氨水为沉淀剂从水晶石废料中提纯二氧化铈的实验研究

Experimental research for purification of cerium dioxide from rock crystal waste with ammonia as precipitator

以工业固体废弃物水晶石为原料,采取一定方法将二氧化硅与二氧化铈分离后进行二氧化铈的提取,有效解决废弃物堆放并实现其资源化。以氨水为沉淀剂,将分离后的二氧化铈进行提纯,研究了氨水浓度、静置时间、pH、焙烧温度和时间对二氧化铈纯度和质量的影响。实验结果表明:在氨水浓度为6 mol/L、pH=8、静置30 min、焙烧温度为450℃、焙烧时间为2 h条件下,得到二氧化铈的含量接近原料的实际值。

Using industrial solid waste rock crystal as raw material, cerium dioxide was extracted through the separation from silica with a certain method. In this way, the problem of waste dump could be effectively solved and rock crystal could be changed into resource.After separation, cerium dioxide was purified with ammonia as precipitator.Influences of concentration of ammonia,setting time,pH,calcining temperature,and calcining time on purity and quality of cerium dioxide were investigated.Results indicated when the ammonia concentration was 6 mol/L,pH =8,setting time was 30 min,calcining temperature was 450 ℃, and calcining time was 2 h, the content of the obtained cerium dioxide was near to actual value of the raw material.