Extraction of Ferronickel Concentrate by Reduction Roasting-Magnetic Separation from Low Grade Laterite Nickel Ore under the Action of Compound Additives

Nickel is an important strategic metal in the world. As sulfide ore containing high-grade nickel increasingly depleted, laterite ore, which rich resources, has attracted people’s attention. In this paper, reduction roasting-magnetic separation process used to study method of preparing ferronickel concentrates from low-grade under action composite additives (Na2CO3 and CaF2). The research results showed that when ratio Na2CO3 CaF2 was 1:7, temperature 1250°C, time 60 min, magnetic field strength 150 mT, wet grinding 12 grade recovery extent were 8.39 wt.% 98.54%, iron 67.70 71.73%.