Method for recovering rare earth from waste rare earth luminescent material

Abstract

A method for separating and recovering rare earths from waste rare earth luminescent materials. The process steps are: collection of waste rare earth luminescent materials, including rapid identification of rare earth fluorescent lamps and their dismantling and breaking, crushing of CRT displays, and stripping of waste rare earth luminescent materials from glass substrates and collection; pretreatment of waste rare earth luminescent materials, including demercury oxidation precipitation, alkali fusion and acid hydrolysis; extraction and separation of rare earth elements to obtain rare earth chloride enrichment; extraction and purification of rare earth elements to obtain high-purity rare earth chlorides; rare earth elements Precipitation and separation of rare earth oxalate or rare earth carbonate precipitates; rare earth oxalate or rare earth carbonate precipitates are roasted to obtain high-purity rare earth oxides. This method realizes the separation of rare earth elements Ce, Eu, Tb, Y and impurity elements such as Mg, Ba, Ca, and the complete separation and recovery of light, medium and heavy rare earth elements, and purifies to obtain high-purity rare earth oxides, so that resources are comprehensively recovered Utilization, the technological process is reasonable, economical and practical, the recovery rate of rare earth is high, and the added value of the product is high.

Description

technical field [0001] The invention belongs to the field of resource recycling, in particular to a method for comprehensively recovering rare earths from waste rare earth luminescent materials. Background technique [0002] The amount of rare earth is increasing day by day, and its strategic position is increasingly prominent. It is known as "industrial monosodium glutamate" and "industrial vitamin". Agriculture and animal husbandry and other fields. my country is the country with the most abundant rare earths in the world. It has provided more than 90% of the world's rare earth demand for a long time. As a result, my country's share of the world's total has dropped from 74% in the 1970s to 33%. Environmental pollution is serious and ecological damage has intensified. [0003] The development space and potential of my country's rare earth secondary resource recovery are huge. At present, the output and usage of fluorescent lamp tubes in my country rank first in the world....

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for recovering rare earth from waste rare earth luminescent materials, through the collection, pretreatment, extraction and separation, extraction and purification, precipitation and roasting of waste rare earth luminescent materials, to solve the problem of recycling waste rare earth fluorescent lamps and their waste rare earth luminescent materials The problems of mercury pollution in reuse, disintegration of ceramic phase crystal structure and removal of Al impurity elements can minimize the secondary pollution in the recycling process, and at the same time improve the recovery rate of rare earths and facilitate industrial production

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