稀土湿法浸出铅钡渣中回收稀土及氯化铅的研究OA

This study focuses on the lead-containing precipitate slag produced during the hydrometallurgical leaching of bastnaesite,where lead ions are precipitated using Na2S.The rare earth grade of this slag ranges from 14%to 35%.The process first involves oxidizing the lead-barium slag with nitric acid to obtain a corresponding nitrate solution.Subsequently,30%concentrated hydrochloric acid is added to this solution at low temperatures to induce the crystallization of lead chloride,yielding a mixture of nitric acid and a rare earth nitrate solution.After filtration and washing,solid lead chloride crystals are obtained,and the nitric acid in the filtrate is recycled for dissolving fresh lead-barium slag.This method achieves a lead recovery rate of over 96.5%and a rare earth recovery rate of over 97%.