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2003626 
Journal Article 
Upgrading low nickel content laterite ores using selective reduction followed by magnetic separation 
Zhu, DQ; Cui, Y; Vining, K; Hapugoda, S; Douglas, J; Pan, J; Zheng, GL 
2012 
Yes 
International Journal of Mineral Processing
ISSN: 0301-7516 
106 
1-7 
WOS:000303959700001 
The processing of nickel laterite ore to produce ferronickel is energy intensive, especially when low nickel content ores are processed. The selective reduction-beneficiation of laterite ore to produce high nickel content nickeliferous concentrate and abandon gangue minerals before smelting potentially offers an effective pre-treatment to this process. In this work, the authors conducted selective reduction of nickel laterite ores at 1100 degrees C for 60 min with addition of 6% calcium sulfate and 5% reductant coal. The reduced ore was then wet magnetic separated. The experiments show that high nickel content nickeliferous concentrate containing 6.0%Ni with nickel recovery of 92.1% could be produced with over 75% of the reduced ore, containing low nickel concentration, rejected. The tests indicated that the selectivity of reduction depends mainly on reduction atmosphere and silica level. According to the microscopic study, nickel oxide had been reduced and nickel was mainly enriched into gamma Fe-Ni phase. The presence of sulfur significantly promoted gamma Fe-Ni particle growth, from 5.8 mu m to 16.1 mu m, and improved the Ni enrichment in metallic phases. (C) 2012 Elsevier B.V. All rights reserved. 
Low nickel content laterite ore; Selective reduction; Sulfur containing additive; High nickel concentrate