CN101817521A - Alkali-type dissolving method of carbon powder in electrolytic aluminum scraps - Google Patents
Alkali-type dissolving method of carbon powder in electrolytic aluminum scraps Download PDFInfo
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- CN101817521A CN101817521A CN 201010167728 CN201010167728A CN101817521A CN 101817521 A CN101817521 A CN 101817521A CN 201010167728 CN201010167728 CN 201010167728 CN 201010167728 A CN201010167728 A CN 201010167728A CN 101817521 A CN101817521 A CN 101817521A
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- alkali
- carbon powder
- carbon dust
- electrolytic aluminum
- aluminum scraps
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Abstract
The invention discloses an alkali-type dissolving method of carbon powder in electrolytic aluminum scraps, characterized by comprising the following steps: crushing electrolytic aluminum scraps in a wet type, floating and magnetically separating to remove iron and silicon and obtain carbon powder A; putting the carbon powder A in an alkali solution to dissolve; dissolving fluoride in the carbon powder A; and then, adding carbon dioxide to separate out cryolite B. The invention adopts the technical scheme that the theory that fluoride has a certain solubility in caustic soda is utilized to design an alkali-method process, i.e. carbon powder primarily separated at normal pressure is dissolved in an alkali type, and CO2 generated in the product-drying process is utilized to carbonize so as to separate out the cryolite. Tested by the proposer to the product, high-purity cryolite achieving the national standard can be obtained. Iron and silicon in the carbon powder can be eliminated by the secondary floatation of the carbon powder because the fluoride carrier is damaged, and the processed carbon powder (with 1-2 percent of ash content) can reach a high-purity carbon powder level.
Description
Technical field
The present invention relates to the alkali-type dissolving method of carbon dust in a kind of electrolytic aluminum scraps, belong to electrolytic aluminum scraps recovery technology field.
Background technology
Electrolytic aluminum scraps comprises: based on dirty material of the aluminum 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 to reduce alloy fracture flexible major cause, have a strong impact on aluminum product quality.
In the process of preparation aluminum 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 compound, 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 aluminum solid waste resource reusing.
Moreover China does not formulate the recovery standard to electrolytic aluminum scraps, has brought the impurity component that can not estimate when making waste recovery into, has increased intractability.
The moiety of electrolytic aluminum solid waste roughly can be divided into carbon 40% and add other waste materials 60%, utilizes " hydrophobicity " of carbon to adopt the method for flotation can isolate carbon dust.But, mainly contain the sodium aluminum fluoride (Na of iron, silicon, 6%-12% in the isolated carbon dust
3AlF
6), iron and silicon are that detrimental impurity must be removed, sodium aluminum fluoride (Na
3AlF
6But) be the reuse product, if can not separate, purify, then can't reach industrial application requirements, can only sell as general ignition dope, marketable value is very low.
Summary of the invention
The objective of the invention is to, the alkali-type dissolving method of carbon dust in a kind of electrolytic aluminum scraps is provided.Can purify to the carbon dust in the electrolytic aluminum scraps, improve the purity of carbon dust, and separate sodium aluminum fluoride wherein.
Technical scheme of the present invention.The alkali-type dissolving method of carbon dust comprises the steps: in the electrolytic aluminum scraps
A, with electrolytic aluminum scraps by the wet type fragmentation, by flotation and magnetic separation, remove de-iron and silicon, obtain carbon powder A;
B, carbon powder A is put into the alkali lye stripping, the fluorochemical in the dissolving carbon powder A adds carbonic acid gas then, separates out sodium aluminum fluoride B.
The alkali-type dissolving method of carbon dust in the above-mentioned electrolytic aluminum scraps, the carbon dust repeating step a that step b obtains eliminates iron and silicon in the carbon dust once more, obtains carbon dust C.
The alkali-type dissolving method of carbon dust in the aforesaid electrolytic aluminum scraps, described carbon dust C reaches the rank of high pure carbon powder.
The alkali-type dissolving method of carbon dust in the aforesaid electrolytic aluminum scraps, described sodium aluminum fluoride B is the sodium aluminum fluoride that purity is up to state standards.
The alkali-type dissolving method of carbon dust in the aforesaid electrolytic aluminum scraps, in step b, the alkali that is used for the stripping of alkali formula can recycle.
The alkali-type dissolving method of carbon dust in the aforesaid electrolytic aluminum scraps, in step b, the alkali that is used for the stripping of alkali formula is sodium hydroxide.
Technical scheme of the present invention is by utilizing fluorochemical to have certain deliquescent principle in caustic soda, design " alkaline process " technology, under normal pressure the carbon dust after the initial gross separation is carried out the stripping of alkali formula, utilizing the CO that produces in the product drying process again
2Sodium aluminum fluoride (Na is separated out in carbonization
3AlF
6).Carry out the product lab scale through the applicant, can obtain that purity is up to state standards, be i.e. high-purity sodium aluminum fluoride (Na of 99.99%
3AlF
6).Iron in the carbon dust (Fe) and silicon (Si) are because fluoride carrier is 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 marketable value of product.
Embodiment
Embodiments of the invention.The alkali-type dissolving method of carbon dust comprises the steps: in the electrolytic aluminum scraps
A, with electrolytic aluminum scraps by the wet type fragmentation, by floatation system, separate carbon dust, by magnetic plant, remove wherein part iron and silicon again, obtain carbon powder A.Also contain impurity such as iron and silicon in the isolated carbon powder A this moment, and the sodium aluminum fluoride (Na of 6%-12% by weight
3AlF
6).
B, carbon powder A is put into the alkali lye stripping, the fluorochemical in the dissolving carbon powder A adds carbonic acid gas then, separates out sodium aluminum fluoride B.Sodium aluminum fluoride B purity can reach 99.99%.
Through step b, iron in the carbon dust (Fe) and silicon (Si) with the carbon dust repeating step a that obtains, through flotation and magnetic separation, are eliminated iron and silicon in the carbon dust because fluoride carrier is destroyed once more, obtain carbon dust C.The carbon dust C ash content that obtains is 1%-2%, reaches the rank of high pure carbon powder.
In step b, the alkali that is used for the stripping of alkali formula is sodium hydroxide.During operation, the fluorochemical that is used for the carbon powder A of alkali formula stripping is dissolved in the NaOH solution, behind the adding carbonic acid gas, separates out sodium aluminum fluoride (Na
3AlF
6) and Na
2CO
3, use Ca (OH) again
2With Na
2CO
3Carry out causticizing reaction and produce CaCO
3Precipitation and NaOH solution, NaOH are realized recycling.
Claims (6)
1. the alkali-type dissolving method of carbon dust in the electrolytic aluminum scraps is characterized in that: comprise the steps:
A, with electrolytic aluminum scraps by the wet type fragmentation, by flotation and magnetic separation, remove de-iron and silicon, obtain carbon powder A;
B, carbon powder A is put into the alkali lye stripping, the fluorochemical in the dissolving carbon powder A adds carbonic acid gas then, separates out sodium aluminum fluoride B.
2. the alkali-type dissolving method of carbon dust in the electrolytic aluminum scraps according to claim 1 is characterized in that: the carbon dust repeating step a that step b obtains, eliminate iron and silicon in the carbon dust once more, and obtain carbon dust C.
3. according to the alkali-type dissolving method of carbon dust in the claim electrolytic aluminum scraps according to claim 2, it is characterized in that: described carbon dust C reaches the rank of high pure carbon powder.
4. according to the alkali-type dissolving method of carbon dust in the claim electrolytic aluminum scraps according to claim 1, it is characterized in that: described sodium aluminum fluoride B is the sodium aluminum fluoride that purity is up to state standards.
5. according to the alkali-type dissolving method of carbon dust in the claim electrolytic aluminum scraps according to claim 1, it is characterized in that: in step b, the alkali that is used for the stripping of alkali formula can recycle.
6. according to the alkali-type dissolving method of carbon dust in the claim electrolytic aluminum scraps according to claim 5, it is characterized in that: in step b, the alkali that is used for the stripping of alkali formula is sodium hydroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010167728 CN101817521A (en) | 2010-05-11 | 2010-05-11 | Alkali-type dissolving method of carbon powder in electrolytic aluminum scraps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010167728 CN101817521A (en) | 2010-05-11 | 2010-05-11 | Alkali-type dissolving method of carbon powder in electrolytic aluminum scraps |
Publications (1)
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|---|---|
| CN101817521A true CN101817521A (en) | 2010-09-01 |
Family
ID=42652825
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|---|---|---|---|
| CN 201010167728 Pending CN101817521A (en) | 2010-05-11 | 2010-05-11 | Alkali-type dissolving method of carbon powder in electrolytic aluminum scraps |
Country Status (1)
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|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102992298A (en) * | 2012-12-04 | 2013-03-27 | 贵州铝城铝业原材料研究发展有限公司 | Method for recycling overhauling slag waste cathode carbon blocks of electrolytic bath |
| CN102989744A (en) * | 2012-12-04 | 2013-03-27 | 贵州铝城铝业原材料研究发展有限公司 | Method for recycling mixed material dreg of overhauling groove slag of electrolytic cell |
| CN102992300A (en) * | 2012-12-04 | 2013-03-27 | 贵州铝城铝业原材料研究发展有限公司 | High temperature calcination method of electrolytic aluminum anode scrap residue |
| CN102992299A (en) * | 2012-12-04 | 2013-03-27 | 贵州铝城铝业原材料研究发展有限公司 | High temperature calcination method of electrolytic aluminum cathode scrap residue |
| CN105926007A (en) * | 2016-05-27 | 2016-09-07 | 中南大学 | Water leaching-flotation method for recovering carbons and electrolytes from waste cathode carbon blocks in aluminum electrolysis cell |
Citations (3)
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|---|---|---|---|---|
| US4053375A (en) * | 1976-07-16 | 1977-10-11 | Dorr-Oliver Incorporated | Process for recovery of alumina-cryolite waste in aluminum production |
| SU850588A1 (en) * | 1979-10-23 | 1981-07-30 | Иркутский Филиал Всесоюзного Научно- Исследовательского И Проектного Инсти-Тута Алюминиевой, Магниевой И Электрод-Ной Промышленности | Method of producing cryolite |
| CN101376518A (en) * | 2007-08-30 | 2009-03-04 | 多氟多化工股份有限公司 | Process for preparing kryocide |
-
2010
- 2010-05-11 CN CN 201010167728 patent/CN101817521A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4053375A (en) * | 1976-07-16 | 1977-10-11 | Dorr-Oliver Incorporated | Process for recovery of alumina-cryolite waste in aluminum production |
| SU850588A1 (en) * | 1979-10-23 | 1981-07-30 | Иркутский Филиал Всесоюзного Научно- Исследовательского И Проектного Инсти-Тута Алюминиевой, Магниевой И Электрод-Ной Промышленности | Method of producing cryolite |
| CN101376518A (en) * | 2007-08-30 | 2009-03-04 | 多氟多化工股份有限公司 | Process for preparing kryocide |
Non-Patent Citations (2)
| Title |
|---|
| 《有色金属》 20030331 李鸿 铝电解槽大修渣的污染防治及综合利用 92－94 1－6 第55卷, 2 * |
| 《预焙槽炼铝 第三版》 20050131 邱竹贤 预焙槽炼铝 冶金工业出版社 548－560 1－6 , 1 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102992298A (en) * | 2012-12-04 | 2013-03-27 | 贵州铝城铝业原材料研究发展有限公司 | Method for recycling overhauling slag waste cathode carbon blocks of electrolytic bath |
| CN102989744A (en) * | 2012-12-04 | 2013-03-27 | 贵州铝城铝业原材料研究发展有限公司 | Method for recycling mixed material dreg of overhauling groove slag of electrolytic cell |
| CN102992300A (en) * | 2012-12-04 | 2013-03-27 | 贵州铝城铝业原材料研究发展有限公司 | High temperature calcination method of electrolytic aluminum anode scrap residue |
| CN102992299A (en) * | 2012-12-04 | 2013-03-27 | 贵州铝城铝业原材料研究发展有限公司 | High temperature calcination method of electrolytic aluminum cathode scrap residue |
| CN102992300B (en) * | 2012-12-04 | 2016-08-10 | 周俊和 | A kind of High temperature calcination method of electrolytic aluminum anode scrap residue |
| CN102992298B (en) * | 2012-12-04 | 2016-08-10 | 周俊和 | A kind of recoverying and utilizing method of electrolytic cell overhaul slag waste cathode carbon block |
| CN102992299B (en) * | 2012-12-04 | 2016-08-10 | 周俊和 | A kind of High temperature calcination method of electrolytic aluminum cathode scrap residue |
| CN105926007A (en) * | 2016-05-27 | 2016-09-07 | 中南大学 | Water leaching-flotation method for recovering carbons and electrolytes from waste cathode carbon blocks in aluminum electrolysis cell |
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Application publication date: 20100901 |