废弃CRT荧光粉中稀土的提取工艺与技术

doi:10.11949/j.issn.0438-1157.20141555

化工学报 ›› 2015, Vol. 66 ›› Issue (4): 1498-1505.DOI: 10.11949/j.issn.0438-1157.20141555

废弃CRT荧光粉中稀土的提取工艺与技术

申星梅, 李辽沙, 武杏荣, 王平, 王莲贞

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

收稿日期:2014-10-15 修回日期:2014-12-24 出版日期:2015-04-05 发布日期:2015-04-05
通讯作者: 申星梅
作者简介:申星梅(1982-),女,博士,讲师。
基金资助:
国家自然科学基金项目(51302003);安徽省高等学校省级自然科学研究项目(KJ2012A041);安徽省科技厅项目(1306c083017)。

Recovery of rare earth from waste CRT phosphor

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

Key Laboratory of Metallurgical Emission Reduction & Resources Recycling of Ministry of Education, Anhui University of Technology, Ma'anshan 243002, Anhui, China

Received:2014-10-15 Revised:2014-12-24 Online:2015-04-05 Published:2015-04-05
Supported by:
supported by the National Natural Science Foundation of China(51302003), the University Science Research Project of Anhui Province (KJ2012A041) and Anhui Science& Technology Department Foundation of China (1306c083017).

摘要/Abstract

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。

关键词: 废弃CRT荧光粉, 稀土, DDTC, 浸取, 沉淀, 分离

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.

Key words: waste CRT phosphor, rare earth, DDTC, leaching, precipitation, separation

中图分类号:

TQ09

申星梅, 李辽沙, 武杏荣, 王平, 王莲贞. 废弃CRT荧光粉中稀土的提取工艺与技术[J]. 化工学报, 2015, 66(4): 1498-1505.

SHEN Xingmei, LI Liaosha, WU Xingrong, WANG Ping, WANG Lianzhen. Recovery of rare earth from waste CRT phosphor[J]. CIESC Journal, 2015, 66(4): 1498-1505.

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废弃CRT荧光粉中稀土的提取工艺与技术

Recovery of rare earth from waste CRT phosphor

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