|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Rare Metal Extraction & Processing
||Study of the Mechanochemical Calcification for Mixed Rare Earth Concentrate
||Jiang Liu, Zhang Ting'an, Zhihe Dou, Yukun Huang
|On-Site Speaker (Planned)
The paper aimed to propose that mixed rare earth concentrate was decomposed by pressurized calcification where mechanical milling was applied simultaneously (also known as mechanochemical calcification). The bastnaesite and monazite were both decomposed by OH-, where released rare earth formed RE(OH)3, released fluorine and phosphorus formed CaF2 and Ca2P2O7. Then, the calcified slag was leached by diluted hydrochloric acid to extract rare earth and both recover fluorine and phosphorus. The phase transformation regularity, the behavioral trends of rare earth, fluorine and phosphorus were investigated. Results showed under the optimal conditions of ball to material weight 80:1, the calcification temperature 250℃, the liquid-solid ratio 5:1, the leaching rate of rare earth was reached to 92.16%.