稀土冶炼副产品铈富集物的提纯工艺研究

Research on the Refinement Technology of Cerium Rich Concentrate from By-product Of Rare Earth Smelting

四川冕宁稀土矿生产工艺采用两步盐酸优溶法生产少铈富镧混合氯化稀土,产生大量的铈富集物产品。这种粗铈产品提纯困难,价格低廉,用途单一,只能用来生产稀土硅铁合金。采用硫酸溶解铈富集物,溶解完全后加入还原剂——硫脲,四价铈还原成三价铈,使混合稀土全部为三价稀土。用Mg O中和除渣后用P204-煤油萃取全捞稀土,盐酸反萃取,提取出混合氯化稀土。

Rare earth mine in Sichuan Mianning county produce less cerium-rich lanthanum mixed rare earth chloride by two-stepHydrochloric Acid Solution. The production process produces a large amount of cerium rich concentrate. Cerium rich concentrate only be used to produce rare earth ferrosilicon alloy on account of refinement difficult, low price, single purpose.Cerium rich concentrate was dissolved in sulfuric acid, adding reducing agent CS（NH_2）_2 after complete dissolution, Ce^（4＋）reduce Ce^（3＋）. Neutralization with MgO, extraction in P204- kerosene, reverse extraction with HCl, output mixed rare earth chloride.