Method for recovering rare earth fused salt from rare earth waste graphite

Abstract

The invention discloses a method for recovering rare earth fused salt from rare earth waste graphite. The method comprises the following steps: crushing and grinding waste graphite in sequence to obtain graphite powder with the particle size of less than or equal to 200 meshes; the method comprises the following steps: adding a flotation aid into graphite powder, uniformly mixing, adding into a flotation tank after uniformly mixing, adding water, uniformly stirring, adding a flotation reagent while stirring, and carrying out flotation treatment to obtain flotation overflow and flotation underflow; obtained flotation overflow is dried, and graphite powder is obtained and sold as a product; and the obtained flotation underflow is roasted, pure rare earth fused salt is obtained after roasting, and the obtained rare earth fused salt is directly used as a raw material for rare earth electrolysis to be reused. By adopting the process method which is simple and convenient to operate, the rare earth fused salt and the waste graphite can be effectively separated, and value-added utilization of the rare earth fused salt and the waste graphite is realized; the labor productivity is high, the treatment effect is high, and the obtained rare earth fused salt is high in purity and can be directly utilized.

Description

1. Technical field: [0001] The invention relates to the application field of rare earth electrolytic waste graphite materials, in particular to a method for recovering rare earth molten salt from rare earth waste graphite. 2. Background technology: [0002] Graphite has excellent electrical and thermal conductivity, high temperature resistance, and acid and alkali corrosion resistance. Graphite is a commonly used material for the production of rare earth metals by molten salt electrolysis. It is generally used as an anode and electrolytic cell, and is an important material in the electrolysis process of rare earth metals. However, graphite materials have low density, high porosity, poor oxidation resistance and corrosion resistance. During use, molten salt is easy to penetrate into graphite anode, graphite groove and graphite filling layer. Under normal production conditions, rare earth electrolysis regularly produces waste graphite anodes, waste graphite tanks and waste gr...

AI Technical Summary

Problems solved by technology

[0004] The existing problems of the above-mentioned existing gravity separation method for processing waste graphite are: the waste graphite material needs multiple grinding and sieving, multiple gravity separations are required, the labor productivity is low, and only relying on gravity separation cannot completely separate rare earth molten salt and Waste graphite, the purity of rare earth molten salt obtained is low, no more than 93%, cannot be used directly, and needs secondary treatment