Ternary electrolyte molten salt magnesium electrolysis

Abstract

The invention discloses a molten salt magnesium electrolyzing ternary electrolyte. The compositions in percentage by mass of the ternary electrolyte are: 16 to 20 percent of MgCl2, 51 to 59 percent of NaCl, 23 to 27 percent of CaCl2 and 1.5 to 2.0 percent of calcium fluoride. The ternary electrolyte solves the problem that part commonly used electrolyte is easy to boil during production, and greatly reduces the operating temperature during normal electrolysis of an electrolytic cell; under the condition of normal operating current, the electrolytic cell can maintain excellent self-heating balance, thereby greatly reducing heat-bath tendency, obtaining ideal protection effect of liquid magnesium and slightly changing electrolyte flow characteristic; therefore, the ternary electrolyte increases the current efficiency of the electrolytic cell to a certain extent, and can obviously reduce production cost, thereby having an extensive application prospect.

Description

technical field [0001] The invention relates to a molten salt magnesium electrolysis technology, in particular to a molten salt magnesium electrolysis ternary electrolyte. Background technique [0002] Since magnesium chloride has inherent disadvantages such as high melting point, poor conductivity, strong volatility, and easy hydrolysis, the electrolyte for molten salt magnesium electrolysis is generally a complex multi-component. The electropositive properties of the cations of each component in the electrolyte, the negative properties of the anions, the electrical conductivity of the electrolyte, the primary crystal temperature, density, viscosity, and surface tension all have a great influence on electrolytic production. [0003] At present, the molten salt magnesium electrolytic electrolyte widely used at home and abroad is mostly MgCl 2 -NaCl-KCl ternary component and MgCl 2 -NaCl-CaCl 2 -KCl quaternary component, MgCl 2 -NaCl-CaCl 2 Ternary component electrolytes...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a molten salt magnesium electrolytic electrolyte that does not contain KCl, optimize the electrical conductivity of the electrolyte, the primary crystal temperature, density, viscosity and surface tension and other physical properties, so as to solve the problem of electrolyte boiling and electrolytic cell in electrolytic production. Problems such as heat tank, so that the liquid magnesium and the electrolyte can be effectively separated, and at the same time, the upper surface of the liquid magnesium can be fully protected to avoid burning, and the circulation flow characteristics of the electrolyte can be improved to improve the current efficiency and power efficiency of electrolysis production, and the inherent performance of the electrolytic cell can be maximized.

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