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Research on Leaching of Calcification Transition Slag of Bastnaesite

The newtechnology of bastnaesite in calcification transition decomposition-acid leaching to extract rare earth was proposed. The pressurized DSC was used to investigate the kinetics of calcification transition slag in acid leaching. The leaching effects of leaching temperature,acid concentration,leaching time,liquid to solid ratio were studied. The results showed that the acid leaching reaction of calcification transition slag can take place at room temperature of 30 ℃,and the apparent activation energy and reaction order are 0. 014 k J / mol and0. 11,respectively. The appropriate strengthening acid leaching conditions are the leaching temperature of 80 ℃,the concentration of hydrochloric acid of 1 mol·L- 1,the leaching time of30 min and the liquid-solid ratio of 15∶ 1.