CN110093631A - Highly dissoluble acid oxidation aluminium electrolyte system used for aluminium electrolysis and its application - Google Patents
Highly dissoluble acid oxidation aluminium electrolyte system used for aluminium electrolysis and its application Download PDFInfo
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- CN110093631A CN110093631A CN201910468246.4A CN201910468246A CN110093631A CN 110093631 A CN110093631 A CN 110093631A CN 201910468246 A CN201910468246 A CN 201910468246A CN 110093631 A CN110093631 A CN 110093631A
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- electrolyte system
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- oxidation 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
- C25C3/18—Electrolytes
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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
- C25C3/20—Automatic control or regulation of cells
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Abstract
The present invention provides a kind of electrolyte system and its application that highly dissoluble acid oxidation aluminium is used for aluminium electrolysis, each component including following mass percent: NaF 30%-35%, KCl 1%-8%, CaF2For 0-5%, LiF 0-3%, MgF2For 0-2%, Al203For 1%-3%, AlF3For 38%-40%, surplus is ice crystal.Electrolyte system provided by the invention can be suitably used for acid oxidation aluminium electroloysis aluminium, the disadvantage which overcomes acid oxidation aluminium solution rate in electrolyte system slow.
Description
Technical field
The present invention relates to acid oxidation aluminium technical field of aluminum electrolysis, in particular to a kind of highly dissoluble acid oxidation aluminium aluminium electricity
The electrolyte system of solution and its application.
Background technique
Traditional soda aluminium oxide aluminium electrolytic industry uses always traditional Hal l-Herouh method at present, and electrolyte is
Na3AlF6-A12O3, it is commonly incorporated into CaF2Or CaF is generated since raw material brings calcium oxide into2.In order to control molecular proportion in electrolytic process
(NaF and AlF3The ratio between amount of substance), usually addition AlF3, by the molecular proportion control of electrolyte within the scope of certain, purpose
It is the property for improving electrolyte, mainly reduction liquidus temperature etc. realizes lower temperature electrolysis to reach energy-efficient purpose.Usually
The physicochemical properties of cryolite-alumina fused salt can only be improved by adding some salts, to improve aluminum electrolysis
Overall target.Added salt should be stablized, and not decompose in aluminium electroloysis, while it is molten to play improvement cryolite-alumina
The physical and chemical performance of liquid, such as reduce fusing point, improve conductivity or improve the solubility of aluminium etc..It substantially can satisfy above-mentioned institute
Purposive additive is seldom, only finds in alkali metal fluoride, chloride or alkali earth metal fluoride, chloride.
Acid oxidation aluminium is due to its special physical and chemical performance, traditional electrolyte system suitable for alkaline process aluminium oxide
Acid oxidation aluminium is not suitable for, it is demonstrated experimentally that dissolubility of solubility property of the acid oxidation aluminium in traditional electrolyte matter compared with alkaline process
It can be poor.
Summary of the invention
In view of this, the present invention provides a kind of electrolyte system that can be suitably used for acid oxidation aluminium aluminium electroloysis, the electrolyte
The disadvantage that system can overcome acid oxidation aluminium solution rate in electrolyte system slow.
The present invention be reach its purpose, the technical solution adopted is as follows:
A kind of electrolyte system that highly dissoluble acid oxidation aluminium is used for aluminium electrolysis, each group including following mass percent
Point:
NaF is 30%-35%,
KCl is 1%-8%,
CaF2For 0-5%,
LiF is 0-3%,
MgF2For 0-2%,
Al203For 1.0%-3%, the preferably 1.5-3% (Al203From acid oxidation aluminium)
AlF3For 38%-40%,
Surplus is ice crystal.
Preferably, total molecular proportion CR of the electrolyte system (refers to NaF and AlF in electrolyte system3Molar ratio) be
2.3-2.5。
In preferred embodiment, in electrolyte system, the CaF2、LiF、MgF2The sum of three > 0.For example, some excellent
It selects in embodiment, the CaF2Mass percent be 2-5%.In some preferred embodiments, the quality hundred of the LiF
Divide than being 1-2.5%.In some preferred embodiments, the MgF2Mass percent be 1-2%.Using preferred ratio
Example, is more advantageous to the electrolysis of acid oxidation aluminium.
Electrolyte system provided by the invention has acid system oxygen particularly suitable for the application in acid oxidation aluminium aluminium electroloysis
Change the high feature of aluminium solubility and controls the temperature of electrolyte when carrying out acid oxidation aluminium electroloysis using electrolyte of the invention
It is 930-953 DEG C, anodic current density 0.85-1A/cm3, electrolysis effectiveness is more preferably under this condition.Electrolyte of the invention
Liquidus temperature is 920-943 DEG C, and between 1.5%-3%, solution rate is greatly speeded up aluminium oxide saturation solubility.
Technical solution provided by the invention has the following beneficial effects:
Electrolyte provided by the invention can be suitably used for acid oxidation aluminium aluminium electroloysis, with the high spy of acid oxidation aluminium solubility
Point, and the solution rate of acid oxidation aluminium can be accelerated.
Specific embodiment
For a better understanding of the technical solution of the present invention, below with reference to the embodiment content that the present invention is further explained,
But the contents of the present invention are not limited only to following embodiment.
Embodiment 1
Acid oxidation aluminium electrolyte system, material composition are as follows: NaF 30wt%, KCl 1wt%, AlF3For 38wt%,
CaF2For 4wt%, LiF 0wt%, MgF2For lwt%, A1203For 1.5wt%, surplus is ice crystal；Electrolyte system it is total
Molecular proportion CR is 2.3；Electrolytic condition of the acid oxidation aluminium in electrolyte system are as follows: 930 DEG C of electrolysis temperature, anodic current density
For 0.96A/cm2。
Embodiment 2
Acid oxidation aluminium electrolyte system, material composition are as follows: NaF 31wt%, KCl 3wt%, AlF3For 39wt%,
CaF2For 2wt%, LiF 1wt%, MgF2For l.5wt%, A1203For 2wt%, surplus is ice crystal；Electrolyte system it is total
Molecular proportion CR is 2.4；The electrolytic condition that acid oxidation aluminium is electrolysed in electrolyte system are as follows: 930 DEG C of electrolysis temperature, anode current
Density is 0.89A/cm2。
Embodiment 3
Acid oxidation aluminium electrolyte system, material composition are as follows: NaF 32wt%, KCl 3wt%, AlF3For 38wt%,
CaF2For 0wt%, LiF 2.5wt%, MgF2For 2wt%, A1203For 2.5wt%, surplus is ice crystal；Electrolyte system
Total molecular proportion CR is 2.4；Electrolytic condition of the acid oxidation aluminium in electrolyte system are as follows: 943 DEG C of electrolysis temperature, anode current is close
Degree is 0.9A/cm2。
Embodiment 4
Acid oxidation aluminium electrolyte system, material composition are as follows: NaF 34wt%, KCl 6wt%, AlF3For 40wt%,
CaF2For 3wt%, LiF 1wt%, MgF2For 0wt%, A1203For 1.5wt%, surplus is ice crystal；Electrolyte system it is total
Molecular proportion CR is 2.3；Electrolytic condition of the acid oxidation aluminium in electrolyte system are as follows: 953 DEG C of electrolysis temperature, anodic current density
For 0.85A/cm2。
Embodiment 5
Acid oxidation aluminium electrolyte system, material composition are as follows: NaF 35wt%, KCl 7wt%, AlF3For 40wt%,
CaF2For 4wt%, LiF 2wt%, MgF2For lwt%, A1203For 3wt%, surplus is ice crystal；The total score of electrolyte system
Son ratio CR is 2.4；Acid oxidation aluminium electrolytic condition in electrolyte system are as follows: 952 DEG C of electrolysis temperature, anodic current density is
0.85A/cm2。
Embodiment 6
Acid oxidation aluminium electrolyte system, material composition are as follows: NaF 35wt%, KCl 8wt%, AlF3For 39wt%,
CaF2For 5wt%, LiF 3wt%, MgF2For 2wt%, A1203For 2.7wt%, surplus is ice crystal；Electrolyte system it is total
Molecular proportion CR is 2.5；Electrolytic condition of the acid oxidation aluminium in electrolyte system are as follows: 952 DEG C of electrolysis temperature, anodic current density
For 0.85A/cm2。
The alumina raw material of embodiment 1-6 is acid oxidation aluminium, and the alumina raw material of comparative example 1 is alkaline process aluminium oxide, right
The alumina raw material of ratio 2 is acid oxidation aluminium.
Table 1
From the above experiment as it can be seen that comparing with comparative example 2, in 1-6 of the embodiment of the present invention, acid oxidation aluminium solubility is high, and
Solution rate is fast.And from comparative example 1 as it can be seen that be suitable for the electrolyte system of acid oxidation aluminium, when being used for alkaline process aluminium oxide, and
Comparable electrolysis effectiveness cannot be obtained.
The concrete technology operation of the various embodiments described above and comparative example involved in electrolytic process is all made of this field aluminium oxide
The common process of electrolysis, which operates, to carry out, and does not repeat one by one this.
It will be understood by those skilled in the art that under the introduction of this specification, the present invention can be made some modifications or
Adjustment.These modifications or adjustment should also be as within the scope of the claims in the present invention.
Claims (10)
1. a kind of electrolyte system that highly dissoluble acid oxidation aluminium is used for aluminium electrolysis, which is characterized in that including following quality percentage
The each component of ratio:
NaF is 30%-35%,
KCl is 1%-8%,
CaF2For 0-5%,
LiF is 0-3%,
MgF2For 0-2%,
Al203For 1.0%-3.0%,
AlF3For 38%-40%,
Surplus is ice crystal.
2. electrolyte system according to claim 1, which is characterized in that total molecular proportion CR of the electrolyte system is
2.3-2.5。
3. electrolyte system according to claim 1 or 2, which is characterized in that the CaF2、LiF、MgF2The sum of three >
0。
4. electrolyte system according to claim 1-3, which is characterized in that the CaF2Mass percent be
2-5%.
5. electrolyte system according to claim 1-4, which is characterized in that the mass percent of the LiF is
1-2.5%.
6. electrolyte system according to claim 1-5, which is characterized in that the MgF2Mass percent be
1-2%.
7. electrolyte system according to claim 1-6, which is characterized in that the Al203For 1.5-3%.
8. electrolyte system according to claim 1-7, which is characterized in that the primary crystal temperature of the electrolyte system
Degree is 920-943 DEG C.
9. electrolyte system according to claim 1-8, which is characterized in that the aluminium oxide of the electrolyte system
Saturation solubility is 1.5wt%-3wt%.
10. application of the described in any item electrolyte systems of claim 1-9 in acid oxidation aluminium aluminium electroloysis, feature exist
In in acid oxidation aluminium electroloysis, the temperature for controlling electrolyte system is 930-953 DEG C, anodic current density 0.85-1A/
cm3。
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| CN201910468246.4A CN110093631B (en) | 2019-05-31 | 2019-05-31 | Electrolyte system for electrolyzing high-solubility acid-process alumina and application thereof |
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| CN201910468246.4A CN110093631B (en) | 2019-05-31 | 2019-05-31 | Electrolyte system for electrolyzing high-solubility acid-process alumina and application thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820818A (en) * | 2013-12-30 | 2014-05-28 | 中国神华能源股份有限公司 | Aluminum electrolysis plastidome for aluminum oxide electrolysis of one-step acid solution method production and application of aluminum electrolysis plastidome |
| CN103849897A (en) * | 2014-02-28 | 2014-06-11 | 云南云铝涌鑫铝业有限公司 | Method of preparing metal aluminum |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820818A (en) * | 2013-12-30 | 2014-05-28 | 中国神华能源股份有限公司 | Aluminum electrolysis plastidome for aluminum oxide electrolysis of one-step acid solution method production and application of aluminum electrolysis plastidome |
| CN103849897A (en) * | 2014-02-28 | 2014-06-11 | 云南云铝涌鑫铝业有限公司 | Method of preparing metal aluminum |
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