A method for separating and recovering electrolyte components from fluorine salt system rare earth electrolysis molten salt slag

Abstract

The invention discloses a method for separating and recycling electrolyte components from fluoride salt system rare earth electrolysis molten salt slag. The method comprises the following steps of crushing the rare earth electrolysis molten salt slag, conducting vacuum distillation on the crushed rare earth electrolysis molten salt slag, collecting fluoride electrolyte after the vacuum distillation is finished, and directly returning rare earth electrolysis process. According to the method, through the method of vacuum distillation to directly recycle the fluoride electrolyte, secondary pollution does not generate during the whole recycling process, and the separated fluoride electrolyte directly returns the rare earth electrolysis process, so that the high-efficient and comprehensive recycling of rare earth, lithium, fluorine and graphite resources from the rare earth electrolysis molten salt slag can be further implemented.

Description

Technical field [0001] The present invention relates to the field of metallurgy and environmental protection, and more particularly to a method of separating an electrolyte component from a fluorine-containing system rare earth electrolyte salt residue. Background technique [0002] The preparation method of the rare earth metal (alloy) mainly includes a molten salt solution, a calcium thermal reduction method, an intermediate alloy method, and a direct reduction-distillation method of rare earth oxide. Among them, the molten salt solution is widely used in scale chemical industrial production due to its simple operation, low production cost, uniform product component, easy to control and easy to achieve continuous. However, rare earth fluoride-fluoride-oxidative rare earth systems, a rare earth metal and a rare earth alloy will result in a large amount of rare earth electrolyte salt. The production of these fused rare earth electrolyte salt residers causes the rare earth yield i...

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Problems solved by technology

[0004] Aiming at various problems existing in the existing fluorine salt system rare earth electrolytic molten salt slag treatment process, the purpose of the present invention is to provide a method for separating and recovering electrolyte components from the fluorine salt system rare earth electrolytic molten salt slag. The fluoride electrolyte is directly recovered, and the whole recovery process does not produce secondary pollution. The separated fluoride electrolyte is directly returned to the rare earth electrolysis process, and further realizes the efficient and comprehensive recovery and utilization of rare earth, lithium, fluorine and graphite resources in the rare earth electrolytic molten salt slag.

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