supported by the Postdoctoral Research Project of Henan Province (HN2022004);Zhongyuan Critical Metals Laboratory(GJJSGFYQ202319,GJJSGFYQ202328);Open Fund project of Key Laboratory of Ecological Metallurgy of Multi-Metal Intergrown Ores of Ministry of Education(NEMM2022003);Guangxi Science and Technology Major Project (Guike AA22068078);National Key R&D Program of China (2021YFC2902604)。
Preparing rare earth carbonates from rare earth chlorides is a common step in the smelting process for all rare earth ores;however,it produces large amounts of ammoniacal nitrogen wastewater and a chloriderich precipi...