1.Jiangxi Ganzhou Technical College, Ganzhou 341000, Jiangxi, China;
2.School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
Abstract：An experiment was conducted on recovery of rare earth from NdFeB waste by a process of roasting-hydrochloric acid leaching. With NdFeB waste as the raw material, effects of roasting temperature and roasting time on the oxidation rate of iron in the NdFeB waste were studied. Then the obtained roasted product was taken as the raw material for recovering rare earth elements therein, and effects of HCl concentration, leaching time and temperature, as well as solid to liquid ratio on the leaching rate of rare earth were also investigated. The results showed that with the optimal roasting condition for NdFeB wastes, including roasting at 700 ℃ for 1.5 h, the oxidation rate of iron could reach 99.30%, and with the optimal conditions for hydrochloric acid leaching of the roasted product, including HCl concentration at 4 mol/L, liquid to solid ratio at 3∶1, leaching at 90 ℃ for 1.5 h, the leaching rate of rare earth were up to 98.11%.
2019, Vol. 39 
