Aluminum electrolyzing technology

A technology of electrolytic aluminum and process, applied in the field of electrolytic aluminum process, can solve the problems of primary crystal temperature containing carbon slag, achieve the effect of reducing primary crystal temperature, reducing cost, and facilitating separation

Inactive Publication Date: 2018-12-07
YINGKOU ZHONGWANG ALUMINUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the purpose of the present invention is to provide an electrolytic aluminum process, by controlling the ratio of each component, selecting a combination of different components, to solve the problems of carbon slag and high primary crystal temperature in the aluminum liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of electrolytic aluminum process, comprises the following steps:

[0024] A. Mix electrolytes other than alumina, cryolite is used as a solvent for electrolytic reaction alumina, dissolve alumina in cryolite, heat the electrolyte mixture except alumina until it is molten, and then add ice crystals containing alumina The molten rock solution is obtained, and the electrolyte is dried in an oven before mixing. The composition of the electrolyte is: 3% alumina, 25% aluminum fluoride, 5% calcium fluoride, 5% magnesium fluoride, and 32% sodium fluoride. %, lithium fluoride 2%, potassium fluoride 5%, potassium fluoroaluminate 23%;

[0025] B. Connect the electrodes of the electrolytic cell to the power supply, place the melt obtained in step A in the electrolytic cell and perform electrolysis at 820°C with a current density of 1A / cm 2 , to obtain the aluminum liquid after electrolysis, in which the height of the electrolyte melt is 25cm, the superheat of the electrolyt...

Embodiment 2

[0029] A kind of electrolytic aluminum process, comprises the following steps:

[0030] A. Mix electrolytes other than alumina, cryolite is used as a solvent for electrolytic reaction alumina, dissolve alumina in cryolite, heat the electrolyte mixture except alumina until it is molten, and then add ice crystals containing alumina The molten rock solution is obtained, and the electrolyte is dried in an oven before mixing. The composition of the electrolyte is: 6% alumina, 25% aluminum fluoride, 2% calcium fluoride, 2% magnesium fluoride, and 35% sodium fluoride. %, lithium fluoride 3%, potassium fluoride 2%, potassium fluoroaluminate 25%;

[0031] B. Connect the electrodes of the electrolytic cell to the power supply, place the melt obtained in step A in the electrolytic cell and perform electrolysis at 820°C with a current density of 1A / cm 2 , to obtain the aluminum liquid after electrolysis, in which the height of the electrolyte melt is 20cm, the superheat of the electrolyt...

Embodiment 3

[0035] A kind of electrolytic aluminum process, comprises the following steps:

[0036] A. Mix electrolytes other than alumina, cryolite is used as a solvent for electrolytic reaction alumina, dissolve alumina in cryolite, heat the electrolyte mixture except alumina until it is molten, and then add ice crystals containing alumina The molten rock solution is obtained, and the electrolyte is dried in an oven before mixing. The composition of the electrolyte is: 3% alumina, 30% aluminum fluoride, 2% calcium fluoride, 3% magnesium fluoride, and 35% sodium fluoride. %, lithium fluoride 5%, potassium fluoride 2%, potassium fluoroaluminate 20%;

[0037] B. Connect the electrodes of the electrolytic cell to the power supply, place the melt obtained in step A in the electrolytic cell and perform electrolysis at 820°C with a current density of 1A / cm 2 , to obtain the aluminum liquid after electrolysis, in which the height of the electrolyte melt is 20cm, the superheat of the electrolyt...

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Abstract

The invention belongs to the field of metal smelting, and relates to an aluminum electrolyzing technology. Electrolyte material components except alumina are mixed (cryolite is used as a solvent for electrolytic reaction of the alumina); the mixture is heated to a molten state, and a melt is obtained by adding the alumina; the obtained melt is electrolyzed at the temperature of 800-820 DEG C, current density is 1A / cm<2>, and aluminum liquid is obtained; the aluminum liquid obtained is stirred and filtered to remove slag inclusion impurities from the aluminum liquid to obtain pure aluminum liquid; and packaging is conducted finally. Through controlling proportions of components and selecting the combination of different components, the problems that carbon slag is contained in electrolytesand primary crystal temperature is high in the electrolytic aluminum industry are solved.

Description

technical field [0001] The invention belongs to the field of metal smelting and relates to an electrolytic aluminum process. Background technique [0002] Electrolytic aluminum is aluminum obtained by electrolysis. The modern electrolytic aluminum industry uses cryolite-alumina molten salt electrolysis. The molten cryolite is the solvent, the alumina is the solute, the carbonaceous body is the anode, and the aluminum liquid is the cathode. After a strong direct current is applied, the electrochemical reaction is carried out on the two electrodes in the electrolytic cell at 950°C-970°C. Namely electrolysis. At present, in the process of large-scale electrolytic aluminum, more attention is usually paid to energy saving, and the purpose of energy saving is achieved by reducing the primary crystal temperature. In the current existing technology, the primary crystal temperature is basically 820 ° C, and the aluminum liquid is separated. When the aluminum liquid is easily mixed...

Claims

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Application Information

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IPC IPC(8): C25C3/18
CPCC25C3/18
Inventor 刘磊雷轶李连得
Owner YINGKOU ZHONGWANG ALUMINUM CO LTD
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