Clean separating method of Baotou rare-earth ore concentrate

[0054] The mixed rare earth concentrate (50% REO) was roasted with sodium carbonate, washed with water and pickled with 0.5 mol / L dilute hydrochloric acid, and then pickled with 5 mol / L nitric acid to obtain Ce-containing 4+ 、Th 4+ and the leaching solution of trivalent rare earth elements, using P503 extractant to extract Ce 4+ Th 4+ extraction, followed by separation of light rare earths.

[0055] Extraction of Ce with P503 Extractant 4+ The method is: use alkane solution with a volume ratio of 20~40%P503 as the extraction agent, after 5-8 stages of extraction, 7-10 stages of washing, 3~5 stages of countercurrent back extraction, the pH of the cerium stripping solution is adjusted to 1~2, add oxalic acid to precipitate cerium, wash the precipitate, and roast at 800~850°C for 0.5-2 hours to obtain CeO 2 Product, the purity is as high as 99.9%, ThO 2 / CeO 2 -4 .

[0056] Th extraction with P503 extractant 4+ The method is: use alkane solution with a volume ratio of 20-...

[0059] In Example 2, the mixed rare earth concentrate REO is 60%, and 0.5 mol / liter of dilute nitric acid is used for pickling, and the rest are the same as in Example 1.

[0061] In Example 3, the REO content of the mixed rare earth concentrate is 55%, and the mixed acid of 0.5 mol / L dilute sulfuric acid and dilute hydrochloric acid is used for pickling, and the rest are the same as in Example 1.