Aluminum electrolysis process parameter optimization method and aluminum electrolysis cell group

Abstract

The invention relates to an aluminum electrolysis process parameter optimization method and an aluminum electrolysis cell group. The method comprises the following steps of 1) searching one or more aluminum electrolysis cells with optimal operation according to a preset optimal standard; 2) obtaining the technological parameters of the aluminum electrolysis cells with the optimal operation as optimized technological parameters; and 3) controlling other controlled electrolytic cells according to the optimized process parameters; and the optimal standard at least comprises that the current efficiency is higher than a set current efficiency value, the average working voltage of the cells is lower than a set average working voltage value of the cells, and the optimized process parameters comprise one or two combinations or above of the following parameters of electrolyte temperature, electrolyte molecular ratio, alumina concentration and polar distance. According to the method, process parameters of an existing well-operated electrolytic cells are directly copied to other common-operated electrolytic cells, and a complex process parameter control model and related calculation are skipped out, so that the simplification of electrolytic cell control is realized.

Description

technical field [0001] The invention relates to an aluminum electrolysis process parameter optimization method and an aluminum electrolysis cell group, and belongs to the technical field of aluminum electrolysis cell energy saving. Background technique [0002] The industrial production of aluminum electrolysis adopts cryolite-alumina molten salt electrolysis method. The so-called cryolite-alumina molten salt is a multiphase electrolyte system composed of cryolite-based fluoride salt as a flux and alumina as a melt. The carbon body is used as the anode, and the aluminum liquid is used as the cathode. After passing through a strong direct current, the electrochemical reaction is carried out on the two electrodes in the electrolytic cell at 920°C-970°C. The chemical reaction is mainly carried out by the following equation: 2Al 2 o 3 +3C=4Al+3CO 2 . The anode products are mainly carbon dioxide and carbon monoxide gas, and the cathode products are aluminum liquid. [0003]...

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Problems solved by technology

[0009] However, due to the fact that the electrolytic cell can be used to control the system's real-time acquisition data very little, and the energy balance and material balance affect each other, it is difficult to achieve the stability of the electrolytic reaction and improve the current efficiency to achieve the maximum energy saving. The reality is often to ensure the electrochemistry. The basic conditions of the reaction and the safety and stability of the electrolytic cell and the electrolytic reaction, without sacrificing the current efficiency to increase energy consumption

Energy balance, the most basic process condition of the electrolysis process, cannot be adjusted independently in real time, so it is difficult to ensure that the electrolysis process is in an optimized state; it is difficult to achieve the stability of the aluminum electrolysis process and the optimal balance of energy saving.

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