| 废弃CRT荧光粉中稀土的提取工艺与技术 |
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| 引用本文： | 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. |
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| 作者姓名： | 申星梅 李辽沙 武杏荣 王平 王莲贞 |
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| 作者单位： | 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 |
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| 基金项目： | 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)~~ |
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| 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。
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| 关 键 词： | 废弃CRT荧光粉 稀土 DDTC 浸取 沉淀 分离 |
| 收稿时间： | 2014-10-15 |
| 修稿时间： | 2014-12-24 |
Recovery of rare earth from waste CRT phosphor |
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| SHEN Xingmei;LI Liaosha;WU Xingrong;WANG Ping;WANG Lianzhen.Recovery of rare earth from waste CRT phosphor[J].Journal of Chemical Industry and Engineering(China),2015,66(4):1498-1505. |
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| Authors: | SHEN Xingmei;LI Liaosha;WU Xingrong;WANG Ping;WANG Lianzhen |
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| Affiliation: | Key Laboratory of Metallurgical Emission Reduction & Resources Recycling of Ministry of Education, Anhui University of Technology, Ma'anshan 243002, Anhui, China |
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| 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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| Keywords: | waste CRT phosphor rare earth DDTC leaching precipitation separation |
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