Method for recovering rare earth from waste rare earth luminescent material

Abstract

The invention relates to a method for recovering rare earth from waste rare earth luminescent material, comprising the following steps: collection of waste rare earth luminescent material, including quick identification on rare earth fluorescent lamp and dismantling and breaking of the rare earth fluorescent lamp, breaking of a CRT display, and peeling and collection of the waste rare earth luminescent material and a glass matrix; pretreatment on the waste rare earth luminescent material, including demercuration oxidation precipitation, alkali fusion and acidolysis; extraction separation of rare earth elements to obtain rare earth chloride enrichment; extraction purification of the rare earth elements to obtain high-purity rare earth chloride; precipitation separation of the rare earth elements to obtain oxalate rare earth or carbonic acid rare earth precipitates; and sintering of the oxalate rare earth or carbonic acid rare earth precipitates to obtain high-purity-level rare earth oxide. The method realizes separation of rare earth elements including Ce, Eu, Tb and Y from impurity elements including Mg, Ba, Ca and the like and complete separation and recovery of light, mediate and heavy rare earth elements, and purification is carried out to obtain the high-purity rare earth oxide, so that the resources are comprehensively recycled, the process flow is reasonable, economic and practical, the rare earth recovery rate 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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