摘要
四川冕宁含稀土原矿经Na2 CO3脱氟后 ,采用氯化铵焙烧法提取稀土。通过正交试验确定了脱氟最佳条件 :温度650℃ ,脱氟剂用量m(Na2 CO3) /m(原矿 ) =0 .2 5,反应时间 30min ,原矿脱氟率达到 95%以上。同时考察了温度、时间及NH4Cl对脱氟原矿稀土氯化的影响 ,在优化条件下氯化 ,其稀土回收率达到 95%以上。浸出液的成分分析结果表明 ,氯化过程中Fe ,Si和Al的溶出量很少 ,有利于该浸出液中稀土的提取与分离。
The optimum conditions of stripping fluorine for Sichuan bastnasite crude ore were determined by orthogonal experiments. Over 95% fluorine in the crude ore was stripped by roasting 30 min of the crude ore with m (Na 2CO 3)/ m (ore)=0.25 at 650 ℃. The stripped fluorine crude ore was further treated by NH 4Cl to recover RE. Above 95% RE can be leached by water after the stripped fluorine crude ore mixed with NH 4Cl ( m (NH 4Cl)/ m (ore)=1∶1) was roasted 1 h at 325 ℃. At the same time, the RE leaching solution contains little Fe, Si and Al. Therefore it is propitious to further purify the solution and recover RE. [
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2000年第5期701-704,共4页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金!资助项目 ( 5980 4 0 0 4
59674 0 2 2 1 )
国家杰出青年科学基金!资助项目 ( 5972 540 8)
