Abstract:Efficient recovery of rare earths from NdFeB waste is a key way to alleviate the shortage of rare earth resources. At present, the most important question in recovering rare earths from NdFeB waste is the deep separation of rare earths and iron.This paper was concerned with iron removing from NdFeB hydrochloric acid leaching solution by hematite precipitation, and the following conclusions were drawn:The dosage of oxidant NaNO3 60?10-3g/g of raw material, HCl 0.663mL/g, the leaching temperature 180°C, the leaching time 3h, the liquid-solid ratio 2.5mL/g, and the stirring speed 300 rpm. The REO and praseodymium-neodymium leaching rate were 95.91% and 97.99%, the acid leaching solution (Fe2O3/REO) 4.37%, and XRD and SEM results showed that the component of the leaching residue was hematite with excellent filtration performance.