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化工学报  2015 

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, PP. 1498-1505

Keywords: 废弃CRT荧光粉,稀土,DDTC,浸取,沉淀,分离

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Abstract:

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5mol·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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