Composite anode of aluminum electrolytic cell

Abstract

The invention relates to the technical field of aluminum electrolysis, in particular to a composite anode of an aluminum electrolytic cell. In order to overcome the defect of the mode that raw materials are added into a liquid electrolyte in the electrolytic cell separately, according to the adopted technical scheme, filler is added to an aluminum frame with a built-in conductor, and the filler comprises the raw materials; the raw materials are aluminum oxides used for preparing metal aluminum or aluminum oxides and corresponding alloy element oxides or alloy element fluorides for preparing aluminum alloy; and the raw materials are directly added into the composite anode, the raw material adding modes and the raw material adding areas are increased, thus, the raw materials continuously andslowly enter and disperse in the large-area electrolyte area simultaneously, even under the low electrolysis temperature condition, the raw materials added in the liquid electrolyte can be rapidly and completely dissolved, less precipitation is generated at the furnace bottom, the low electrolysis temperature is adopted for operation, heat losses of the electrolytic cell can be reduced, the current efficiency is improved, the yield is increased, carbon consumption is reduced, energy consumption is reduced, and emission of fluorine-containing gas is reduced.

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, 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, aluminum oxide is used as a raw material for preparing metal aluminum, and aluminum oxide and other metal oxides or other metal fluorides are used as raw materials for preparing aluminum alloy. These materials used in the electrolytic cell are separately and independently added to different positions of the electrolytic cell: before preparing the metal aluminum or aluminum alloy, the carbon material is made into anode carbon blocks or ...

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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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