稀土铝酸盐系三基色荧光粉废料中除Al新工艺

• 作 者: 刘宇晖 欧阳宇平 余荣旻 王志坚
• 机 构: 湖南稀土金属材料研究院,湖南稀土新能源材料有限责任公司,
• 出 处: 稀有金属与硬质合金
• 发表日期: 2016年01期
• 关键词: 稀土 三基色荧光粉废料 除Al 有机酸钠盐 选择性沉淀

针对稀土铝酸盐三基色荧光粉废料经碱熔、酸浸后所得稀土溶液中Al含量高的情况,提出了一种有机酸钠盐或钾盐选择性沉淀除Al的方法,考察了pH值、原始Al离子浓度、温度、选择性沉淀剂加入量等实验条件对除Al效果的影响。结果表明:控制选择性沉淀前稀土溶液pH值大于2.8,于常温常压下加入理论量1.3倍以上的选择性沉淀剂,溶液中残余Al含量小于0.22g/L,Al去除率达到98.6%,REO损失率仅为0.83%。

Aiming at the selective precipitation of Al by organic acid sodium salt or potassium salt, aiming at the high Al content of rare earth aluminate trichromatic phosphor waste by alkali melting and acid leaching, the effects of pH value , The original Al concentration, temperature, the amount of selective precipitant and other experimental conditions on the removal of Al effect. The results show that the pH value of the rare earth solution before selective precipitation is more than 2.8, and the selective precipitant with the theoretical amount of 1.3 times is added at room temperature and normal pressure. The residual Al content in the solution is less than 0.22g / L and the Al removal rate reaches 98.6% REO loss rate of only 0.83%.