mud - Google Patents
Method for recycling red mud Download PDFInfo
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- CN102531440A CN102531440A CN2011104197871A CN201110419787A CN102531440A CN 102531440 A CN102531440 A CN 102531440A CN 2011104197871 A CN2011104197871 A CN 2011104197871A CN 201110419787 A CN201110419787 A CN 201110419787A CN 102531440 A CN102531440 A CN 102531440A
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- red mud
- brick
- recycled
- magnetic separation
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a method for recycling red mud to pulp the red mud. The method is characterized in that a reducing agent is added into the red mud, iron-containing particles in the red mud are reduced into magnetite particles, and then the magnetite particles are subjected to magnetic separation to obtain an iron-containing product A; and then the red mud subjected to the magnetic separation is used to prepare a baked brick product B. The applicant summarizes a set of method for preparing the baked brick, wherein a brick body prepared by the red mud is put into a mixed liquor of sodium silicate solution and barium sulfate, and then is blown to be dry by carbon dioxide, then a layer of barium sulfate protection film is covered on the surface of the brick body to shield the radioactivity. According to the method for recycling the red mud, the construction wastes being waste materials are added as aggregate, so that the strength of the brick body is improved, the fusion points of refractory materials can be reduced by adding a little fluoride salt, and various construction wastes and the red mud can be sintered together at a lower temperature.
Description
Technical field
The present invention relates to the method that a kind of red mud is recycled, belong to red mud recovery and utilization technology field.
Background technology
The contaminative waste residue of discharging when red mud is Aluminium industry extraction aluminum oxide, 1 ton of aluminum oxide of the every production of average, 1.0～2.0 tons of red muds of subsidiary generation.The red mud of the annual discharging of China is up to millions of tons.Because complicated component in the red mud, separation is difficult for, and the red mud of certain areas also has radioactivity; Therefore red mud is normally set up special-purpose red mud field and is stacked, and not only needs certain capital cost, and takies a large amount of soils; Objectionable impurities is wherein infiltrated in the end, ground or the water, serious environment pollution, and make the composition many capable of using in the red mud can not get reasonable utilization; Cause the secondary waste of resource, serious obstruction the Sustainable development of aluminium industry.
Summary of the invention
The objective of the invention is to the method that provides a kind of red mud to recycle.Can the iron in the red mud be reclaimed,, prepare vitrified brick, solve red mud objectionable impurities and radioactive problem in conjunction with building waste.Add micro-fluoride salt, utilize fluoride salt can significantly reduce the characteristics of melting point substance, the sintering temperature that at first can reduce brickmaking reaches purpose of energy saving, and secondly fluoride salt makes that inner each substance crystallization bridging of brick is more abundant, makes that the intensity of brick is better.
Technical scheme of the present invention.The method that red mud is recycled with the red mud making beating, adds reductive agent in red mud, the iron content particle in the red mud is reduced to magnetite ore particles, obtains iron-containing product A through magnetic separation; Red mud after the magnetic separation prepares the vitrified brick product B.
The method that above-mentioned red mud is recycled; It is following that said vitrified brick product B prepares process; Red mud is obtained the brick body according to existing prepared, the brick body is immersed in the mixed solution of sodium silicate solution and permanent white, take out the back and dry up the brick surface through dioxide gas; Make the brick surface form layer protecting film, obtain the vitrified brick product B.
The method that above-mentioned red mud is recycled; Red mud after the magnetic separation is carried out sedimentation, and to be concentrated into water ratio be 20-30%, with construction waste crushing to granularity≤3mm, the red mud after the magnetic separation of 20-50 part and 50-80 part building waste and 0.05-0.3 part fluoride salt mixed stirring after; Process adobe through brick press; Reburning makes the brick body, the brick body is immersed in the mixed solution of sodium silicate solution and permanent white, takes out the back and dries up the brick surface through dioxide gas; Make the brick surface form layer protecting film, obtain the vitrified brick product B.
The method that above-mentioned red mud is recycled, the proportioning of said brick-making raw material is the red mud after the magnetic separation of 30-40 part and 60-70 part building waste and 0.1-0.2 part fluoride salt.
The method that above-mentioned red mud is recycled, the proportioning of said mixed solution is 70-90 part sodium silicate solution and 10-30 part permanent white.
The method that above-mentioned red mud is recycled, said fluoride salt is the hexafluoro sodium aluminate.
The method that above-mentioned red mud is recycled, said reductive agent is sodium hyposulfate, dithionic acid zinc or Peng Qinghuana.
Guizhou aluminium manufacturer red mud analysis on Content is found that the iron content component content contains objectionable impurities arsenic in this red mud about 15%, and radioactivity (IRa and Ir are greater than 2.0Bq/kg) is arranged.The present invention passes through in red mud, to add the reductive agent of trace, magnetite is changed into have ferromagnetic magnetite, has improved the effect of magnetic separation, can effectively the iron that contains in the red mud be selected, and sells as iron-smelting raw material.In order further to utilize the red mud after the magnetic separation, eliminate arsenic and radioactive harm in the red mud, the applicant has carried out a series of researchs and experiment; Discovery with red mud through roasting; After being prepared into vitrified brick, can objectionable impuritiess such as arsenic be cured in the brick body, avoid the diffusion of objectionable impurities.And permanent white can shield radioactivity; Therefore the applicant sums up the preparation method of a cover vitrified brick, and the brick body of red mud preparation is put into the mixed solution of sodium silicate solution and permanent white, dries up through carbonic acid gas again; Cover one deck permanent white protective membrane in the brick surface, shield its radioactivity.Through applicant's experiment, the vitrified brick radioactivity IRa of preparation and Ir are lower than the radioactive requirement of construction main body material all less than 1.0Bq/kg, and product reaches GBT5101-1998 fired common brick standard.The present invention is that the building waste of waste material is as aggregate through adding equally; Can improve the intensity of brick body, the building waste of employing mainly refers to concrete, lime, sandstone, dregs, broken ceramic tile etc., its complicated component and have the HMP material; With directly brickmaking is bigger after its broken slurrying; Therefore add micro-fluoride salt again, can reduce the fusing point of infusibility material, can under lower temperature, various building wastes and red mud sintering be in the same place.Fluoride salt adopts hexafluoro sodium aluminate (sodium aluminum fluoride), can from the aluminum electrolysis technology waste material, reclaim, and reduces production costs.
Embodiment
Embodiments of the invention 1.The method that red mud is recycled is mixed red mud and water, and making beating adds reductive agent in red mud slurries, the iron content particle in the red mud is reduced to magnetite ore particles, obtains iron-containing product A through magnetic separation.Iron-containing product A composition is mainly magnetite, can be used as iron-smelting raw material and sells.The reductive agent that adopts is sodium hyposulfate, dithionic acid zinc or Peng Qinghuana.
Red mud after the magnetic separation can prepare the vitrified brick product B; It is following that the vitrified brick product B prepares process; Red mud is obtained the brick body according to existing prepared, the brick body is immersed in the mixed solution of sodium silicate solution and permanent white, take out the back and dry up the brick surface through dioxide gas; Make the brick surface form layer protecting film, obtain the vitrified brick product B.Sodium silicate solution is commonly called as water glass, and permanent white is processed the powdery that granularity is 200-400, by weight, and with obtaining mixed solution behind 10-30 part permanent white and the 70-90 part sodium silicate solution thorough mixing.Red mud can directly prepare vitrified brick, also can add refabrication vitrified brick behind the other materials according to prior art.
Embodiments of the invention 2.The method that red mud is recycled with the red mud making beating, adds reductive agent in red mud slurries, the iron content particle in the red mud is reduced to magnetite ore particles, obtains iron-containing product A through magnetic separation.The preferred sodium hyposulfate of reductive agent that adopts.
Red mud after the magnetic separation advanced sedimentation, and to be concentrated into water ratio be 20-30%; Construction waste crushing to granularity≤3mm, after the red mud after the magnetic separation of 20-50 part and 50-80 part building waste and 0.05-0.3 part fluoride salt mixing stirring, is processed adobe through brick press; Reburn and make the brick body; The brick body that bakes is immersed in the mixed solution of sodium silicate solution and permanent white, soak into the brick surface and get final product, take out the back and dry up the brick surface through dioxide gas; Make the brick surface form layer protecting film, obtain the vitrified brick product B.Said fluoride salt can adopt fluoride salts such as hexafluoro sodium aluminate, Calcium Fluoride (Fluorspan), Sodium Fluoride or ALUMNIUM FLUORIDE.
Wherein, mixed solution is that permanent white is processed granularity is 300 powdery, by weight, and with obtaining mixed solution behind 20 parts of permanent white and 80 parts of sodium silicate solution thorough mixing.
Embodiments of the invention 3.The method that red mud is recycled with the red mud making beating, adds dithionic acid zinc in red mud slurries, the iron content particle in the red mud is reduced to magnetite ore particles, obtains iron-containing product A through magnetic separation.
Red mud after the magnetic separation advanced sedimentation, and to be concentrated into water ratio be 25%; With construction waste crushing to granularity≤3mm, with the red mud after 35 parts of magnetic separation and 65 parts of building wastes and 0.1 part of hexafluoro sodium aluminate mix stir after, process adobe through brick press; Reburn and make the brick body; The brick body that bakes is immersed in the mixed solution of sodium silicate solution and permanent white, soak into the brick surface, dry up the brick surface through dioxide gas behind the taking-up brick body; Make the brick surface form layer protecting film, obtain the vitrified brick product B.The preferred hexafluoro sodium aluminate of fluoride salt obtains because can from the waste material of aluminum electrolysis, reclaim, and can reduce cost.
Embodiments of the invention 4.The method that red mud is recycled with the red mud making beating, adds dithionic acid zinc in red mud slurries, the iron content particle in the red mud is reduced to magnetite ore particles, obtains iron-containing product A through magnetic separation.
Red mud after the magnetic separation advanced sedimentation, and to be concentrated into water ratio be 23-27%; Construction waste crushing to granularity≤3mm, after the red mud after the magnetic separation of 30-40 part and 60-70 part building waste and 0.1-0.2 part fluoride salt mixing stirring, is processed adobe through brick press; Reburn and make the brick body; The brick body that bakes is immersed in the mixed solution of sodium silicate solution and permanent white, soak into the brick surface, dry up the brick surface through dioxide gas behind the taking-up brick body; Make the brick surface form layer protecting film, obtain the vitrified brick product B.
Claims (7)
1. the method that red mud is recycled with the red mud making beating, is characterized in that, in red mud, adds reductive agent, and the iron content particle in the red mud is reduced to magnetite ore particles, obtains iron-containing product A through magnetic separation; Red mud after the magnetic separation prepares the vitrified brick product B.
2. the method that red mud according to claim 1 is recycled; It is characterized in that: it is following that said vitrified brick product B prepares process; Red mud fired by existing technology obtain the brick body, the brick body is immersed in the mixed solution of sodium silicate solution and permanent white, take out and then dries up the brick surface through dioxide gas; Make the brick surface form layer protecting film, obtain product B.
3. the method that red mud according to claim 2 is recycled; It is characterized in that: the red mud after the magnetic separation is carried out sedimentation, and to be concentrated into water ratio be 20-30%, with construction waste crushing to granularity≤3mm, the red mud after the magnetic separation of 20-50 part and 50-80 part building waste and 0.05-0.3 part fluoride salt mixed stirring after; Process adobe through brick press; Reburning makes the brick body, the brick body is immersed in the mixed solution of sodium silicate solution and permanent white, takes out the back and dries up the brick surface through dioxide gas; Make the brick surface form layer protecting film, obtain the vitrified brick product B.
4. the method that red mud according to claim 3 is recycled, it is characterized in that: by weight, the proportioning of said brick-making raw material is the red mud after the magnetic separation of 30-40 part and 60-70 part building waste and 0.1-0.2 part fluoride salt.
5. the method that red mud according to claim 3 is recycled, it is characterized in that: by weight, the proportioning of said mixed solution is 70-90 part sodium silicate solution and 10-30 part permanent white.
6. the method that red mud according to claim 3 is recycled, it is characterized in that: said fluoride salt is the hexafluoro sodium aluminate.
7. the method that red mud according to claim 1 is recycled, it is characterized in that: said reductive agent is sodium hyposulfate, dithionic acid zinc or Peng Qinghuana.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110419787.1A CN102531440B (en) | 2011-12-15 | 2011-12-15 | The method that red mud is recycled |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110419787.1A CN102531440B (en) | 2011-12-15 | 2011-12-15 | The method that red mud is recycled |
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| Publication Number | Publication Date |
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| CN102531440A true CN102531440A (en) | 2012-07-04 |
| CN102531440B CN102531440B (en) | 2015-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110419787.1A Expired - Fee Related CN102531440B (en) | 2011-12-15 | 2011-12-15 | The method that red mud is recycled |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103131214A (en) * | 2013-02-05 | 2013-06-05 | 茌平县金德赤泥资源再利用有限公司 | Technological method of using alumina byproduct red mud for producing polyvinyl chloride (PVC) packing |
| CN103319150A (en) * | 2013-05-31 | 2013-09-25 | 贵州大学 | High-doping ratio red mud sintered brick and preparation method thereof |
| CN111908815A (en) * | 2019-05-08 | 2020-11-10 | 山东理工大学 | Red mud machine-made sand and preparation method thereof |
| CN111943534A (en) * | 2020-09-02 | 2020-11-17 | 陶予敏 | Process for preparing portland cement by utilizing red mud |
| CN113982179A (en) * | 2021-11-15 | 2022-01-28 | 宁乡宁华新材料有限公司 | Heat-insulating environment-friendly baking-free brick and preparation method thereof |
| CN114031355A (en) * | 2021-11-25 | 2022-02-11 | 山东汉博昱洲新材料有限公司 | Porous phase material composite red mud brick and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1098965A (en) * | 1993-08-14 | 1995-02-22 | 赣州有色冶金研究所 | A kind of method that from the bauxite stripping waste residue, reclaims iron mineral |
| CN1420097A (en) * | 2002-12-17 | 2003-05-28 | 昆明理工大学 | Technique for producing non-extrusion clayless solid slag sintering brick |
| CN1743472A (en) * | 2005-09-22 | 2006-03-08 | 贵阳铝镁设计研究院 | Method for recovering iron from red mud |
| CN101413054A (en) * | 2008-12-09 | 2009-04-22 | 中南大学 | Technology for comprehensively utilizing high ferro aluminiferous material |
-
2011
- 2011-12-15 CN CN201110419787.1A patent/CN102531440B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1098965A (en) * | 1993-08-14 | 1995-02-22 | 赣州有色冶金研究所 | A kind of method that from the bauxite stripping waste residue, reclaims iron mineral |
| CN1420097A (en) * | 2002-12-17 | 2003-05-28 | 昆明理工大学 | Technique for producing non-extrusion clayless solid slag sintering brick |
| CN1743472A (en) * | 2005-09-22 | 2006-03-08 | 贵阳铝镁设计研究院 | Method for recovering iron from red mud |
| CN101413054A (en) * | 2008-12-09 | 2009-04-22 | 中南大学 | Technology for comprehensively utilizing high ferro aluminiferous material |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103131214A (en) * | 2013-02-05 | 2013-06-05 | 茌平县金德赤泥资源再利用有限公司 | Technological method of using alumina byproduct red mud for producing polyvinyl chloride (PVC) packing |
| CN103131214B (en) * | 2013-02-05 | 2016-06-29 | 茌平县金德赤泥资源再利用有限公司 | Aluminium oxide by-product red mud is utilized to produce the process of PVC filler |
| CN103319150A (en) * | 2013-05-31 | 2013-09-25 | 贵州大学 | High-doping ratio red mud sintered brick and preparation method thereof |
| CN103319150B (en) * | 2013-05-31 | 2015-03-25 | 贵州大学 | High-doping ratio red mud sintered brick and preparation method thereof |
| CN111908815A (en) * | 2019-05-08 | 2020-11-10 | 山东理工大学 | Red mud machine-made sand and preparation method thereof |
| CN111943534A (en) * | 2020-09-02 | 2020-11-17 | 陶予敏 | Process for preparing portland cement by utilizing red mud |
| CN113982179A (en) * | 2021-11-15 | 2022-01-28 | 宁乡宁华新材料有限公司 | Heat-insulating environment-friendly baking-free brick and preparation method thereof |
| CN114031355A (en) * | 2021-11-25 | 2022-02-11 | 山东汉博昱洲新材料有限公司 | Porous phase material composite red mud brick and preparation method thereof |
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| CN102531440B (en) | 2015-08-26 |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
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| ASS | Succession or assignment of patent right |
Owner name: GUIZHOU LVSHUI QINGSHAN ENVIRONMENTAL TECHNOLOGY C Free format text: FORMER OWNER: ZOU JIANMING Effective date: 20130418 Free format text: FORMER OWNER: RUAN ZHENGLIN Effective date: 20130418 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20130418 Address after: 550014, Guizhou Guiyang Baiyun District aluminum and aluminum processing base, East Ring Road Aluminum City Aluminum Applicant after: Guizhou Lvshui Qingshan Environmental Protection Technology Co., Ltd. Address before: 1, unit 3, building 99, 550014 Yucai Road, Baiyun District, Guizhou, Guiyang, 601 Applicant before: Zou Jianming Applicant before: Ruan Zhenglin |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150826 Termination date: 20151215 |
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| EXPY | Termination of patent right or utility model |