稀土学报（英文版）
稀土學報（英文版）
희토학보（영문판）
JOURNAL OF RARE EARTHS
2014年
11期
1043-1047
,共5页
黄宇坤%张廷安%豆志河%刘江%唐方方
黃宇坤%張廷安%豆誌河%劉江%唐方方
황우곤%장정안%두지하%류강%당방방
bastnaesite%calcification transformation%acid leaching%leaching ratio%rare earths
Extracting rare earths from bastnaesite concentrate treated by calcification transition was studied through the single factor test and XRD patterns of bastnaesite after calcification and slags after leaching in HCl solution. And the effects of the main calcified parameters such as temperature, liquid/solid and calcified time on transition performance of bastnaesite were investigated. It was found that under the optimal conditions of calcification temperature of 250 oC, liquid/solid of 20 mL/g, calcification time of 180 min, the highest leaching rate of rare earth were obtained, with the leaching ratio of rare earths 83.70%and Ce 77.01%, La 90.55%, Nd 92.03%, respectively;loss rates of fluorine with different calcification conditions were always less than 1%and XRD patterns of cal-cification slags and leaching slags showed that fluorine existed in the form of CaF2.
