The limonitic laterite ore containing 1.17% Ni and 35.71% Fe by the coal-based reduction?magnetic separation process was studied using sodium sulfate as additive. The results showed that nickel was mainly associated with oxides (27.40%) and silicates (69.35%) in ore. For a ferronickel content of 13.26% Ni and 67.34% Fe, nickel recovery rate of 88.40%, iron recovery rate of 14.71% could be obtained under the best conditions of reduction temperature 1100℃, reduction time 60 min, the mass fraction of additive 20% and reductant 8% by the application of a 200 mT magnetic field, the enrichment ratio of nickel reached 11.33. Addition of sodium sulfate destroys the silicate mineral structure, and the majority of nickel and iron is liberated from silicates, FeS could also be generated. The formation of FeS inhibits the reduction of iron, decreases the system melting point, intensifies the process of metal irons mass transfer and enhances ferronickel particles growth during the reduction of laterite.
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