A method for recovering phosphorus and rare earth from rare earth containing phosphorite

摘要

#$%^&*AU2016200606A120160901.pdf#####Abstract The present disclosure discloses a method for recovering phosphorus and rare earth from rare earth containing phosphorite. The method includes the following steps: leaching a rare earth containing phosphorite by using a mixed acid solution, and filtering and obtaining a mono-calcium phosphate solution and a rare earth phosphate containing slag, the main component of the mixed acid solution is a phosphoric acid and the mixed acid solution further comprises a hydrochloric acid and/or a nitric acid; recovering the phosphorus of the mono-calcium phosphate solution, and recovering the rare earth of the rare earth phosphate containing slag. The method leaches the rare earth containing phosphorite by using the mixed acid solution so that the phosphorus in the phosphorite forms the higher soluble mono-calcium phosphate, at the same time by regulating and controlling the acidity in the leaching process to precipitate and enrich the rare earth in the form of a rare earth phosphate in the slag, if the rare earth containing phosphorite further contains a monazite, the monazite and the rare earth phosphate are enriched in the slag, thereby separating the phosphorus and the rare earth, simplifying recovery steps, improving the recovery rate of the rare earth, and achieving the purpose of comprehensive recovery of the rare earth with low cost. 37Rare earth containing phos horite Phosphoric acid solution+hydroc Leaching ---------------------------hioric acid/nitric acid Filtration Rare eart hosphate Monocalcium Iron-containing contain sla hosphate solution compound .l | Magnesium/calcium- S r 7 acid containing compound Enhanced bake Filtration Concentrated sulfuric acid Water leaching Phosphorus Gypsum containing Carbonate/oxalate solution L rare earth Solvent precipitation extraction Impurities removal rare earth rare earth chloride carbonate/ oxalate Phosphorus product Fig. 1 38