针对现阶段钕铁硼废料中稀土难于经济有效提取的现状，开展了钕铁硼废料硫酸化焙烧选择性分离稀土的研究。结果表明，Fe2(SO4)3亦可使稀土氧化物发生硫酸盐转型，这使硫酸用量显著减少，在硫酸用量为理论量的2.0倍、焙烧温度750℃、焙烧时间1.5 h条件下，近98%的稀土氧化物在H2SO4, Fe2(SO4)3的共同作用下转化为易分离的硫酸稀土，而铁的浸出率小于0.1%，主要以易于冶炼的赤铁矿(Fe2O3)物相存在于渣中，该工艺实现了硫酸的减量化与钕铁硼废料的综合利用。

Considering the current status associated with the difficult extraction of rare earths in NdFeB magnet scraps in terms of economy and efficiency, rare earths were selectively separated from NdFeB magnet scraps by sulfating roasting. Fe2(SO4)3 was found to induce the sulfate transformation of rare-earth oxides, significantly reducing the amount of sulfuric acid. Almost 98% of rare earth oxides were transformed to soluble rare earth sulfate by the combined action of H2SO4 and Fe2(SO4)3 under conditions of a theoretical amount of sulfuric acid of 2.0 times, a roasting temperature of 750℃, and a roasting time of 1.5 h, while less than 0.1% of iron was leached, mainly existing in the form of a residue as a hematite (Fe2O3) phase; this hematite phase can be easily smelted in iron works. As a result, the reduction of sulfuric acid and the comprehensive utilization of NdFeB magnet scraps are achieved.