Study on Leaching Process of Activation Bastnaesite by HCl Solution
Bastnaesite was activated at a temperature, and then the rare earths carbonate of the minerals was leached by HCl solution. When activation temperature was 400°C, activation time was 3h, HCl concentration was 3 mol•L-1, leaching temperature was 90°C, liquid to solid was 20:1, the leaching ratio of rare earths carbonate and rare earths fluoride was 94.6% and 0.07% respectively. The results of XRD and SEM showed that bastnaesite was powdered and coarseness in activation process, which made the leaching of rare earths carbonate by HCl solution become easy. The main components of leaching slag were rare earths fluoride, calcium fluoride and barium sulfate.
Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He
X. Bian et al., "Study on Leaching Process of Activation Bastnaesite by HCl Solution", Advanced Materials Research, Vols. 233-235, pp. 1406-1410, 2011