A composite anode for aluminum electrolytic cell

Abstract

Disclosed is a composite anode for an aluminum electrolytic cell, relating to the technical field of aluminum electrolysis. In order to solve the disadvantages existing in separately adding raw materials to a liquid electrolyte in an electrolytic cell, the technical solution employed is adding a filler (2) in an aluminum frame (3) with a built-in conductor (4), wherein the filler (2) comprises raw materials, which are alumina used for preparing metallic aluminum, or alumina and the corresponding alloy element oxides or alloy element fluorides used for preparing an aluminum alloy. The raw materials are directly added to the composite anode, the adding manners for the raw materials are increased and the raw material addition region is enlarged, so that the raw materials continuously, slowly and simultaneously enter and disperse in a wide range of electrolyte regions. Even at low electrolysis temperature conditions, the raw materials added to the liquid electrolyte can rapidly and completely dissolve with less generation of precipitate at the furnace bottom. Operating at a lower electrolysis temperature can reduce heat loss in the electrolytic cell, increase current efficiency, increase yield, reduce carbon consumption, reduce energy consumption, and reduce fluorine gas emissions.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis, in particular to a composite anode of an aluminum electrolysis cell. Background technique [0002] At present, the electrolytic cell for producing metal aluminum or aluminum alloy uses carbon material as the anode, uses cryolite (the main component of the electrolyte) as the flux, and adds aluminum fluoride, magnesium fluoride, calcium fluoride and lithium fluoride to the electrolyte. In order to improve the physical and chemical properties of the electrolyte, alumina is used as a raw material for the production of metal aluminum, and alumina and other metal oxides or other metal fluorides are used as raw materials for the production of aluminum alloy. These materials used in the electrolytic cell are added to different positions of the electrolytic cell separately and independently: before the preparation of metal aluminum or aluminum alloy, the carbon material is first made into a...

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Problems solved by technology

[0003] When producing anode carbon block or anode paste, calcined petroleum coke is used as aggregate, but in the process of producing calcined petroleum coke, a large amount of pollutants that are difficult to handle are produced, and the content of calcined petroleum coke is high in ash and sulfur, which affects Product quality and environmental pollution; the raw materials used in the production of metal aluminum or aluminum alloy are added to the liquid electrolyte around the anode through an independent point-type feeding mechanism or manual addition. Large, resulting in limited diffusion range of raw materials, slow dissolution rate, easy to form precipitates, large fluctuations and uneven electrolyte composition, difficult and imprecise control of electrolyte composition, affecting the stable operation and efficiency of the electrolytic cell; at the same time, in order to improve the raw material in the electrolyte Higher dissolution rate and solubility, reduce precipitation at the bottom of the furnace, use higher electrolysis temperature, increase heat loss, increase liquid electrolyte volatilization loss, increase energy consumption and waste, and affect the life of the electrolytic cell

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