Aluminium electrolysis cell with insulation structure

Abstract

The invention relates to an aluminium electrolysis cell with an insulation structure. The aluminium electrolysis cell is made of a special insulation board with characteristics of high temperature resistance, light weight, blocky shape and good insulation effect, is covered between the upper part of an anode carbon block and the anode carbon block and a trough edge board, and is used for replacing the traditional mode that the upper part of a trough is insulated by using aluminum oxide and electrolyte powder. The aluminium electrolysis cell has the advantages of being good in insulation effect, being capable of remarkably reducing heat loss of the electrolysis cell, reducing working voltage, reducing direct current electricity consumption per ton of aluminum and increasing economic benefit. Meanwhile, the aluminium electrolysis cell overcomes the remarkable problems of huge workload, influence on stable work of the electrolysis cell and serious environment pollution in the traditional insulation method.

Description

technical field [0001] The invention relates to the technical field of molten salt electrolysis of nonferrous metallurgy, in particular to an aluminum electrolytic cell with a thermal insulation structure. Background technique [0002] Since the Hall-Elut cryolite molten salt electrolytic aluminum smelting method was born in 1888, it has been the only method for large-scale aluminum smelting in industry, but the utilization rate of electric energy is less than 50%, which is a major defect of the current production technology. At this stage, the loss of the power supply system generally accounts for about 5% of the power consumption, and it supplies the necessary energy for the decomposition of alumina (that is, the theoretical energy consumption, which is necessary), accounting for about 44.7% of the total energy consumption; heat loss energy Consumption accounts for about 50.3%. Power consumption generally accounts for 30-40% of the cost per ton of aluminum. Therefore, in...

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Problems solved by technology

[0002] Since the Hall-Elut cryolite molten salt electrolytic aluminum smelting method was born in 1888, it has been the only method for large-scale aluminum smelting in industry, but the utilization rate of electric energy is less than 50%, which is a major defect of the current production technology

In recent years, with the development of low-voltage electrolysis technology, the thickness of the insulation material on the upper part of the electrolytic cell has become thicker and thicker, and some enterprises have even reached more than 20cm. Although the purpose of insulation has been achieved, due to the increase in the thickness of the insulation material, it also brings There are a series of new problems: first, the workload of pole changing increases, resulting in a decrease in the efficiency of pole changing; secondly, during the process of pole changing, a large amount of material enters the electrolytic cell, which affects the stable operation of the electrolytic cell, and at the same time causes an increase in low sedimentation in the cell; again , It is easy to cause redness and melting of steel claws

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