Phase transition of bastnaesite concentrate in calcification process
来源期刊：Rare Metals2016年第8期
论文作者：Yu-Kun Huang Ting-An Zhang Zhi-He Dou Jiang Liu Fang-Fang Tang
文章页码：649 - 654
摘 要：The phase transformation in calcification process was investigated by X-ray diffraction（XRD） and differential scanning calorimeter（DSC）, and the effect of calcification on the leaching rate of rare earth was analyzed. The results show that bastnaesite transforms into rare earth hydrate at the calcification temperature range of 225–300 °C. However, this transition is verified to be an efficient reaction for the activating bastnaesite when the temperature is higher than 200 °C. The leaching rate of rare earth increases to 89.17 %for activating bastnaesite from 36.27 % for the bastnaesite,and it is the highest with calcification temperature of 250 °C,which is consistent with the result of DSC analysis. The transition of rare earth oxyfluoride into RE（OH）3 is accelerated by the addition of NaOH according to the experiments of different calcification systems.
Yu-Kun Huang，Ting-An Zhang，Zhi-He Dou，Jiang Liu，Fang-Fang Tang
Key Laboratory of Ecological Metallurgy of Multi-Metal Intergrown Ores of Ministry of Education, School of Materials and Metallurgy, Northeastern University
摘 要：The phase transformation in calcification process was investigated by X-ray diffraction（XRD） and differential scanning calorimeter（DSC）, and the effect of calcification on the leaching rate of rare earth was analyzed. The results show that bastnaesite transforms into rare earth hydrate at the calcification temperature range of 225–300 °C. However, this transition is verified to be an efficient reaction for the activating bastnaesite when the temperature is higher than 200 °C. The leaching rate of rare earth increases to 89.17 %for activating bastnaesite from 36.27 % for the bastnaesite,and it is the highest with calcification temperature of 250 °C,which is consistent with the result of DSC analysis. The transition of rare earth oxyfluoride into RE（OH）3 is accelerated by the addition of NaOH according to the experiments of different calcification systems.
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