Reduction Roasting Test of Garnierite Laterite Ore by Methane
Journal Title: 河南科技大学学报（自然科学版） - Year 2018, Vol 39, Issue 3
Abstract
A low-grade garnierite laterite ore composed of 0. 82% Ni and 9. 67% Fe was studied through roasting-magnetic process under the condition of methane atmosphere. The methane was proved to be decomposed to carbon and hydrogen by gas chromatograph. Thermodynamic calculations show that nickel oxides is reduced to metallic nickel by H2, C, CO at 873 K to 1 173 K. Iron oxides is reduced to metallic iron by C and CO, but iron oxide is reduced to ferrous oxide by H2. MgSiO3 is more likely to react with sodium sulfat than Mg2SiO4. The effects of reduction temperature, reduction time and additive dosage on the laterite ore in the reduction roasting process were studied. In comprehensive consideration of the grade and recoveries of nickel and iron, the optimum conditions for reduction process are that reduction temperature is 800 ℃, reduction time is 90 min, the mass fraction of additive sodium sulfate is 20%.
Authors and Affiliations
Haipei ZHANG, Hongyin LIU, Zhiguang DING
Keywords
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