Aluminum electrolysis plastidome for aluminum oxide electrolysis of one-step acid solution method production and application of aluminum electrolysis plastidome

Abstract

The invention discloses an aluminum electrolysis plastidome for aluminum oxide electrolysis of one-step acid solution method production and an application of the aluminum electrolysis plastidome. The aluminum electrolysis plastidome comprises Na3AlF6, Al2O3 and an additive, wherein the additive comprises AlF3, Li2CO3, CaF2, MgF2 and Li3AlF6. The aluminum electrolysis plastidome is applied to an aluminum oxide electrolysis production process of the one-step acid solution method production; an electrolysis temperature lower than that of an electrolyte for the traditional alkaline aluminum oxide can be achieved; aluminum oxide produced by a one-step acid solution method has good solubility in the electrolyte, so that the current efficiency is improved; the purposes of energy conservation and emission reduction are better achieved; the problem of short supply of aluminum oxide domestically is solved; and a new efficient path is opened up for comprehensive utilization of pulverized fuel ash.

Description

technical field [0001] The invention relates to the technical field of alumina electrolytes, in particular to an aluminum electrolyte system for alumina electrolysis produced by a one-step acid dissolution method and its application. Background technique [0002] The electrolyte is the reaction medium for dissolving aluminum oxide and reducing it to metallic aluminum during aluminum electrolysis. Aluminum electrolysis cannot be carried out in aqueous solution, because only hydrogen can be precipitated on the cathode but not aluminum during electrolysis in aqueous solution. Therefore, it must The molten salt electrolyte is used, and the electrolyte is not only a solvent but also a medium conductor of electricity. Therefore, the industry has the following performance requirements for the electrolyte: first, it can dissolve alumina well and have high solubility; second, the electrolyte has good conductivity, which makes the resistivity of the electrolyte lower, which is benefic...

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Problems solved by technology

However, compared with the alumina products produced by the traditional Bayer method, sintering method or combined method, the alumina obtained by one-step acid-dissolving method has larger bulk density, particle size, angle of repose (fluidity), specific surface area, etc. The difference makes it impossible to apply the electrolyte system used in the production of alumina by the traditional alkaline method to the electrolysis of alumina obtained by one-step acid solution extraction.

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