Method for recovering rare-earth waste material

Abstract

The invention relates to a method for recovering a rare-earth waste material. The method comprises the following steps of: (1) adding a decomposition auxiliary agent and fluxing agent powder into the rare-earth waste material, and evenly mixing to obtain mixed material, wherein the dosage of the decomposition auxiliary agent is 20-200wt% of the total weight of the rare-earth waste material, and the dosage of the fluxing agent powder is 1-20 wt% of the total weight of the rare-earth waste material; (2) roasting the mixed material obtained in the step (1) for 1-6 hours at the temperature of 600-1400 DEG C; (3) adding an acid solution into the roasted product obtained in the step (2) for acid dissolution, filtering and separating to obtain acid leaching liquor which mainly contains rare-earth elements and acid leaching residue; and (4) separating the rare-earth elements from other metal elements in the acid leaching liquor. The method provided by the invention realizes the cyclic utilization of the rare-earth waste material, is simple to operate, high in recovery rate of valuable elements in the waste material and low in reagent cost, saves energy, reduces emission and is low in environment harmfulness, and has important significance in the aspects of ecological protection and economic development promotion.

Description

technical field

[0001] The invention belongs to the technical field of regeneration treatment of rare earth wastes, and in particular relates to a recovery method of rare earth wastes. Background technique

[0002] Rare earth is an important strategic resource for my country's high-tech industry in international competition. my country is the world's largest consumer of rare earths, and due to production and use factors, a large amount of rare earth phosphors, ceramic powders, gemstone powders and other wastes are produced every year. Rare earth residues and waste materials are valuable renewable resources, and the recovery of rare earth elements from waste materials is beneficial to resource utilization and environmental protection, and is in line with national industrial policies.

[0003] At present, the resource recovery of waste fluorescent lamps at home and abroad is basically still in its infancy, and most of the phosphors are treated as special waste landfills, with...