(江西省稀土研究所,南昌330013)
摘 要: 报道了萃取分离中国南部离子吸附型稀土矿的一种新工艺,第一步进行La-Gd/(Gd)TbDy(HoY)/Ho-LuY萃取分组,出口水相La-Gd再进行Nd/Sm分组;中间出口的(Gd)TbDy(HoY)组份进行Tb/Dy分离。 在各系列的萃取段前设附加段来提高稀土浓度和回收率。该工艺流程衔接容易,昂贵的P507 萃取剂使用量减少,处理能力增加,贵重Tb,Dy在流程前部富集直收率提高,制取高纯Tb,Dy成本降低。适用于高钇矿经提钇后的低钇混合稀土矿、 钇富铕矿、低钇离子稀土矿的萃取分离。
关键字: 萃取分离;低钇混合稀土
(Jiangxi Research Institute of Rare Earth, Nanchang 330013, P. R.China)
Abstract:A new extractional process which separates the ion-absorptive rare earth minerals in south China was reported. In the process, the first step is the separation of La-Gd and (Gd)TbDy(HoY) and Ho-LuY using HEH(EH)P, which is different from usual Nd/Sm method. Next, the raffinate obtained from the first step containing La-Gd rare earths is used as raw feed of Nd/Sm process with D2EHPA or HEH(EH)P. The (Gd)TbDy(HoY) concentrate obtained from the first step is directly fed to Tb/Dy process. This process is suitable for low yttrium mischmetal, middle yttrium mineral and low yttrium mineral in South China.
Key words: extractional separation; mischmetal