CN101811090B - Magnetic selection method for electrolytic aluminum waste material - Google Patents
Magnetic selection method for electrolytic aluminum waste material Download PDFInfo
- Publication number
- CN101811090B CN101811090B CN2010101684039A CN201010168403A CN101811090B CN 101811090 B CN101811090 B CN 101811090B CN 2010101684039 A CN2010101684039 A CN 2010101684039A CN 201010168403 A CN201010168403 A CN 201010168403A CN 101811090 B CN101811090 B CN 101811090B
- Authority
- CN
- China
- Prior art keywords
- waste material
- electrolytic aluminum
- magnetic
- selection method
- aluminum waste
- 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.)
- Active
Links
Abstract
The invention discloses a magnetic selection method for an electrolytic aluminum waste material. The electrolytic aluminum waste material is subjected to wet-type breakage and floating selection. The method is characterized by comprising the following steps of: adding a reducing agent into the electrolytic aluminum waste material; converting the surface of a hematite-contained particle in the waste material into magnetite; and removing ferrum and silicon in magnetic selecting equipment and separating to obtain carbon powder and other raw materials. The hematite (Fe2O3) on the surface of an impurity particle is converted into the magnetite (F3O4) with strong magnetism by utilizing the trace reducing agent in the process of floating selection, the effect of the magnetic selection is greatly improved, and the effect of a gradient magnetic separator can be achieved by adopting a common magnetic separator. Then, the initially separated carbon powder is subjected to alkali type dissolving, the cryolite (Na3AlF6) is separated, and the processed carbon powder (ash content being 1-2 percent) reaches the grade of high-purity carbon powder and greatly improves the market value of products.
Description
Technical field
The present invention relates to a kind of magnetic selection method for electrolytic aluminum waste material, belong to electrolytic aluminum scraps recovery technology field.
Background technology
Electrolytic aluminum scraps comprises: based on dirty material of the aluminium oxide of fluoro-containing alumina and pallet material; Pinkeye carbon slag based on fluoride salt; To contain the anode ash and the cathode block of carbon materials, owing to the complicated feasible separation of electrolytic aluminum scraps component, purification, synthetic very difficult to waste material; For a long time, conventional aluminum sparetime university state has all carried out big quantity research to the processing of electrolytic aluminum scraps as enterprises such as U.S., day, moral etc. and domestic large-scale state-owned aluminium manufacturer such as Guizhou, Xining, Fushun, but because the correlation technique bottleneck can't be broken through, so far do not build up effective resource recovery system, the mode of burning and burying is mainly still adopted in processing to electrolytic aluminum scraps, and environmental pollution is very big.
Simultaneously, in the metallic aluminium alloy, iron, formed thick, the hard crisp intermetallic compound of silicon are the main causes that reduces alloy fracture toughness, have a strong impact on aluminum product quality.
In the process of preparation aluminium oxide, part iron, sila matter are with Fe
2O
3, SiO
2Form have industrial Al
2O
3In, another source of iron and silicon is relevant with the fusion process of alloy, liquid aluminium can with SiO in the furnace lining
2, Fe
2O
3, effect such as FeO, generate corresponding simple substance and oxide, these impurity are partly removed in smelting process and enter waste material.Therefore, iron that exists in the waste material and silicon and other impurity elements can't be eliminated, and are the critical problems of restriction electrolytic aluminium solid waste resource reusing.
The constituent of electrolytic aluminium solid waste roughly comprises 40% carbon and other waste materials of 60%, utilizes " hydrophobicity " of carbon to adopt the method for flotation can isolate carbon dust.But, mainly contain the ice crystal (Na of iron, silicon, 6%-12% in the isolated carbon dust
3AlF
6), iron and silicon are that objectionable impurities must be removed, ice crystal (Na
3AlF
6But) be the reuse product, if can not separate, purify, then can't reach industrial application requirements, can only sell as general combustion adjuvant, market value is very low.
In the prior art, to impurity such as the iron in the electrolytic aluminum scraps, silicon, the one, remove de-iron (Fe) by the chemical industry method, iron in the waste material has considerable part to exist with the fluoride salt form of iron, and the high stability that fluoride salt had is the key technology bottleneck of restriction with the deironing of chemical industry method, even if the effectively deironing of existing chemical industry method is also often because its economic worth that loses with high costs.
The 2nd, by the mode separation of iron of magnetic separation, but the component complexity of electrolytic aluminium solid waste, common magnetic separator separating effect is bad, and gradient magnetic separation or superconducting magnetic separation machine equipment input are huge, and energy consumption is good, the cost height.
Summary of the invention
The objective of the invention is to, a kind of magnetic selection method for electrolytic aluminum waste material is provided.Can meet or exceed the magnetic separation effect of gradient magnetic separator by common magnetic separator, effectively remove impurity such as iron in the electrolytic aluminum scraps, silicon, make final products purity reach the commercial Application rank, reduce production costs.
Technical scheme of the present invention.Magnetic selection method for electrolytic aluminum waste material passes through the wet type fragmentation with electrolytic aluminum scraps, by flotation; In electrolytic aluminum scraps, add reducing agent, the surface that contains the bloodstone particle in the waste material is converted into magnetic iron ore, in magnetic plant, remove impurity such as de-iron and silicon, separate obtaining carbon dust and all the other raw materials.
Above-mentioned magnetic selection method for electrolytic aluminum waste material, described reducing agent are sodium dithionate, dithionic acid zinc or sodium borohydride.
Aforesaid magnetic selection method for electrolytic aluminum waste material, described reducing agent are sodium dithionate.
Aforesaid magnetic selection method for electrolytic aluminum waste material also comprises the carbon dust after flotation, the magnetic separation is put into alkali lye, carries out the stripping of alkali formula, and the carbon dust after the stripping is eliminated iron and silicon in the carbon dust once more once more by flotation, magnetic separation.
Aforesaid magnetic selection method for electrolytic aluminum waste material, described alkali lye are sodium hydroxide solution.
Technical scheme of the present invention is to utilize the extremely reducing agent of trace in floatation process, makes the bloodstone (Fe on impurity particle surface
2O
3) change into and have ferromagnetic magnetic iron ore (F
3O
4), greatly improved the effect of magnetic separation, adopt common magnetic separator can reach the effect of gradient magnetic separator.Then, the carbon dust after the initial gross separation is carried out the stripping of alkali formula, the ice crystal dissolving infiltrating in the carbon lattice utilizes the CO that produces in the product drying process again
2Ice crystal (Na is separated out in carbonization
3AlF
6), NaOH is transformed into Na
2CO
3Iron in the carbon dust (Fe) and silicon (Si) since fluoride to stick carrier destroyed, can be by carbon dust be carried out being eliminated behind the secondary flotation, carbon dust after the processing (ash content is 1%-2%), reach the rank of high pure carbon powder, can be used for the anode block production of electrolytic aluminium factory or be used for the electrode paste of ferroalloy works, greatly improved the market value of product.
The specific embodiment
Embodiments of the invention.Magnetic selection method for electrolytic aluminum waste material passes through the wet type fragmentation with electrolytic aluminum scraps, by flotation; In electrolytic aluminum scraps, add reducing agent, the particle surface that contains bloodstone in the waste material is converted into magnetic iron ore, in magnetic plant, remove impurity such as de-iron and silicon, separate obtaining carbon dust and all the other raw materials.By flotation, magnetic separation, can separate the carbon dust that accounts for waste material weight about 40%, mainly contain aluminium oxide, ice crystal in the remaining raw material, and trace meter aluminium, also have impurity such as iron, silicon.Magnetic plant adopts existing magnetic separator.
The reducing agent that adopts can be sodium dithionate, dithionic acid zinc or sodium borohydride etc., and reducing agent is with the bloodstone (Fe in the waste material
2O
3) be converted into magnetic iron ore (F
3O
4), the efficient of raising magnetic separator.Through test, because only use bloodstone to be converted into magnetic iron ore, just impurity iron can be selected by magnetic separator the surface, therefore only use the reducing agent that adds about 5g for 1 ton, consumption is seldom.
Test through the applicant; the reducing agent sodium dithionate that adopts is that a kind of of comparatively suitable this technology---sodium dithionate is a unstable compound; resolve into sodium sulfite and NaOH easily; the circulation that is used for this process using aluminum electrolysis technology is carried out flotation; because the sodium dithionate decomposition can make recirculated water progressively become about alkaline PH10; more serious to corrosion such as equipment pipes; but in the flue dust drip washing recovery system of aluminum electrolysis technology, can be recovered to hydrogen fluoride (HF); enter recirculated water after HF is water-soluble; the NaOH in the recirculated water has neutralized; PH is bordering between the 7-8; protected equipment, so sodium dithionate is a kind of reducing agent that comparatively is fit to this technology.
Carbon dust after flotation, the magnetic separation is put into alkali lye, carry out the stripping of alkali formula, the carbon dust after the stripping is eliminated iron and silicon in the carbon dust once more once more by flotation, magnetic separation.
In the carbon dust after flotation for the first time, the magnetic separation, except main matter carbon, also contain impurity such as iron and silicon, and the ice crystal (Na of 6%-12% by weight
3AlF
6), therefore can also further separate: the carbon dust after the flotation is carried out the stripping of alkali formula, carbon dust is put into the alkali lye stripping, fluoride in the dissolving carbon dust, add carbon dioxide then, separate out ice crystal, because that fluoride sticks carrier is destroyed, separate out carbon dust behind the ice crystal once more by flotation, magnetic separation, eliminate iron and silicon in the carbon dust once more.The carbon dust ash content that obtains is 1%-2%, reaches the rank of high pure carbon powder.Described alkali lye is sodium hydroxide solution (pH value 14).Carry out the product lab scale through the applicant, the ice crystal of separating out is that purity is up to state standards, promptly 99.99%.
Claims (5)
1. a magnetic selection method for electrolytic aluminum waste material passes through the wet type fragmentation with electrolytic aluminum scraps, by flotation; It is characterized in that: in electrolytic aluminum scraps, add reducing agent, the surface that contains the bloodstone particle in the waste material is converted into magnetic iron ore, in magnetic plant, remove de-iron and silicon, separate obtaining carbon dust and all the other raw materials.
2. magnetic selection method for electrolytic aluminum waste material according to claim 1 is characterized in that: described reducing agent is sodium dithionate, dithionic acid zinc or sodium borohydride.
3. magnetic selection method for electrolytic aluminum waste material according to claim 1 is characterized in that: described reducing agent is a sodium dithionate.
4. magnetic selection method for electrolytic aluminum waste material according to claim 1 is characterized in that: also comprise the carbon dust after flotation, the magnetic separation is put into alkali lye, carry out the stripping of alkali formula, the carbon dust after the stripping is eliminated iron and silicon in the carbon dust once more once more by flotation, magnetic separation.
5. magnetic selection method for electrolytic aluminum waste material according to claim 4 is characterized in that: described alkali lye is sodium hydroxide solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101684039A CN101811090B (en) | 2010-05-11 | 2010-05-11 | Magnetic selection method for electrolytic aluminum waste material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101684039A CN101811090B (en) | 2010-05-11 | 2010-05-11 | Magnetic selection method for electrolytic aluminum waste material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101811090A CN101811090A (en) | 2010-08-25 |
| CN101811090B true CN101811090B (en) | 2011-11-09 |
Family
ID=42618542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101684039A Active CN101811090B (en) | 2010-05-11 | 2010-05-11 | Magnetic selection method for electrolytic aluminum waste material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101811090B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102559225B (en) * | 2011-12-05 | 2016-11-23 | 周俊和 | The method of processing coke by electrolytic aluminium waste and special purpose device |
| CN102530966A (en) * | 2011-12-15 | 2012-07-04 | 邹建明 | Method for recycling coal ashes in power plant |
| CN103949460A (en) * | 2014-04-17 | 2014-07-30 | 建水德福再生资源利用有限公司 | Device and method for producing regenerative electrolyte from aluminum-electrolysis carbon residues |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4059672A (en) * | 1973-04-02 | 1977-11-22 | Revere Copper And Brass Incorporated | Method of digesting bauxite via the Bayer process with the addition of reducing agents |
| US4803061A (en) * | 1986-12-29 | 1989-02-07 | Texaco Inc. | Partial oxidation process with magnetic separation of the ground slag |
| EP0931593B1 (en) * | 1998-01-23 | 2003-07-30 | Hitachi, Ltd. | Waste solid treatment apparatus |
| CN1995412A (en) * | 2006-12-09 | 2007-07-11 | 周耀瑜 | Environment-friendly type alumyte integrated smelting technology |
| CN101437759A (en) * | 2006-05-04 | 2009-05-20 | 克劳泽-勒姆-系统股份公司 | Method for obtaining magnetite |
-
2010
- 2010-05-11 CN CN2010101684039A patent/CN101811090B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4059672A (en) * | 1973-04-02 | 1977-11-22 | Revere Copper And Brass Incorporated | Method of digesting bauxite via the Bayer process with the addition of reducing agents |
| US4803061A (en) * | 1986-12-29 | 1989-02-07 | Texaco Inc. | Partial oxidation process with magnetic separation of the ground slag |
| EP0931593B1 (en) * | 1998-01-23 | 2003-07-30 | Hitachi, Ltd. | Waste solid treatment apparatus |
| CN101437759A (en) * | 2006-05-04 | 2009-05-20 | 克劳泽-勒姆-系统股份公司 | Method for obtaining magnetite |
| CN1995412A (en) * | 2006-12-09 | 2007-07-11 | 周耀瑜 | Environment-friendly type alumyte integrated smelting technology |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101811090A (en) | 2010-08-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101818253B (en) | Separation and purification method of electrolytic aluminum scraps | |
| CN101804996B (en) | Method for recovering sodium fluoride from electrolytic aluminum waste cathode carbon block | |
| CN101817526B (en) | Method for recovering polyethylene glycol and silicon carbide from silicon crystal cutting waste liquid | |
| CN110407190B (en) | Method for recycling carbon from waste aluminum electrolysis cathode | |
| CN102976374B (en) | Conversion method of iron minerals in production process of alumina | |
| CN108893615A (en) | A method of metallic aluminium is recycled from aluminium ash | |
| CN101886179A (en) | Method for separating ferrum, copper and silicon components from copper smelting residues | |
| CN111792650A (en) | Full-element recycling process of coal ash or coal gangue by hot-melt salt method | |
| CN102010991A (en) | Method for extracting lithium salt and removing potassium from lithium mica raw material | |
| US20220144658A1 (en) | Method for preparing aluminum fluoride and aluminum oxide by decarburization and sodium removal of aluminum electrolysis carbon residue | |
| CN100417475C (en) | Production of metal zinc powder from zinc dust and zinc dross | |
| CN106399693A (en) | Overall treatment and utilization method for aluminum ash | |
| CN101811090B (en) | Magnetic selection method for electrolytic aluminum waste material | |
| CN104004919A (en) | Environment-friendly recycling process of waste residues in electrolytic manganese production | |
| CN110408794A (en) | Asbestos deposit process for cleanly preparing | |
| CN101817521A (en) | Alkali-type dissolving method of carbon powder in electrolytic aluminum scraps | |
| CN102897816A (en) | Deep recycling method of red mud | |
| CN103539182B (en) | Method for preparing aluminum chloride hexahydrate by using pulverized fuel ash as raw material through ferrous chloride induced crystallization | |
| CN101333605A (en) | Technology for extracting indium from indium-rich bottom lead | |
| CN212532311U (en) | System for gangue production aluminium oxide | |
| CN105018739A (en) | Efficient and comprehensive aluminium ash recycling method | |
| CN108425017B (en) | The method of valuable metal is recycled from copper indium gallium selenide refuse battery chip | |
| CN105219957A (en) | A kind of method of Selectively leaching vanadium from bone coal roasting material | |
| CN109680158A (en) | A method of Titanium or titanium white are prepared using titanium-contained slag | |
| CN102580858B (en) | Composite collector for recovering manganese carbonate from carbonaceous rhodochrosite and flotation method for composite collector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZOU JIANMING Free format text: FORMER OWNER: GUIZHOU LVCHENG ALUMINUM MATERIAL RESEARCH AND DEVELOPMENT CO., LTD. Effective date: 20130712 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 550058 GUIYANG, GUIZHOU PROVINCE TO: 550014 GUIYANG, GUIZHOU PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20130712 Address after: 1, unit 3, building 99, 550014 Yucai Road, Baiyun District, Guizhou, Guiyang, 601 Patentee after: Zou Jianming Address before: 550058 Guizhou Province, Guiyang Baiyun District of Baba Ao Patentee before: Guizhou Lvcheng Raw Material of Aluminum Research and Development Co., Ltd. |
|
| ASS | Succession or assignment of patent right |
Owner name: WANG GANG Free format text: FORMER OWNER: ZOU JIANMING Effective date: 20130806 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 550014 GUIYANG, GUIZHOU PROVINCE TO: 102200 CHANGPING, BEIJING |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20130806 Address after: 102200, Beijing, Huilongguan, Changping District, Yue long, four, 3-1-4-501 Patentee after: Wang Gang Address before: 1, unit 3, building 99, 550014 Yucai Road, Baiyun District, Guizhou, Guiyang, 601 Patentee before: Zou Jianming |
|
| ASS | Succession or assignment of patent right |
Owner name: GUIZHOU LVCHENG ALUMINUM MATERIAL RESEARCH AND DEV Free format text: FORMER OWNER: WANG GANG Effective date: 20131008 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 102200 CHANGPING, BEIJING TO: 550014 GUIYANG, GUIZHOU PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20131008 Address after: 550014, Guizhou Guiyang Baiyun District aluminum and aluminum processing base, East Ring Road Aluminum City Aluminum Patentee after: Guizhou Lvcheng Raw Material of Aluminum Research and Development Co., Ltd. Address before: 102200, Beijing, Huilongguan, Changping, Yue long, four, 3-1-4-501 Patentee before: Wang Gang |
|
| ASS | Succession or assignment of patent right |
Owner name: ZOU JIANMING Free format text: FORMER OWNER: GUIZHOU LVCHENG ALUMINUM MATERIAL RESEARCH AND DEVELOPMENT CO., LTD. Effective date: 20131119 Owner name: DU YANHUA Effective date: 20131119 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20131119 Address after: 1, unit 3, building 99, 550014 Yucai Road, Baiyun District, Guizhou, Guiyang, 601 Patentee after: Zou Jianming Patentee after: Du Yanhua Address before: 550014, Guizhou Guiyang Baiyun District aluminum and aluminum processing base, East Ring Road Aluminum City Aluminum Patentee before: Guizhou Lvcheng Raw Material of Aluminum Research and Development Co., Ltd. |
|
| PP01 | Preservation of patent right |
Effective date of registration: 20140926 Granted publication date: 20111109 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20150326 Granted publication date: 20111109 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151009 Address after: No. 40, hawthorn alley, Yunyan District, Guiyang Patentee after: Zhou Junhe Patentee after: Du Yanhua Address before: 1, unit 3, building 99, 550014 Yucai Road, Baiyun District, Guizhou, Guiyang, 601 Patentee before: Zou Jianming Patentee before: Du Yanhua |