CN106629606A - Method for separating fluoride salt and carbon in aluminum electrolysis carbon residues - Google Patents
Method for separating fluoride salt and carbon in aluminum electrolysis carbon residues Download PDFInfo
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- CN106629606A CN106629606A CN201610972916.2A CN201610972916A CN106629606A CN 106629606 A CN106629606 A CN 106629606A CN 201610972916 A CN201610972916 A CN 201610972916A CN 106629606 A CN106629606 A CN 106629606A
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- carbon
- fluoride salt
- slag
- carbon slag
- vacuum distillation
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B9/00—General methods of preparing halides
- C01B9/08—Fluorides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Inorganic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
The invention discloses a method for separating fluoride salt and carbon in aluminum electrolysis carbon residues, relates to a method for treating anode carbon residues generated in an aluminum electrolysis process, and in particular relates to a method for recycling fluoride salt and carbon in the anode carbon residues. The method is characterized by comprising the following steps: separating fluoride salt and carbon in carbon residues in the separation process by adopting a vacuum distillation furnace, condensing and collecting the fluoride salt on the upper part of the vacuum distillation furnace, and collecting the reaction carbon residues on the lower part of the vacuum distillation furnace. According to the method disclosed by the invention, the fluoride salt separation effect is good, the separated fluoride salt is low in impurity content and can directly return to an electrolytic cell, the content of carbon in the rest carbon residues is greatly improved, the carbon can be returned to a carbon plant for utilization, and the fluoride salt and carbon in the aluminum electrolysis carbon residues can be efficiently recycled.
Description
Technical field
A kind of method of fluoride salt and carbon in separation carbon slag in Aluminium electrolysis, is related to the anode carbon produced in a kind of aluminium electrolysis process
The processing method of slag, the method for particularly reclaiming fluoride salt and carbon in anodic carbon residue.
Background technology
With the continuous expansion of aluminium electroloysis production capacity, the demand of carbon anode is constantly increased, under the quality of carbon materials is continuous
Drop so that carbon anode quality is gradually reduced.In aluminium electrolysis process, due to there is selective oxidation, unburned particles of aggregates
Carbon slag is formed in electrolyte solution, generally, carbon slag can burn in bath surface, but in excessive situation
Under, artificial salvaging in time is needed, to reduce adverse effect of the carbon slag to electrolysis.Excessive carbon slag can increase bath resistance, draw
Low pole span, reduces current efficiency, increases power consumption；The excessive carbon slag of bath surface can cause electrolyte pressure drop to raise, and receive electric energy
Enter to increase, bath temperature is raised, produce heat channel；When aluminium electrolyte solution surface floats a large amount of carbon slags, carbon slag and carbon anode and negative electrode
Composition current path, causes current loss；Carbon slag can excessively reduce the dissolution velocity of aluminum oxide in electrolyte, cause bearth precipitation
Increase, groove condition deteriorates；The carbon slag pulled out can take away a large amount of electrolyte, have partially fluorinated salt and thoroughly do not lose due to reclaiming
Fall.
The fluoride salt of 60%-70% is had in the carbon slag pulled out, it is industrial at present mainly to be reclaimed using floatation or combustion method
Fluoride salt in carbon slag, but reclaim and be difficult to thoroughly, understand some fluoride salt stream in loss.Floatation flow process factory, waste liquid compares
It is difficult, and combustion method not only slatterns most carbon, can also cause the volatilization loss of fluoride salt, most serious are to environment
Pollution is larger.
Therefore, develop can high efficiente callback using the fluoride salt and carbon in carbon slag in Aluminium electrolysis, and simple economy does not pollute
Environment, should be the following direction for processing carbon slag.
The content of the invention
The purpose of the present invention is aiming at the deficiency that above-mentioned prior art is present, there is provided one kind can high efficiente callback utilize aluminium
Fluoride salt and carbon in electrolytic carbon slag, and simple economy, the side of fluoride salt and carbon in separation carbon slag in Aluminium electrolysis free from environmental pollution
Method.
To achieve these goals, the present invention is employed the following technical solutions.
A kind of method of fluoride salt and carbon in separation carbon slag in Aluminium electrolysis, it is characterised in that its separation process adopts vacuum distillation
Stove carries out the separation of fluoride salt and carbon in carbon slag, and on vacuum distillation furnace top, fluoride salt is collected in condensation, and vacuum distillation furnace bottom is received
Collection reaction residual carbon slag.
The method of fluoride salt and carbon in a kind of separation carbon slag in Aluminium electrolysis of the present invention, it is characterised in that described separation process
The vacuum degree control of vacuum distillation furnace is 1 ~ 100Pa.
The method of fluoride salt and carbon in a kind of separation carbon slag in Aluminium electrolysis of the present invention, it is characterised in that described separation process
Carbon slag in Aluminium electrolysis granularity is 0.1 ~ 2mm.
The method of fluoride salt and carbon in a kind of separation carbon slag in Aluminium electrolysis of the present invention, it is characterised in that described separation process
The material bed thickness of vacuum distillation furnace is 5 ~ 100mm.
The method of fluoride salt and carbon in a kind of separation carbon slag in Aluminium electrolysis of the present invention, it is characterised in that described separation process
Reaction temperature be 800 ~ 1200 DEG C.
The method of fluoride salt and carbon in a kind of separation carbon slag in Aluminium electrolysis of the present invention, it is characterised in that described separation process
Reaction time be 1 ~ 10h.
The method of fluoride salt and carbon in a kind of separation carbon slag in Aluminium electrolysis of the present invention, compared with prior art, is fluorinated salinity
Good from effect, the fluoride salt impurity content after separation is low, can directly return electrolytic cell, and carbon content is significantly carried in residual carbon slag
Height, can return to carbon element factory and be used, and the high efficiente callback for realizing fluoride salt and carbon in carbon slag in Aluminium electrolysis is utilized.
Specific embodiment
A kind of method of fluoride salt and carbon in separation carbon slag in Aluminium electrolysis, its separation process carries out carbon slag using vacuum distillation furnace
The separation of middle fluoride salt and carbon, on vacuum distillation furnace top, fluoride salt is collected in condensation, and the reaction of vacuum distillation furnace collective low is remaining
Carbon slag.Fluoride salt impurity content after separation is low, can directly return electrolytic cell, and carbon content is greatly improved in residual carbon slag, can
It is used with returning to carbon element factory, the high efficiente callback for realizing fluoride salt and carbon in carbon slag in Aluminium electrolysis is utilized.
The method of fluoride salt and carbon in a kind of described separation carbon slag in Aluminium electrolysis, vacuum can control 1 ~ 100Pa it
Between.
The method of fluoride salt and carbon in a kind of described separation carbon slag in Aluminium electrolysis, carbon slag particle degree can be in 0.1 ~ 2mm scopes
Interior change.
The method of fluoride salt and carbon in a kind of described separation carbon slag in Aluminium electrolysis, material bed thickness can 5 ~ 100mm it
Between adjust.
The method of fluoride salt and carbon in a kind of described separation carbon slag in Aluminium electrolysis, reaction temperature may be set in 800 ~ 1200
Between DEG C.
The method of fluoride salt and carbon in a kind of described separation carbon slag in Aluminium electrolysis, the reaction time can be between 1 ~ 10h
Arbitrary value.
Embodiment 1
A kind of method of fluoride salt and carbon in separation carbon slag in Aluminium electrolysis, with fluoride salt and carbon in vacuum distillation furnace separation of carbon slag,
In the case where vacuum is 5Pa, the granularity for controlling carbon slag is 0.5-1mm, material bed thickness 5cm, 950 DEG C of reaction temperature and reaction time
4h, fluoride salt on top, collect by condensation, and the volatility of fluoride salt is 83.6%, and the fluorination purity salt of condensation is 99.7%, and bottom is
Reaction residual carbon slag, the carbon content in carbon slag is 78.3%, so as to reach the purpose for separating fluoride salt and carbon.
Embodiment 2
A kind of method of fluoride salt and carbon in separation carbon slag in Aluminium electrolysis, with fluoride salt and carbon in vacuum distillation furnace separation of carbon slag,
In the case where vacuum is 1Pa, when the granularity for controlling carbon slag is 0.1-0.5mm, material bed thickness 2cm, 980 DEG C of reaction temperature and reaction
Between 5h, fluoride salt on top, collect by condensation, and the volatility of fluoride salt is 87.8%, and the fluorination purity salt of condensation is 99.6%, bottom
To react residual carbon slag, the carbon content in carbon slag is 80.3%, so as to reach the purpose for separating fluoride salt and carbon.
Embodiment 3
A kind of method of fluoride salt and carbon in separation carbon slag in Aluminium electrolysis, with fluoride salt and carbon in vacuum distillation furnace separation of carbon slag,
In the case where vacuum is 80Pa, the granularity for controlling carbon slag is 0.3-1.5mm, material bed thickness 5cm, 1000 DEG C of reaction temperature and reaction
Time 2h, fluoride salt on top, collect by condensation, and the volatility of fluoride salt is 80.6%, and the fluorination purity salt of condensation is 99.1%, under
Portion is reaction residual carbon slag, and the carbon content in carbon slag is 71.2%, so as to reach the purpose for separating fluoride salt and carbon.
Embodiment 4
A kind of method of fluoride salt and carbon in separation carbon slag in Aluminium electrolysis, with fluoride salt and carbon in vacuum distillation furnace separation of carbon slag,
In the case where vacuum is 20Pa, when the granularity for controlling carbon slag is 1-1.5mm, material bed thickness 6cm, 850 DEG C of reaction temperature and reaction
Between 8h, fluoride salt on top, collect by condensation, and the volatility of fluoride salt is 82.7%, and the fluorination purity salt of condensation is 99.5%, bottom
To react residual carbon slag, the carbon content in carbon slag is 72.3%, so as to reach the purpose for separating fluoride salt and carbon.
It is described above not to limit the present invention, all changes within the essential scope of the present invention, made, remodeling,
Addition or replacement etc., should all belong to protection scope of the present invention.
Claims (6)
1. it is a kind of separate carbon slag in Aluminium electrolysis in fluoride salt and carbon method, it is characterised in that its separation process adopts vacuum distillation furnace
The separation of fluoride salt and carbon in carbon slag is carried out, fluoride salt, vacuum distillation furnace collective low are collected in the condensation on vacuum distillation furnace top
Reaction residual carbon slag.
2. it is according to claim 1 it is a kind of separate carbon slag in Aluminium electrolysis in fluoride salt and carbon method, it is characterised in that it is described
Separation process vacuum distillation furnace vacuum degree control be 1 ~ 100Pa.
3. it is according to claim 1 it is a kind of separate carbon slag in Aluminium electrolysis in fluoride salt and carbon method, it is characterised in that it is described
Separation process carbon slag in Aluminium electrolysis granularity be 0.1 ~ 2mm.
4. it is according to claim 1 it is a kind of separate carbon slag in Aluminium electrolysis in fluoride salt and carbon method, it is characterised in that it is described
Separation process vacuum distillation furnace material bed thickness be 5 ~ 100mm.
5. it is according to claim 1 it is a kind of separate carbon slag in Aluminium electrolysis in fluoride salt and carbon method, it is characterised in that it is described
Separation process reaction temperature be 800 ~ 1200 DEG C.
6. it is according to claim 1 it is a kind of separate carbon slag in Aluminium electrolysis in fluoride salt and carbon method, it is characterised in that it is described
Separation process reaction time be 1 ~ 10h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610972916.2A CN106629606A (en) | 2016-11-07 | 2016-11-07 | Method for separating fluoride salt and carbon in aluminum electrolysis carbon residues |
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| CN201610972916.2A CN106629606A (en) | 2016-11-07 | 2016-11-07 | Method for separating fluoride salt and carbon in aluminum electrolysis carbon residues |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115819086A (en) * | 2022-12-30 | 2023-03-21 | 东北大学 | Method for preparing carbon anode by using aluminum electrolysis carbon slag |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002012594A2 (en) * | 2000-08-04 | 2002-02-14 | Servibras-Servicos Especiais Indústria E Comércio Ltda. | Treatment process for waste from aluminium production cells |
| CN104894600A (en) * | 2015-05-25 | 2015-09-09 | 东北大学 | Method for separating and recovering carbon and electrolytic constituents from aluminum molten salt electrolysis carbon-containing solid wastes |
| CN105642649A (en) * | 2015-12-30 | 2016-06-08 | 北京矿冶研究总院 | High-temperature treatment method for waste cathode of electrolytic aluminum |
-
2016
- 2016-11-07 CN CN201610972916.2A patent/CN106629606A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002012594A2 (en) * | 2000-08-04 | 2002-02-14 | Servibras-Servicos Especiais Indústria E Comércio Ltda. | Treatment process for waste from aluminium production cells |
| CN104894600A (en) * | 2015-05-25 | 2015-09-09 | 东北大学 | Method for separating and recovering carbon and electrolytic constituents from aluminum molten salt electrolysis carbon-containing solid wastes |
| CN105642649A (en) * | 2015-12-30 | 2016-06-08 | 北京矿冶研究总院 | High-temperature treatment method for waste cathode of electrolytic aluminum |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115819086A (en) * | 2022-12-30 | 2023-03-21 | 东北大学 | Method for preparing carbon anode by using aluminum electrolysis carbon slag |
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Application publication date: 20170510 |