Razi, P., Ahmadi, R. (2017). Beneficiation of Low-Grade Laterite Nickel by Calcination-Magnetic Separation Method. Iranian Journal of Chemistry and Chemical Engineering (IJCCE), (), -.
Parvane - Razi; Rahman - Ahmadi. "Beneficiation of Low-Grade Laterite Nickel by Calcination-Magnetic Separation Method". Iranian Journal of Chemistry and Chemical Engineering (IJCCE), , , 2017, -.
Razi, P., Ahmadi, R. (2017). 'Beneficiation of Low-Grade Laterite Nickel by Calcination-Magnetic Separation Method', Iranian Journal of Chemistry and Chemical Engineering (IJCCE), (), pp. -.
Razi, P., Ahmadi, R. Beneficiation of Low-Grade Laterite Nickel by Calcination-Magnetic Separation Method. Iranian Journal of Chemistry and Chemical Engineering (IJCCE), 2017; (): -.
Beneficiation of Low-Grade Laterite Nickel by Calcination-Magnetic Separation Method
Articles in Press, Accepted Manuscript , Available Online from 01 November 2017
1Department of Mine Engineering, Imam Khomeini International University (IKIU), Qazvin, Iran
2Imam Khomeini International University,Qazvin, Iran
Abstract
In this paper, Effect of thermal treatment on beneficiation of low-grade laterite nickel by calcination-magneticseparationmethod was studied. In order to determine the components and elements of sample, to recognize the main and minor minerals and their bond, and phase transformation caused by thermal treatment, Chemical analysis (XRF and ICP), microscopic studies and XRD analysis were done, respectively.SEM analysis was done to study the content of nickel and otherminerals. In order to determine the phase transformation of sample because of calcination treatment, thermal analysis of DTA/TG and XRD analysis, before and after of calcination were done. Wet magnetic separation tests with two methods of calcination-magnetic separation and only magnetic separation were done on the sample and the results in grade and recovery ofnickel concentrate were compared. According to results, nickel content in the sample was0.94%. Main minerals of laterite sample were Hematite, Goethite, Quartz and dolomite and minor minerals were Magnetite and minerals of serpentine group. Furthermore, there is no independent nickelmineral in the sample. SEM studies declared that nickel was substituted in iron containing minerals (Hematite and Goethite). XRD and thermal analysis (DTA/TG) showed that at 350 °C, Goethite transformed to Hematite and at 750 °C, Hematite transformed widelyto Magnetite. Calcination of feed at 750°C followed by wet magnetic separation with magnetic field of 6000 Gauss in comparison with alone magnetic separation caused increase in recovery and grade of magnetic concentrate to 12.7% and 0.41%, respectively. Results showed that increase in temperature more than 750 °C, caused decrease in recovery and grade of nickel in magnetic concentrate.
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