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| LOW-TEMPERATURE REDUCTION OF GARNIERITE USING METHANE FOLLOWED BY ROASTING-MAGNETIC SEPARATION FOR ENRICHMENT OF FERRONICKEL CONCENTRATE |
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Received:April 10, 2017
Revised:April 14, 2017
Accepted:April 18, 2017
Published Online:March 01, 2018
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| DOI： |
| KeyWord:garnierite; methane; low-temperature reduction; magnetic separation |
| Author | Institution |
| DING Zhi-guang |
Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology |
| LI Bo |
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming University of Science and Technology |
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| Abstract: |
| In this study, the garnierite from Yuanjiang, Yunnan province was reduced by methane under different conditions followed by magnetic separation to obtain the ferronickel concentrate. The experimental results show that the reduction temperature in the range of 600°C to 900°C had no noticeable effect on the contents and recoveries of nickel and iron. The contents and recoveries of nickel and iron in the concentrates increased slightly with prolonging of the reduction time. In addition, the contents of nickel and iron decreased with increasing methane concentration, whereas the recoveries of nickel and iron increased. Decreases in the iron content and recovery were observed when the dosage of sodium sulfate varied from 5% to 20% under a reducing temperature of 800°C and a reducing time of 90 minutes, whereas the nickel content and recovery were gradually increased. The phase and microstructure transformation of garnierite in the reduction process were investigated using X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), and Energy Dispersive Spectrometer (EDS). The results show that the nickel and iron oxides were the main phase in concentrate, and the content of iron was much higher than that of nickel. |
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