Recovery of rare earth from waste CRT phosphor

SHEN Xingmei; LI Liaosha; WU Xingrong; WANG Ping; WANG Lianzhen

doi:10.11949/j.issn.0438-1157.20141555

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Recovery of rare earth from waste CRT phosphor

更新时间：2025-12-10

- Recovery of rare earth from waste CRT phosphor
- CIESC Journal Issue 4, Pages: 1498-1505(2015)
- 作者机构：
  
  安徽工业大学教育部冶金减排与资源综合利用重点实验室,安徽,马鞍山,243002
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20141555
  CLC： Q09
- Online First：05 April 2015，
  
  Published：05 April 2015
- 稿件说明：
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SHEN Xingmei, LI Liaosha, WU Xingrong, et al. Recovery of rare earth from waste CRT phosphor[J]. CIESC Journal, 2015, (4): 1498-1505.
DOI：

SHEN Xingmei, LI Liaosha, WU Xingrong, et al. Recovery of rare earth from waste CRT phosphor[J]. CIESC Journal, 2015, (4): 1498-1505. DOI： 10.11949/j.issn.0438-1157.20141555.

摘要

以废弃CRT荧光粉为原料

在前期稀盐酸预处理工艺的基础上

通过进一步深入研究

开发出从废弃CRT荧光粉中提取稀土的完整工艺路线。结果表明:稀酸预处理后

盐酸酸浸剩余荧光粉固体的最佳浓度为5 mol·L-1

最佳反应温度为80℃;酸浸后稀土浸出液净化除杂的pH控制为5.5

DDTC最佳用量比为6:1;稀土净化液经草酸沉淀后煅烧的最佳温度为900℃。从废弃CRT荧光粉中提取到稀土产物Y2O3和Eu2O3的总含量为99.2%

其晶粒由若干片状晶体密实堆积成多面体结构

晶粒之间相互嵌入

呈镶嵌式接触。

Abstract

On the basis of dilute hydrochloric acid pretreatment

recovery of rare earth from waste CRT phosphor was further studied

and a process route was developed. After dilute acid pretreatment

optimum conditions for recovering rare earth from waste CRT phosphor were: concertration of hydrochloric acid for hydrolysis of residual phosphor solids 5 mol·L-1

reaction temperature 80℃

pH value of leaching liquor after hydrolysis reaction 5.5

ratio of diethyldithiocarbamate (DDTC) and phosphors dosage 6:1

calcination temperature of rare earth oxalate precipitation 900℃. The total content of rare earth products Y2O3 and Eu2O3 was 99.2%. The crystal particles of rare earth product possessed polyhedral structure built by the accretion of flaky crystals. The particles were embeded in each other with mosaic contact.

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