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Electrolyte for aluminium electrolysis and electrolysis technology using same

An electrolyte and electrolytic aluminum technology, which is applied in the field of non-ferrous metal smelting industry, can solve problems such as corrosion, lower electrolyte primary crystal temperature, and shortage, and achieve the effects of reducing volatilization loss, reducing energy consumption, and low primary crystal temperature

Active Publication Date: 2014-01-01
北京润括未来科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the prior art, while further reducing the primary crystal temperature of the electrolyte, it can also avoid the corrosion of the electrolysis device and the harm to the human body, and at the same time ensure that the prepared electrolyte has a suitable conductivity. In order to solve the problem of electrolyte with alumina solubility and no "crust" phenomenon, the present invention provides an electrolyte with low initial crystal temperature, no corrosion effect on the electrolytic cell, non-volatile, suitable electrical conductivity and alumina solubility, and no "crust" phenomenon. Electrolyte for aluminum electrolysis and electrolysis process using the electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The composition of the electrolyte in the present embodiment is: NaF, 32%; AlF 3 , 57%; LiF, 3; KF, 4%; Al 2 o 3 , 4%, where NaF and aluminum fluoride AlF 3 The molar ratio is 1.12.

[0035] The performance of the electrolyte described in this example was measured, and the result is that the primary crystal temperature of the electrolyte in this example is 640°C.

[0036] The electrolytic process using the electrolyte described in this example is:

[0037] (1) The above amount of NaF, AlF 3 , LiF, KF, Al 2 o 3 mixing and heating the resulting mixture to form a melt;

[0038] (2) Heat the melt prepared in step (1) to 720°C for electrolysis, and quantitatively supplement Al during the electrolysis process 2 o 3 , the conductivity of the electrolyte during electrolysis ≈1.7Ω -1 cm -1 , density ≈2.03g / cm 3 , the saturation concentration of alumina is 5%.

Embodiment 2

[0040] The composition of the electrolyte in the present embodiment is: NaF, 38%; AlF 3 , 50%; LiF, 2%; KF, 5%; Al 2 o 3 , 5%, where NaF and aluminum fluoride AlF 3 The molar ratio is 1.52.

[0041] The performance of the electrolyte described in this embodiment was measured, and the result is that the primary crystal temperature of the electrolyte in this embodiment is 670°C.

[0042] The electrolytic process using the electrolyte described in this example is:

[0043] (1) The above amount of NaF, AlF 3 , LiF, and KF are mixed, and the obtained mixture is heated until it melts, and then the above-mentioned amount of Al is added 2 o 3 get the melt

[0044] (2) Heat the melt prepared in step (1) to 760°C for electrolysis. During the electrolysis, the conductivity of the electrolyte is ≈1.8Ω -1 cm -1 , Density ≈2.05g / cm 3 , the saturation concentration of alumina is 6%.

Embodiment 3

[0046] The composition of the electrolyte in the present embodiment is: NaF, 32%; AlF 3 , 57%; LiF, 3%; KF, 4%; Al 2 o 3 , 4%, where NaF and aluminum fluoride AlF 3 The molar ratio is 1.12.

[0047] The performance of the electrolyte described in this example was measured, and the result is that the primary crystal temperature of the electrolyte in this example is 640°C.

[0048] The electrolytic process using the electrolyte described in this example is:

[0049] (1) The above amount of NaF, AlF 3 , LiF, KF, Al 2 o 3 mixing and heating the resulting mixture to form a melt;

[0050] (2) Heat the melt prepared in step (1) to 730°C for electrolysis, and quantitatively supplement Al during the electrolysis process 2 o 3 , the conductivity of the electrolyte during electrolysis ≈1.6Ω -1 cm -1 , density ≈2.03g / cm 3 , the saturation concentration of alumina is 5%.

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Abstract

The invention relates to an electrolyte for aluminium electrolysis and an electrolysis technology using the same. The electrolyte adopts a pure fluoride salt system, which comprises following components in percentage by weight: 30 to 38% of NaF, 49 to 60% of AlF3, 1 to 5% of LiF, 1 to 6% of KF, and 3 to 6% of Al2O3; wherein the mole ratio of NaF to AlF3 is 1.0 to 1.52. The electrolyte has the advantages of low liquidus temperature, good solubility of prepared alumina, and high conductivity, and has the good functions of reducing energy consumption, increasing current efficiency, and improving work environment during the electrolysis process.

Description

technical field [0001] The invention relates to an electrolyte for electrolytic aluminum and an electrolysis process using the electrolyte, belonging to the nonferrous metal smelting industry. Background technique [0002] Electrolytic aluminum is to obtain aluminum by electrolysis. In the prior art, the electrolytic aluminum usually adopts the traditional Hall-Heroult molten salt electrolytic aluminum process, which adopts the cryolite-alumina molten salt electrolysis method, which uses cryolite Na 3 AlF 6 The fluoride salt melt is used as a flux, and the Al 2 o 3 Dissolved in fluoride salt, with carbon body as anode and aluminum liquid as cathode, after passing through a strong direct current, under the high temperature condition of 940-960°C, electrochemical reaction is carried out at the two poles of the electrolytic cell to obtain electrolytic aluminum . Due to the high electrolysis temperature, the traditional electrolytic aluminum process has the characteristics ...

Claims

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Application Information

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IPC IPC(8): C25C3/18
Inventor 孙松涛方玉林
Owner 北京润括未来科技有限公司
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