A low temperature control method for aluminum electrolysis

A control method and technology for aluminum electrolysis, applied in the field of aluminum electrolysis, can solve the problems of unstable operation of the electrolytic cell, difficult low temperature control, and difficulty in maintaining the electrolyte, and achieve good popularization and application value, prevent abnormal cell voltage, and prevent voltage fluctuations. Effect

Inactive Publication Date: 2011-12-28
YUNNAN YONGXIN ALUMINUM +1
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Problems solved by technology

However, it is difficult to control the low temperature. If the temperature is too low, there are many sudden effects, and the electrolyte is not easy to maintain, resulting in problems such as too thick sides, too large legs, extremely long corners and increased precipitation, resulting in unstable operation of the electrolytic cell and current Reduced efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The electrolysis temperature of the aluminum electrolytic cell is set to 936°C, the lithium carbonate content in the electrolyte is 2.8% of the electrolyte mass fraction, the molecular ratio of sodium fluoride to aluminum fluoride in the electrolyte is 2.5, and the aluminum level is 26 cm. In conjunction with the compulsory insulation measures of the electrolytic cell, the bottom and small windows of the electrolytic cell are sealed with aluminum silicate fiber blanket insulation materials. The current efficiency is 94.91%, and the DC power consumption is 12400kwh / t.AL.

Embodiment 2

[0018] The electrolysis temperature of the aluminum electrolytic cell is set to 933°C, the lithium carbonate content in the electrolyte is 2.9% by mass of the electrolyte, and the molecular ratio of sodium fluoride to aluminum fluoride in the electrolyte is 2.4. The aluminum level is 27cm. In conjunction with the compulsory insulation measures of the electrolytic cell, the bottom and small windows of the electrolytic cell are sealed with aluminum silicate fiber blanket insulation materials. The current efficiency is 95.21%, and the DC power consumption is 12240 kwh / t.AL.

Embodiment 3

[0020] The electrolysis temperature of the aluminum electrolytic cell is set to 930°C, the lithium carbonate content in the electrolyte is 3% of the electrolyte mass fraction, the molecular ratio of sodium fluoride to aluminum fluoride in the electrolyte is 2.3, and the aluminum level is 28 cm. In conjunction with the compulsory insulation measures of the electrolytic cell, the bottom and small windows of the electrolytic cell are sealed with aluminum silicate fiber blanket insulation materials. The current efficiency is 95.69%, and the DC power consumption is 11878kwh / t.AL.

[0021] After the above implementation, the cell temperature of the electrolytic cell has dropped significantly, the electrolytic cell has realized low-temperature stable production, the phenomenon of the angle pole extending leg length has been significantly reduced, the precipitation and crusts in the electrolytic cell have been reduced, and the inner shape of the furnace has been significantly improved tha...

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Abstract

The invention relates to a low temperature control method for aluminum electrolysis. 1) The electrolysis temperature during electrolysis is 930-936°C, the lithium carbonate content in the electrolyte is 2.8-3.0% of the mass fraction of the electrolyte, the molecular ratio of sodium fluoride to aluminum fluoride in the electrolyte is 2.3-2.5; the aluminum level is not low 2) Compulsory thermal insulation measures for the electrolytic cell: the bottom of the cell and the small window are sealed with aluminum silicate fiber blanket thermal insulation material. In the case of not changing the equipment and facilities in the production of aluminum electrolysis, by adjusting the electrolysis process, regularizing the furnace, realizing fine operation, improving the stability of the electrolytic cell, strengthening heat preservation, reducing heat loss, lowering the electrolysis temperature, and improving the current efficiency, the electrolytic cell The service life has been extended, and the effect of energy saving and emission reduction is remarkable, which provides a guarantee for the realization of safety, high efficiency, energy saving and environmental protection in electrolytic production.

Description

Technical field [0001] The invention relates to the technical field of aluminum electrolysis, and is a low temperature control method for aluminum electrolysis. Background technique [0002] As a high energy consumption industry, energy saving and consumption reduction have become the survival way of the current aluminum industry. Theoretically, without changing the equipment and facilities in aluminum electrolysis production, the current efficiency will increase by 1% for every 10°C decrease in temperature. Therefore, it is of important and far-reaching significance to explore low temperature control technology, improve current efficiency, and reduce electricity consumption per ton of aluminum. However, it is difficult to control low temperature. If the temperature is too low, there are many sudden effects, and the electrolyte is not easy to maintain. It will cause problems such as too thick furnace wing, too large legs, corners easy to be long, and increased precipitation. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/20
Inventor 杨叶伟熊自勇王建平赵瑞敏张玉生信伟松普光平赵士堂刘宇坤龙国辉丁增和李伟林
Owner YUNNAN YONGXIN ALUMINUM
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