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Method for improving alumina dissolution rate in aluminium electrolysis process

A technology of dissolution rate and alumina, which is applied in the field of aluminum electrolysis, can solve the problems of unsatisfactory industries, and achieve the effects of energy saving, lower electrolysis temperature and low cost

Inactive Publication Date: 2013-11-13
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the temperature of the electrolyte in the electrolytic cell is lower than 945°C, there are many types of additives in the electrolyte, or the content of additives is higher than 3wt%, the above two methods have problems in industrial applications and cannot meet the requirements of the industry. The main reason why the industrial aluminum electrolysis temperature is 955-970 ℃ can often achieve the best technical indicators, and every 10 ℃ reduction in electrolysis temperature will save energy consumption by at least 300kWh / ton Al

Method used

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  • Method for improving alumina dissolution rate in aluminium electrolysis process

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Effect test

Embodiment 1

[0024] Add fluorine-carrying aluminum oxide with hydrogen fluoride content of 1wt% to the electrolyte through the feeding tube, the amount added is 1wt% of the total amount of electrolyte, when the alumina added to the electrolyte is completely dissolved and the temperature is stable again, add 1wt% to it again alumina, and so on, until the alumina added to the transparent tank no longer dissolves or the life of the quartz crucible expires. Compared with ordinary alumina (average dissolution time of 10 minutes), the dissolution time of fluorine-loaded alumina (about 6 minutes) is 60% of that of ordinary alumina.

Embodiment 2

[0026] The hydrogen fluoride content is 0.5wt% fluorine-loaded alumina is added to the electrolyte through the feeding tube, the addition amount is 1wt% of the total amount of electrolyte, when the alumina added to the electrolyte is completely dissolved and the temperature is stable again, add 1wt to it again % alumina, and so on, until the alumina added to the transparent tank no longer dissolves or the life of the quartz crucible expires. Compared with ordinary alumina (average dissolution time of 10 minutes for a single time), the dissolution time of fluorine-loaded alumina (about 7 minutes) is 70% of that of ordinary alumina.

Embodiment 3

[0028] Add 4wt% hydrogen fluoride-loaded aluminum oxide to the electrolyte through the feeding tube, the addition amount is 1wt% of the total amount of electrolyte, when the aluminum oxide added to the electrolyte is completely dissolved and the temperature is stable again, add 1wt% to it again alumina, and so on, until the alumina added to the transparent tank no longer dissolves or the life of the quartz crucible expires. Compared with ordinary alumina (single average dissolution time of 10 minutes), the dissolution time of fluorine-loaded alumina (about 4 minutes) is 40% of that of ordinary alumina.

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Abstract

Belonging to the technical field of aluminium electrolysis, the invention specifically relates to a method for improving an alumina dissolution rate in an aluminium electrolysis process. The key points lie in that, fluorinated alumina, high igloss alumina or additive-containing alumina is added into an electrolyzer as an electrolysis raw material, and hydrogen fluoride, water vapour or carbon dioxide that are escaped from an alumina dissolution process can play a stirring role, so that the dissolution rate of alumina in the electrolyzer can be greatly enhanced. With extremely simple process and low cost, the method provided in the invention can effectively improve the dissolution rate of alumina, enhance the current efficiency of the electrolysis process and reduce the electrolysis temperature, thus reducing industry energy consumption and saving energy sources, as well as being able to be widely promoted and applied in industrial production.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis, and in particular relates to a method for improving the dissolution rate of alumina in the aluminum electrolysis process. Background technique [0002] The modern aluminum electrolysis industry uses alumina as a raw material and cryolite as a flux for alumina. At the same time, in order to reduce the temperature during electrolysis, many additives are added to the flux, such as: aluminum fluoride, calcium fluoride, lithium fluoride and Magnesium fluoride etc. However, the added additives also bring about the problem of poor solubility of alumina and a decrease in the dissolution rate. The decrease in the dissolution rate of alumina will lead to a large amount of alumina precipitation at the bottom of the electrolytic cell, making it difficult to control the concentration of alumina in the electrolyte, resulting in electrolysis. During the process, the number of anode effects in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/18
Inventor 高炳亮王兆文杨酉坚石忠宁胡宪伟于亚鑫
Owner NORTHEASTERN UNIV LIAONING
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