Preparation process for extracting high-purity rare earth oxides from waste rare earth luminescent materials

Abstract

The invention discloses a preparation process for extracting high-purity rare earth oxides from waste rare earth luminescent materials. The high-purity rare earth oxides are extracted from the waste rare earth luminescent materials through the process steps of predecomposing, oxidizing roasting, acid splitting, extracting, precipitating and firing. Rare earth elements in the waste rare earth luminescent materials are all recovered and separated into single products with high purity so that the rare earth recovery range is widened by an enterprise on the basis that the waste rare earth materials is recycled in the past; and the rare earth oxides prepared by using the recovered waste rare earth materials are high in product quality, capable of realizing ammonia-free and nitrogen-free discharge in technological process and realizing pollution-free discharge, low in production cost and beneficial to the resource utilization and environmental protection and accord with the national industrial policy.

Description

technical field [0001] The invention relates to the technical field of recycling and utilizing waste rare earth luminescent materials, in particular to a preparation process for extracting high-purity rare earth oxides from waste rare earth luminescent materials. Background technique [0002] Rare earth luminescence has the advantages of strong absorption capacity, high conversion efficiency, and can emit spectrum from ultraviolet to infrared light, especially in the visible light region. The application of rare earth luminescent materials will bring environmental protection and energy saving, good color rendering performance and long life to the light source, which will help promote the upgrading of products in the field of lighting and display. [0003] At present, domestic waste of rare earth luminescent materials is increasing year by year. Rare earth luminescent material waste is a valuable renewable resource. Extracting rare earth oxides from waste is equivalent to o...

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Problems solved by technology

There are common problems such as low acid dissolution yield of rare earth luminescent material waste, and the chemical auxiliary materials used in the recovery of rare earth are finally discharged in the form of ammonia and nitrogen wastewater, resulting in the waste of a large number of valuable resources and serious pollution to the environment.

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