CN105463506A - Method for separating and recycling electrolytes and carbon in anode carbon residues of aluminum electrolytes - Google Patents
Method for separating and recycling electrolytes and carbon in anode carbon residues of aluminum electrolytes Download PDFInfo
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- CN105463506A CN105463506A CN201610020158.4A CN201610020158A CN105463506A CN 105463506 A CN105463506 A CN 105463506A CN 201610020158 A CN201610020158 A CN 201610020158A CN 105463506 A CN105463506 A CN 105463506A
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- carbon
- ionogen
- aluminium electrolyte
- carbon residue
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
- C25C3/12—Anodes
- C25C3/125—Anodes based on carbon
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/18—Electrolytes
Abstract
The invention discloses a method for separating and recycling electrolytes and carbon in anode carbon residues of aluminum electrolytes. According to the method, the anode carbon residues of the aluminum electrolytes are placed in a smelting furnace and heated and melted for obtaining flux of the anode carbon residues of the aluminum electrolytes in the atmosphere of nitrogen gas or inert gas, and then gas is blown to the flux for separating the electrolytes and the carbon in the anode carbon residues of the aluminum electrolytes and obtaining the high-quality electrolytes and the high-quality carbon. The method has the advantages that the technological process is simple, the operation is easy, and the economic benefit is high. Through detection, the content of the carbon in the electrolytes obtained through the method is lower than 1%, the content of the electrolytes in the carbon is lower than 2%, and the separation efficiency is higher than 98%.
Description
Technical field
The invention belongs to metallurgical process technical field, be specifically related to a kind of method of ionogen and carbon in Separation and Recovery aluminium electrolyte anodic carbon residue.
Background technology
Can produce a large amount of containing electrolytical carbon slag in Aluminium Electrolysis process.According to statistics, the carbon slag that 1 ton of primary aluminum can produce 10 kilograms to 15 kilograms is often produced.Within 2015, China's primary aluminum output is approximately between 2,600 ten thousand tons to 2,800 ten thousand tons, and the carbon slag quantity of outer row is comparatively large, and volume of cargo in storage is surprising.Ionogen contained in carbon slag is a kind of fluorine-containing compound, if do not processed, once be diffused into soil or water body, will cause very large threat to ecotope and HUMAN HEALTH.
At present, the method for process aluminum electrolytic matter anodic carbon residue mainly contains flotation process and roasting method.The operational path of flotation process first carbon slag is carried out abrasive material classification, then adds flotation agent and carry out roughly selecting for twice, scanning for three times and triple cleaning operation, finally carry out distillating filtering to the product after flotation again.In the ionogen that flotation process obtains, carbon content is approximately 5%, and the carbon obtained is about 10% containing ionogen, and two kinds of products all can not direct industrial application.The process characteristic of roasting method directly carries out burn processing to the carbon in carbon slag at a certain temperature, and after the burning of carbon slag, its ionogen enters lime-ash, has wasted the ionogen of high added value.In sum, the method for existing process aluminum electrolytic matter anodic carbon residue exists pollutes the difficult points such as large, cost is high, waste liquid is difficult, and the ionogen rate of recovery is low, and very difficult big area carries out industrial application.
Summary of the invention
For prior art above shortcomings, technical problem to be solved by this invention is a kind of method how providing ionogen and carbon in Separation and Recovery aluminium electrolyte anodic carbon residue, can be separated with ionogen the carbon in aluminium electrolyte anodic carbon residue expeditiously, obtain high value-added product, and there is low cost, free of contamination feature.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
A method for ionogen and carbon in Separation and Recovery aluminium electrolyte anodic carbon residue, its feature is, is, after melt, carry out aluminium electrolyte anodic carbon residue heat fused air blowing treatment and ionogen is separated with carbon, then reclaim separately described melt.
Aforesaid method can be specifically comprise the steps:
1) pre-treatment: aluminium electrolyte anodic carbon residue raw material is placed in smelting furnace, under the atmosphere of nitrogen or rare gas element, heating makes the aluminium electrolyte anodic carbon residue melting sources in stove, obtains aluminium electrolyte anodic carbon residue melt; Wherein, controlling smelting furnace internal pressure is normal pressure, and temperature is 700 ~ 1600 DEG C, and heat-up time is 1 ~ 300min, and soaking time is 1 ~ 200min;
2) separating treatment: adopt the mode being blown into gas, aluminium electrolyte anodic carbon residue melt described in step 1) is processed, reaches the object of separate electrolyte and carbon, obtain ionogen and the carbon products of high-quality respectively; Wherein, blow-out position is optional position, and control airshed is 0.1 ~ 12000mL/s, and control gassing time is 1 ~ 12000min; Concrete later separation, can preferably adopt the drain pipe arranging belt switch valve and filter screen bottom smelting furnace, opens drain pipe and the mode that liquid aluminium ionogen is released is separated and reclaims separately, has the convenient separation fast feature such as thorough like this; Or directly adopt filter screen from top, the mode that the carbon granule floating to aluminium electrolyte fluid surface is pulled out to be separated again the alternate manners such as recovery to be separately separated.
The principle of aforesaid method is, after aluminium electrolyte anodic carbon residue melting sources, air blowing treatment is carried out to melt, melt composition can be made to stir, accelerate the collision enrichment in melt between carbon granules, form large carbon granules, and have a lot of active adsorption sites due to carbon grain surface, very strong adsorption phenomena is there is between energy and bubble, thus the surface of melt can be migrated to bubble, and there is not obvious adsorption phenomena between ionogen in melt and bubble, bath surface cannot be risen to bubble.After carbon granules rises to bath surface, form larger carbon block further by collision, large carbon block is difficult to again be brought in melt by gas stirring.By above principle, the ionogen in melt is finally made to be separated with carbon.
Adopt temperature to be 700 ~ 1600 DEG C in aforesaid method, heat-up time is 1 ~ 300min, and soaking time is 1 ~ 200min, and the molten state of aluminium electrolyte anodic carbon residue raw material is good under these conditions, and fusing fully, is conducive to the air blowing separating treatment in later stage; Controlling air blowing flow is 0.1 ~ 12000mL/s, selects this airshed that melt can be made fully to be stirred, is beneficial to the combination of carbon and gas better, can promote that carbon granules carries out enrichment; Control gassing time is 1 ~ 12000min, the carbon granules of enrichment can be made to have ample time and migrate to melt top, guarantees that ionogen is separated with the effective of carbon.
As optimization, in described aluminium electrolyte anodic carbon residue, electrolyte content is 10%-90%.Select such aluminium electrolyte anodic carbon residue, better Separation and Recovery effect can be reached.
As optimization, rare gas element described in step 1) is argon gas.Select argon gas can exhausted air better, better inert environments is provided, ensures that aluminium electrolyte anodic carbon residue combustion phenomena does not occur.
As optimization, step 2) in the gas that is blown into be one or more in argon gas, nitrogen, hydrogen, carbon monoxide, water vapour, carbonic acid gas, methane and ammonia.Like this, both can impel the carbon granules enrichment in melt, can not burn with the carbon granules in melt and ionogen, and with low cost.
As optimization, in step 1), temperature is 850 DEG C.Aluminium electrolyte anodic carbon residue fully can be molten into melt at such a temperature, can avoid again the problem using too high Heating temperature to waste energy simultaneously.
As optimization, in step 1), heat-up time is 30min, and soaking time is 10min.Under this heat-up time and soaking time, aluminium electrolyte anodic carbon residue can fully melt, and can not waste energy again.
As optimization, step 2) in airshed be 2mL/s.Like this, be more conducive to Melt Stirring, promotion ionogen is separated with carbon, and cost-saving to greatest extent.
As optimization step 2) in control gassing time be 5min.Select this gassing time, suitable separation efficiency can be reached, and can reduce costs.
Compared to existing technology, the present invention has following beneficial effect:
1, the present invention is blown into gas at ambient pressure, and melt composition is stirred, and accelerates the collision between the carbon granules in melt, and enrichment forms large carbon granules, and is brought to melt top by gas, finally makes the ionogen in melt be separated with carbon.In the ionogen adopting the inventive method to obtain after testing, carbon content is lower than 1%, and in carbon, electrolytical content is lower than 2%, and separation efficiency reaches more than 98%, has good separating effect.
2, the inventive method technical process is short, easy handling, and the equipment used in operating process is industrial general equipment, and cost is low, and replicability is strong.
3, the inventive method high financial profit, has good market outlook.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.The implementation case is implemented under premised on the technology of the present invention, now provide detailed embodiment and concrete operating process, illustrate that the present invention is creative, but protection scope of the present invention is not limited to following embodiment.In following specific embodiment, all adopt electrolyte content be 10% ~ 90% aluminium electrolyte anodic carbon residue implement.
In embodiment 1 one kinds of Separation and Recovery aluminium electrolyte anodic carbon residues, the method for ionogen and carbon, comprises the steps:
1) pre-treatment: aluminium electrolyte anodic carbon residue raw material is placed in smelting furnace, under the atmosphere of argon gas, heating makes the aluminium electrolyte anodic carbon residue melting sources in stove, obtains aluminium electrolyte anodic carbon residue melt; Wherein, controlling smelting furnace internal pressure is normal pressure, and temperature is 800 DEG C, and heat-up time is 50min, and soaking time is 20min;
2) separating treatment: adopt the mode being blown into hydrogen, process, reach the object of separate electrolyte and carbon to aluminium electrolyte anodic carbon residue melt described in step 1), obtains ionogen and the carbon products of high-quality; Wherein, controlling blow-out position is melt bottom, and airshed is 10mL/s, and control gassing time is 30min.
After testing, in the ionogen adopting the present embodiment method to obtain, carbon content is 0.6%, and in carbon, electrolytical content is 1.3%, and separation efficiency reaches 98.7%.
In embodiment 2 one kinds of Separation and Recovery aluminium electrolyte anodic carbon residues, the method for ionogen and carbon, comprises the steps:
1) pre-treatment: aluminium electrolyte anodic carbon residue raw material is placed in smelting furnace, under the atmosphere of nitrogen, heating makes the aluminium electrolyte anodic carbon residue melting sources in stove, obtains aluminium electrolyte anodic carbon residue melt; Wherein, controlling smelting furnace internal pressure is normal pressure, and temperature is 850 DEG C, and heat-up time is 40min, and soaking time is 10min;
2) separating treatment: adopt the mode being blown into nitrogen, process, reach the object of separate electrolyte and carbon to aluminium electrolyte anodic carbon residue melt described in step 1), obtains ionogen and the carbon products of high-quality; Wherein, controlling blow-out position is in the middle part of melt, and airshed is 5mL/s, and control gassing time is 20min.
After testing, in the ionogen adopting the present embodiment method to obtain, carbon content is 0.4%, and in carbon, electrolytical content is 1.1%, and separation efficiency reaches 98.9%.
In embodiment 3 one kinds of Separation and Recovery aluminium electrolyte anodic carbon residues, the method for ionogen and carbon, comprises the steps:
1) pre-treatment: aluminium electrolyte anodic carbon residue raw material is placed in smelting furnace, under the atmosphere of nitrogen, heating makes the aluminium electrolyte anodic carbon residue melting sources in stove, obtains aluminium electrolyte anodic carbon residue melt; Wherein, controlling smelting furnace internal pressure is normal pressure, and temperature is 900 DEG C, and heat-up time is 30min, and soaking time is 5min;
2) separating treatment: adopt the mode being blown into carbon monoxide, process, reach the object of separate electrolyte and carbon to aluminium electrolyte anodic carbon residue melt described in step 1), obtains ionogen and the carbon products of high-quality; Wherein, controlling blow-out position is melt top, and airshed is 20mL/s, and control gassing time is 5min.
After testing, in the ionogen adopting the present embodiment method to obtain, carbon content is 0.3%, and in carbon, electrolytical content is 0.9%, and separation efficiency reaches 99.1%.
In embodiment 4 one kinds of Separation and Recovery aluminium electrolyte anodic carbon residues, the method for ionogen and carbon, comprises the steps:
1) pre-treatment: aluminium electrolyte anodic carbon residue raw material is placed in smelting furnace, under the atmosphere of argon gas, heating makes the aluminium electrolyte anodic carbon residue melting sources in stove, obtains aluminium electrolyte anodic carbon residue melt; Wherein, controlling smelting furnace internal pressure is normal pressure, and temperature is 850 DEG C, and heat-up time is 30min, and soaking time is 10min;
2) separating treatment: adopt the mode being blown into argon gas, process, reach the object of separate electrolyte and carbon to aluminium electrolyte anodic carbon residue melt described in step 1), obtains ionogen and the carbon products of high-quality; Wherein, controlling blow-out position is melt bottom, and airshed is 2mL/s, and control gassing time is 5min.
After testing, in the ionogen adopting the present embodiment method to obtain, carbon content is 0.2%, and in carbon, electrolytical content is 0.7%, and separation efficiency reaches 99.3%.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (9)
1. the method for ionogen and carbon in Separation and Recovery aluminium electrolyte anodic carbon residue, it is characterized in that, be, after melt, carry out aluminium electrolyte anodic carbon residue heat fused air blowing treatment and ionogen is separated with carbon, then reclaim separately described melt.
2. the method for ionogen and carbon in Separation and Recovery aluminium electrolyte anodic carbon residue according to claim 1, is characterized in that, specifically comprise the steps:
1) pre-treatment: aluminium electrolyte anodic carbon residue raw material is placed in smelting furnace, under the atmosphere of nitrogen or rare gas element, heating makes the aluminium electrolyte anodic carbon residue melting sources in stove, obtains aluminium electrolyte anodic carbon residue melt; Wherein, controlling smelting furnace internal pressure is normal pressure, and temperature is 700 ~ 1600 DEG C, and heat-up time is 1 ~ 300min, and soaking time is 1 ~ 200min;
2) separating treatment: carry out air blowing treatment to aluminium electrolyte anodic carbon residue melt described in step 1), reach the object of separate electrolyte and carbon, obtains ionogen and carbon products respectively; Wherein, control airshed is 0.1 ~ 12000mL/s, and control gassing time is 1 ~ 12000min.
3. the method for ionogen and carbon in Separation and Recovery aluminium electrolyte anodic carbon residue according to claim 1, it is characterized in that, in described aluminium electrolyte anodic carbon residue, electrolyte content is 10% ~ 90%.
4. the method for ionogen and carbon in Separation and Recovery aluminium electrolyte anodic carbon residue according to claim 1, it is characterized in that, rare gas element described in step 1) is argon gas.
5. the method for ionogen and carbon in Separation and Recovery aluminium electrolyte anodic carbon residue according to claim 1, it is characterized in that, step 2) in the gas that is blown into be one or more in argon gas, nitrogen, hydrogen, carbon monoxide, water vapour, carbonic acid gas, methane and ammonia.
6. the method for ionogen and carbon in Separation and Recovery aluminium electrolyte anodic carbon residue according to claim 1, it is characterized in that, in step 1), temperature is 850 DEG C.
7. the method for ionogen and carbon in Separation and Recovery aluminium electrolyte anodic carbon residue according to claim 1, it is characterized in that, in step 1), heat-up time is 30min, and soaking time is 10min.
8. the method for ionogen and carbon in Separation and Recovery aluminium electrolyte anodic carbon residue according to claim 1, is characterized in that, step 2) in airshed be 2mL/s.
9. the method for ionogen and carbon in Separation and Recovery aluminium electrolyte anodic carbon residue according to claim 1, is characterized in that, step 2) in control gassing time be 5min.
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Cited By (8)
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| CN106247340A (en) * | 2016-10-08 | 2016-12-21 | 淄博海慧工程设计咨询有限公司 | A kind of processing method and processing device of electrolytic aluminium carbon slag |
| CN106917110A (en) * | 2017-03-07 | 2017-07-04 | 山西大学 | A kind of method for separating and recovering carbon slag and electrolyte in electrolytic aluminium waste anode slag |
| CN107130260A (en) * | 2017-05-23 | 2017-09-05 | 中南大学 | A kind of fusion method process aluminum electrolytic breeze additive and its application method |
| CN107604383A (en) * | 2017-09-08 | 2018-01-19 | 高毅 | A kind of method of electrolyte in smelting process extraction carbon slag |
| CN109136993A (en) * | 2018-09-25 | 2019-01-04 | 兰州中铝工业服务有限公司 | A kind of post-processing approach for the regeneration ice crystal that wet-treating electrolytic aluminium carbon slag obtains |
| CN110067009A (en) * | 2019-06-12 | 2019-07-30 | 薛淼 | A kind of electrolyte block and its extraction process based on the extraction of carbon slag |
| CN114232031A (en) * | 2021-12-29 | 2022-03-25 | 云南云铝海鑫铝业有限公司 | Method for extracting electrolyte by rapidly combusting and decarbonizing carbon slag waste |
| CN114618865A (en) * | 2022-02-28 | 2022-06-14 | 北京科技大学 | Recycling method of anode carbon slag |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106247340A (en) * | 2016-10-08 | 2016-12-21 | 淄博海慧工程设计咨询有限公司 | A kind of processing method and processing device of electrolytic aluminium carbon slag |
| CN106917110A (en) * | 2017-03-07 | 2017-07-04 | 山西大学 | A kind of method for separating and recovering carbon slag and electrolyte in electrolytic aluminium waste anode slag |
| CN106917110B (en) * | 2017-03-07 | 2018-10-16 | 山西大学 | A method of carbon slag and electrolyte in separation and recovery electrolytic aluminium waste anode slag |
| CN107130260A (en) * | 2017-05-23 | 2017-09-05 | 中南大学 | A kind of fusion method process aluminum electrolytic breeze additive and its application method |
| CN107130260B (en) * | 2017-05-23 | 2019-06-11 | 中南大学 | A kind of fusion method process aluminum electrolytic breeze additive and its application method |
| CN107604383A (en) * | 2017-09-08 | 2018-01-19 | 高毅 | A kind of method of electrolyte in smelting process extraction carbon slag |
| CN109136993A (en) * | 2018-09-25 | 2019-01-04 | 兰州中铝工业服务有限公司 | A kind of post-processing approach for the regeneration ice crystal that wet-treating electrolytic aluminium carbon slag obtains |
| CN110067009A (en) * | 2019-06-12 | 2019-07-30 | 薛淼 | A kind of electrolyte block and its extraction process based on the extraction of carbon slag |
| CN114232031A (en) * | 2021-12-29 | 2022-03-25 | 云南云铝海鑫铝业有限公司 | Method for extracting electrolyte by rapidly combusting and decarbonizing carbon slag waste |
| CN114618865A (en) * | 2022-02-28 | 2022-06-14 | 北京科技大学 | Recycling method of anode carbon slag |
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