| 摘要 |
PURPOSE:To easily carry out industrial treatment of rare earth concentrate powder by adding solid alkali to rare earth concentrate fines and subjecting the mixture to decomposition by heating at a specific temp. CONSTITUTION:A proper amount of solid alkali is added to the rare earth concentrate fines containing monazite, xenotime, or bastnaesite, or >=2 kinds among the above. Further, industrially, caustic soda is efficient and economical as the solid alkali. Subsequently, the rare earth concentrate fines is irradiated with microwaves having frequency of 300MHz-300GHz and is heated to >=500 deg.C, preferably about 700-900 deg.C, for about >=10min. The obtained reaction product is subjected to chemical treatment such as washing, acid leaclaing, etc., in the following stage and refined into an intermediate.
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