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Method for removing glass residue and silicon aluminum oxide in waste rare earth phosphor

A rare-earth phosphor and silicon-aluminum oxide technology, which is applied in chemical instruments and methods, luminescent materials, recycling technology, etc., can solve the lack of literature on the removal of silicon-aluminum impurity elements, reduce the leaching rate of rare earth elements, and extract rare earth elements. Low efficiency and other problems, to achieve the effect of improving the recovery rate of rare earths, reducing the amount of materials used, and no secondary pollution

Active Publication Date: 2014-05-07
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Si-alumina impurity elements form silica-alumina colloids during acidolysis after alkali fusion of waste rare earth phosphors, which not only reduces the leaching rate of rare earth elements, but also leads to low extraction efficiency of rare earths, resulting in low recovery rates of rare earths and high recovery costs
[0003] Existing literature on the recovery of waste rare earth phosphors mainly focuses on the recovery of rare earth elements, and there are not many literatures related to the removal of silicon and aluminum impurity elements

Method used

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  • Method for removing glass residue and silicon aluminum oxide in waste rare earth phosphor

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Embodiment 1

[0027] The collected waste rare earth phosphors were pre-calcined and roasted at 300°C for 3 hours. The roasted slag was subjected to acid acid hydrolysis to obtain rare earth solution and acid hydrolysis residue. The acid hydrolysis residue was sorted by hydrocyclone, wet sieving and sedimentation combined process , hydrocyclone sorting to remove coarse glass slag, sand settling through wet sieve for re-sorting to remove medium particle glass slag, the wet sieve mesh is 400 mesh, and the undersize after overflow and wet sieving is obtained by sedimentation and filtration The acid hydrolysis slag containing fine glass slag and silicon-aluminum impurities, and the settled water are returned to the hydrocyclone separation process. For acid hydrolysis slag containing fine particle glass slag and silicon-aluminum impurities, use 30 wt % NaOH solution, leaching residual fine particles of glass slag and silicon oxide, the solid-to-liquid ratio is 1:4, the leaching temperature is 90°...

Embodiment 2

[0030] The collected waste rare earth phosphors were pre-calcined and roasted at 400°C for 3.5 hours. The roasted residue was subjected to acid acid hydrolysis to obtain rare earth solution and acid hydrolysis residue. The acid hydrolysis residue was separated by shaking table, wet sieving and sedimentation. The hydrocyclone sorts to remove the coarse glass slag, and the sand settling is re-sorted through the wet sieve to remove the medium-sized glass slag. The mesh of the wet sieve is 300 mesh. Fine particle glass slag and acid hydrolysis slag of silicon-aluminum impurities, and settled water are returned to the hydrocyclone sorting process. For acid hydrolysis slag containing fine particle glass slag and silicon-aluminum impurities, use 30 wt % KOH solution, leaching residual fine particles of glass slag and silicon oxide, the solid-liquid ratio is 1:5, the leaching temperature is 100°C, and the leaching time is 1.5h. Alkali washing slag can remove glass slag and silicon-al...

Embodiment 3

[0033]The collected waste rare earth phosphors are pre-roasted and roasted at 500°C for 4 hours. The roasted residue is subjected to acid acid hydrolysis to obtain rare earth solution and acid hydrolysis residue. The hydrocyclone sorts to remove the coarse glass slag, and the sand settling is re-sorted through the wet sieve to remove the medium-sized glass slag. The mesh of the wet sieve is 300 mesh. Fine particle glass slag and acid hydrolysis slag of silicon-aluminum impurities, and settled water are returned to the hydrocyclone sorting process. Acid hydrolysis slag containing fine particle glass slag and silicon-aluminum impurities, using 50 wt % NaOH solution and KOH solution mixture, leaching residual fine glass slag and silicon oxide, the solid-liquid ratio is 1:6, the leaching temperature is 60°C, and the leaching time is 2h. Alkali washing slag can remove glass slag and silicon-aluminum oxide impurities in waste rare earth phosphors through alkali fusion and water was...

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Abstract

The invention belongs to the field of resource recycling, and in particular relates to a method for removing silicon aluminum impurities in waste rare earth phosphor. The method comprises the steps of sequentially implementing pre-baking, acidolysis and filter pressing to the waste rare earth phosphor to obtain acidolysis residue; hydraulically removing coarse granular glass residue in the acidolysis residue, removing medium-granular glass residue through wet sieving, and dissolving fine-granular glass residue and silicon aluminum oxide through hot alkali. The method disclosed by the invention can effectively remove coarse, medium and fine-granular glass residue as well as other silicon aluminum oxide impurities in the waste rare earth phosphor, so as to avoid influence on rare earth element leaching and extraction separation due to silicon aluminum colloid formed in a subsequent rare earth element recovery process. The method disclosed by the invention has the characteristics that silicon aluminum impurities in the waste rare earth phosphor can be effectively removed, the rare earth recovery rate is remarkably improved, the production is reduced, and the method is applicable to industrial production and the like.

Description

technical field [0001] The invention belongs to the field of resource recycling, and in particular relates to a method for removing glass slag and silicon-aluminum oxide in waste rare earth fluorescent powder. Background technique [0002] The collected waste rare earth phosphor generally contains about 25% of glass slag (calculated as silicon dioxide) and about 15% of silicon-aluminum oxide (calculated as aluminum oxide) powder in the isolation layer. Si-alumina impurity elements form silica-alumina colloids during acidolysis after alkali fusion of waste rare earth phosphors, which not only reduces the leaching rate of rare earth elements, but also leads to low extraction efficiency of rare earths, resulting in low recovery rates of rare earths and high recovery costs. [0003] The existing literature on recycling waste rare earth phosphors mainly focuses on the recovery of rare earth elements, and there are not many literatures related to the removal of silicon and aluminu...

Claims

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Application Information

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IPC IPC(8): C09K11/01
CPCY02W30/50
Inventor 张深根刘虎潘德安田建军刘波吴茂林
Owner UNIV OF SCI & TECH BEIJING
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