Heat preserving and oxidation resisting method in aluminum electrolysis cell production and heat preserving covering device

Abstract

The invention discloses a heat preserving and oxidation resisting method in aluminum electrolysis cell production and a heat preserving covering device. The invention adopts a movable and monoblock heat preserving covering device formed by connection of steel member plates and heat preserving refractory material blocks to cover each positive electrode of an aluminum electrolysis cell and the ends as well as the lateral parts of the aluminum electrolysis cell, so that the effective heat preservation of the aluminum electrolysis cell can be realized and positive electrode surface oxidation of the aluminum electrolysis cell can be prevented. In the invention, the mode of employment of a mixed covering material layer composed of alumina and an electrolyte in the prior art is completely discarded. Compared with the prior art, the heat preserving covering device of the invention not only has the advantages of convenient operation, low running cost, labor saving, time saving, and high working efficiency, but also has the advantages of simple structure, good and stable heat preserving and oxidation resisting effects, resource saving, low requirements for the experience and technical level of operators, as well as convenience for mass production and standardized production, etc.

Description

technical field [0001] The invention relates to a method for heat preservation and anti-oxidation during production of an aluminum electrolytic cell and a heat preservation covering device, belonging to the technical field of heat preservation and anti-oxidation of an aluminum electrolytic cell. Background technique [0002] At present, in the production and operation of the existing aluminum electrolytic cell, it is generally used to cover the anode of the aluminum electrolytic cell with a layer of scattered covering material layer composed of a mixture of electrolyte particles and alumina particles of different particle sizes for heat preservation and prevention. The surface of the anode is oxidized, and the covering material layer is mainly formed by adding cranes and laying manually. The existing method of using a loose covering material layer for heat preservation and oxidation prevention has the following problems in production and use: [0003] 1. The laying of the e...

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Problems solved by technology

[0003] 1. The laying of the existing covering material layer depends entirely on the experience of the operator. The thickness of the covering material layer is uneven, and the uniformity of the covering layer thickness is difficult to guarantee, resulting in poor thermal insulation uniformity

[0004] 2. The existing aluminum oxide and electrolyte mixed covering material, when the electrolysis temperature rises, especially when the effect occurs or the tank condition fluctuates for a long time, it is easy to melt into the tank, causing the tank condition and its own thermal insulation performance to deteriorate;

[0005] 3. The main components of the existing covering layer are alumina and electrolyte particles, which have good fluidity and are prone to adverse conditions such as anodic oxidation, jamming of the feeding port, and fire eyes during use.

[0006] 4. Due to the effect of high temperature, the encrustation layer of the covering material is hard. When changing poles, it is necessary to use the special pneumatic hammer trolley of the multi-functional crane to forcibly break through the encrustation layer with the hammer head to pull out the residual material. Extremely, increased workload, time-consuming and labor-intensive

[0007] 5. When changing poles, crusts and alumina powder often fall into the electrolyte, resulting in unstable conditions of the electrolytic cell, large voltage fluctuations, and loss of power consumption

[0008] 6. In the electrolysis design process, in order to add covering materials, it is necessary to increase the system configuration of related alumina transportation, crane feeding, electrolyte crushing and conveying systems, which increases system investment and system operating costs

[0009] 7. In the process of electrolytic production, in order to open the crusting of the covering material when replacing the anode, it is necessary to configure the shelling tool trolley of the electrolytic multifunctional crane, which increases the system investment and system operating costs

[0010] 8. In the process of electrolytic production of materials, the circulation volume of electrolyte materials is relatively large, and a considerable part of the circulation volume comes from the anode covering material, which leads to an increase in the processing volume of circulating materials and increases the processing cost. At the same time, this part of electrolyte materials also Increased funding backlog

[0011] Due to the above problems, the existing heat preservation and oxidation prevention methods during the production of aluminum electrolytic cells are still not ideal.

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