Method for recovering rare earth from waste rare earth luminescent material

A rare earth luminescent, waste technology, applied in the direction of luminescent materials, lamp/lamp material recycling, electronic waste recycling, etc., can solve problems such as mercury pollution, removal of Al impurity elements, etc., to solve environmental pollution, high recovery rate, protection The effect of the environment

Inactive Publication Date: 2012-09-12
UNIV OF SCI & TECH BEIJING
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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 flu

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  • Method for recovering rare earth from waste rare earth luminescent material
  • Method for recovering rare earth from waste rare earth luminescent material
  • Method for recovering rare earth from waste rare earth luminescent material

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[0054] Example 1

[0055] Discarded fluorescent lamps and CRT monitors are disassembled and broken, and mercury vapor is collected under negative pressure. The concentration of waste phosphor is 20 wt % Acetone solution for cleaning, using 0.8g / L potassium permanganate for oxidative mercury removal for 4h, zinc sulfide addition of 0.8g / L cleaning solution, precipitation of Hg by sulfurization 2+ , Finally, the residual mercury in the phosphor is removed by activated carbon.

[0056] Mix the cleaned waste rare earth luminescent material with alkali (NaOH) and stir evenly, add water according to the mass ratio of 1:6 and stir evenly, then the alkali fusion product obtained after alkali fusion at 800°C for 1 hour, wash with secondary deionized water Removal of remaining NaOH and part of NaAlO 2 Obtain rare earth-containing insoluble matter. Use 6mol / L hydrochloric acid for acid hydrolysis at 70°C for 2 hours, the solid-liquid ratio of insoluble matter to hydrochloric acid is 1:10, t...

Example Embodiment

[0063] Example 2

[0064] Discarded fluorescent lamps and CRT monitors are disassembled and broken, and mercury vapor is collected under negative pressure. The concentration of used phosphor is 30 wt % Acetone solution is cleaned, and the concentration of 1g / L potassium permanganate is used for oxidative mercury removal for 5 hours to remove residual mercury in the phosphor.

[0065] Mix the cleaned waste rare earth luminescent material with alkali (KOH) and stir evenly, add water according to the mass ratio of 1:10 and stir evenly, and then the alkali fusion product obtained after alkali fusion at 1000 ℃ for 3 hours, wash with secondary deionized water Removal of remaining KOH and part of KAlO 2 Obtain rare earth-containing insoluble matter. Use 8mol / L hydrochloric acid for acid hydrolysis at 60°C for 4 hours, the solid-liquid ratio of insoluble matter to hydrochloric acid is 1:3, the acid hydrolysis solution is adjusted to pH 4 with ammonia water, and 5 is added wt % PAC floccu...

Example Embodiment

[0072] Example 3

[0073] Discarded fluorescent lamps and CRT monitors are disassembled and broken, and mercury vapor is collected under negative pressure. The concentration of used phosphor is 10 wt % Acetone solution is cleaned, and the concentration of 0.2g / L potassium permanganate is used for oxidative mercury removal for 0.5h to remove residual mercury in the phosphor.

[0074] Mix the cleaned waste rare earth luminescent materials with alkali (NaOH) and stir evenly, add water according to the mass ratio of 1:2 and stir evenly, then alkali fusion at 1200℃ for 5 hours to obtain the alkali fusion product, wash with secondary deionized water Removal of remaining NaOH and part of NaAlO 2 Obtain rare earth-containing insoluble matter. Use 3mol / L hydrochloric acid for acid hydrolysis at 80℃ for 6 hours, the solid-liquid ratio of insoluble matter to hydrochloric acid is 1:5, the acid hydrolysis solution is adjusted to pH 5 with ammonia water, and 2 is added wt % PAC flocculant to r...

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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

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Claims

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Application Information

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Owner UNIV OF SCI & TECH BEIJING
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