Of rare earth concentrates high temperature chlorination treatment

With chlorine gas at a high temperature of rare earth concentrates into anhydrous chlorides of rare earth elements and impurities associated with the partial separation of rare earth concentrates decomposition method . Temperature chlorination products containing rare earth ( by rare earth oxide ) - 60 % to 65% , the rest of calcium chloride and barium fluoride and other impurities , for electrolysis to take the mixed rare earth materials. High temperature chlorination can handle all types of rare earth concentrates, but mainly for processing Bastnasite concentrate and rare earth oxides containing more than 60% of rare earth concentrate only be appropriate to use this approach .

Rare earth concentrate with added reducing carbon , chlorine in the chlorination furnace fed at 1273 ~ 1473K temperature chlorination . In the chlorination process, the rare earth concentrate with carbon and chlorine and impurities generated most of the role of chloride . Low boiling impurities chloride in gaseous form and CO, CO2 and excess chlorine gas is condensed in the condenser together with recovered , and the high boiling point of earth, calcium , and barium metal chlorides , and fluorides as the melt flow into the receiver , and the resulting anhydrous rare earth chloride . A small amount of radioactive rare earth concentrates generated during the chlorination chloride, most with low boiling chloride gas into the condensate recovery system , a small portion of the melt into a high boiling point . Chlorination is only suitable for processing low- earth concentrate containing radioactive elements .

Of rare earth concentrates high temperature chlorination treatment equipment, small footprint , high efficiency, but not suitable for processing low-grade ore, and chlorinated products are not suitable for use as raw material for production of a single rare earth compounds .

Federal Republic of Germany in the 1960s Goldschmidt (Gold-schmidt, A.G.) company has developed a high temperature chlorination of rare earth concentrates shaft furnace , the first to achieve a high temperature chlorination of rare earth concentrates in industrial production . China from the 1960s began to study high temperature chlorination of rare earth concentrates , completed 70 years of industrial trial production. With the development of science and technology , the processing of rare earth concentrates mostly for the purpose of separating the single rare earth , so the late 1980s industry has not adopted high temperature chlorination process rare earth concentrate .


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