Electrolytic bath for aluminium electrolysis and electrolysis technology using same

An electrolytic cell and electrolytic aluminum technology, applied in the field of electrolytic process and electrolytic aluminum electrolytic cell, can solve the problems of low oxidation resistance of oxide film, large power consumption of electrolytic aluminum process, and high overvoltage of alloy anode, and achieve overvoltage Low, high oxidation resistance, low power consumption effect

Inactive Publication Date: 2014-01-01
INNER MONGOLIA UNITED IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The second technical problem to be solved by the present invention is that the alloy anode composed of metal components in the prior art has high overvoltage, the power consumption of the electrolytic aluminum process is large, and the metal components used are expensive, resulting in the failure of the alloy anode. Increased cost; in addition, in the prior art, the oxidation resistance of the oxide film on the surface of the alloy anode is low and easy to fall off, resulting in the alloy anode being continuously consumed and poor in corrosion resistance, and the corrosion or peeling of the oxide film into the liquid aluminum reduces the The purity of the final product aluminum; and then propose an electrolytic cell for electrolytic aluminum with low overvoltage and low price of the inert anode material used, and the oxide film formed on the surface has strong oxidation resistance, strong stability and resistance to electrolyte corrosion

Method used

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  • Electrolytic bath for aluminium electrolysis and electrolysis technology using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Fe, Cu, Ni and Sn metal blocks are mixed according to the ratio of 23wt% Fe, 60wt% Cu, 14wt% Ni and 3wt% Sn, heated to a molten state at high temperature and then cast to obtain the anode 1 . The density of anode 1 is 8.3g / cm 3 , the specific resistance is 68μΩ·cm, and the melting point is 1360°C.

[0050] 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. The initial crystallization temperature of the electrolyte in this example was determined to be 640°C. The conductivity of the electrolyte ≈1.7Ω -1 cm -1 , density ≈2.03g / cm 3 , the saturation concentration of alumina is 5%.

[0051] The technique of using the electrolytic cell electrolytic aluminum of the present invention is:

[0052] (1) Using the anode 1 and the carbon body cathode, the above-mentioned amount of NaF, AlF 3 , LiF, KF, Al 2 o 3 First melt in the melting furn...

Embodiment 2

[0056] Fe, Cu, Ni and Sn metal blocks are mixed according to the ratio of 40wt% Fe, 36wt% Cu, 19wt% Ni and 5wt% Sn, heated to a molten state at high temperature and cast to obtain the anode 2 . The density of the anode is 8.1g / cm 3 , the specific resistance is 76.8μΩ·cm, and the melting point is 1386°C.

[0057] 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.

[0058] 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. Electrolyte conductivity ≈1.8Ω -1 cm -1 , Density ≈2.05g / cm 3 , the saturation concentration of alumina is 6%.

[0059] The technique of using the electrolytic cell electrolytic aluminum of the present invention is:

[0060] (1) Using the anode 2 and the carbon body cathode, the above-mentione...

Embodiment 3

[0064] Fe, Cu, Ni and Sn metal blocks are mixed according to the ratio of 25wt% Fe, 46.8wt% Cu, 28wt% Ni and 0.2wt% Sn, heated to a molten state at high temperature and cast to obtain the anode 3 . The density of the anode is 8.2g / cm 3 , the specific resistance is 72μΩ·cm, and the melting point is 1350°C.

[0065] 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.

[0066] 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. The conductivity of the electrolyte ≈1.6Ω -1 cm -1 , density ≈2.03g / cm 3 , the saturation concentration of alumina is 5%.

[0067] The technique of using the electrolytic cell electrolytic aluminum of the present invention is:

[0068] (1) adopt the anode 3 and the carbon body cathode, the above-m...

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Abstract

An electrolysis tank used for aluminum electrolysis, comprising a tank body, an anode and a cathode arranged within the tank body, also an electrolyte accommodated within the tank body, where at least a part of the anode is submerged in the electrolyte. The anode is arranged above the tank body. The cathode is arranged at the tank bottom and is covered by a certain amount of liquid aluminum. The electrolyte is provided between the anode and the cathode. The electrolyte covers the liquid aluminum. The tank body has arranged on an inner sidewall thereof an insulation layer for use in separating oxygen or the electrolyte from a carbon block. The tank is characterized in that: the constituents of the anode comprise Fe, Cu, Ni, and Sn, where Fe and Cu are the main constituents; the electrolyte consists of 30 to 38 wt% of NaF, 49 to 60 wt% of AlF3, 1 to 5 wt% of LiF, 1 to 6 wt% of KF, and 3 to 6 wt% of Al2O3, where the molar ratio of NaF to AlF3 is between 1.0 and 1.52. The electrolysis tank is applicable in industrialized production of electrolyzed aluminum.

Description

technical field [0001] The invention relates to an electrolytic cell for electrolytic aluminum and an electrolysis process using the electrolytic cell, belonging to the nonferrous metal smelting industry. Background technique [0002] The electrolytic aluminum industry usually uses the traditional Hall-Heroult molten salt electrolytic aluminum process to electrolyze the molten salt of cryolite-alumina in a prebaked carbon anode electrolytic cell, that is, to use cryolite Na 3 AlF 6 The fluoride salt melt is used as a flux, and the Al 2 o 3 Dissolved in fluoride salt, insert the carbon body as the anode vertically into the electrolytic cell, and use the carbon body covered with molten aluminum at the bottom of the electrolytic cell as the cathode, after passing through a strong direct current, under the high temperature condition of 940-960 ℃ , the electrochemical reaction is carried out at the two poles of the electrolytic cell, and the produced aluminum liquid product co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/06C25C3/08C25C3/12C25C3/18
CPCC25C3/12C25C3/18C25C3/08
Inventor 孙松涛方玉林
Owner INNER MONGOLIA UNITED IND
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