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Effect of SiO2/MgO Mass Ratio on Direct Reduction-Magnetic Separation Process of Low-Grade Lateritic Nickel Ore AITranslate

GONG Jia-chen; ZHAO Jing-fu; PAN Jian; ZHENG Bin; LIU Yan; JIANG Chao; LI Wei; LI Qian-wen; PAN Yan-cen; LIU Dong-mei
School of Minerals Processing and Bioengineering,Central South University;School of Minerals Processing and Bioengineering,Central South University;School of Minerals Processing and Bioengineering,Central South University;School of Minerals Processing and Bioengineering,Central South University;School of Minerals Processing and Bioengineering,Central South University;School of Minerals Processing and Bioengineering,Central South University;School of Minerals Processing and Bioengineering,Central South University;School of Minerals Processing and Bioengineering,Central South University;School of Minerals Processing and Bioengineering,Central South University;School of Minerals Processing and Bioengineering,Central South University
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Publisher: Editorial Office of Rare Metals and Cemented Carbides
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Abstract AITranslate

The SiO2/MgO mass ratio significantly influences the microstructure,mineral composition,and reduction roasting product properties of low-grade lateritic nickel ore,thereby playing a crucial role in selecting and optimizing the process parameters for direct reduction-magnetic separation of the ore.This study investigated the influence of the SiO2/MgO mass ratio on the product indicators of direct reductionmagnetic separation for low-grade lateritic nickel ore,explored the relationship between the SiO2/MgO mass ratio and the optimal magnetic field strength for magnetic separation,and optimized process conditions,including slagging agent ratio,roasting temperature,and roasting time.The results indicate that the SiO2/MgO mass ratio significantly affects the indicators of magnetic separation concentrate products.A lower SiO2/MgO mass ratio fails to create favorable conditions for the reduction of valuable metals Ni and Fe.As the SiO2/MgO mass ratio increases,the optimum magnetic field strength for magnetic separation gradually rises.The optimal SiO2/MgO mass ratio,slagging agent ratio,roasting temperature,and roasting time are 2.81,5%,1350℃,and 2 h,respectively.Under these optimal conditions with a reducing agent ratio of 25%,ore particle size of-3 mm,grinding fineness of 80%passing-0.075 mm,and magnetic field strength of 2000 Oe,the magnetic separation concentrate product yields a Ni grade of 4.87%,Ni recovery rate of 90.34%,Fe grade of 85.95%,Fe recovery rate of 88.21%,Co grade of 0.29%,and Co recovery rate of 94.25%.

KeyWords AITranslate

lateritic nickel ore SiO2/MgO mass ratio direct reduction magnetic separation slagging agent roasting temperature roasting time recovery rate
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DOI：

Chinese Library Classification Number:TF815[冶金工程—有色金属冶金]

Citation Information:

The SiO2/MgO mass ratio significantly influences the microstructure,mineral composition,and reduction roasting product properties of low-grade lateritic nickel ore,thereby playing a crucial role in selecting and optimizing the process parameters for direct reduction-magnetic separation of the ore.This study investigated the influence of the SiO2/MgO mass ratio on the product indicators of direct reductionmagnetic separation for low-grade lateritic nickel ore,explored the relationship between the SiO2/MgO mass ratio and the optimal magnetic field strength for magnetic separation,and optimized process conditions,including slagging agent ratio,roasting temperature,and roasting time.The results indicate that the SiO2/MgO mass ratio significantly affects the indicators of magnetic separation concentrate products.A lower SiO2/MgO mass ratio fails to create favorable conditions for the reduction of valuable metals Ni and Fe.As the SiO2/MgO mass ratio increases,the optimum magnetic field strength for magnetic separation gradually rises.The optimal SiO2/MgO mass ratio,slagging agent ratio,roasting temperature,and roasting time are 2.81,5%,1350℃,and 2 h,respectively.Under these optimal conditions with a reducing agent ratio of 25%,ore particle size of-3 mm,grinding fineness of 80%passing-0.075 mm,and magnetic field strength of 2000 Oe,the magnetic separation concentrate product yields a Ni grade of 4.87%,Ni recovery rate of 90.34%,Fe grade of 85.95%,Fe recovery rate of 88.21%,Co grade of 0.29%,and Co recovery rate of 94.25%.

quote

GB/T 7714-2015 [1] GONG Jia-chen, ZHAO Jing-fu, PAN Jian, et al. Effect of SiO2/MgO Mass Ratio on Direct Reduction-Magnetic Separation Process of Low-Grade Lateritic Nickel Ore[J]. Rare Metals and Cemented Carbides, 2025(5): 28-36.
MLA [1] GONG Jia-chen, et al., "Effect of SiO2/MgO Mass Ratio on Direct Reduction-Magnetic Separation Process of Low-Grade Lateritic Nickel Ore." Rare Metals and Cemented Carbides, no. 5, 2025, pp. 28-36.
APA [1] GONG Jia-chen, ZHAO Jing-fu, PAN Jian, ZHENG Bin, LIU Yan, JIANG Chao, LI Wei, LI Qian-wen, PAN Yan-cen, & LIU Dong-mei. (2025). Effect of SiO2/MgO Mass Ratio on Direct Reduction-Magnetic Separation Process of Low-Grade Lateritic Nickel Ore. Rare Metals and Cemented Carbides(5), 28-36.
IEEE [1] GONG Jia-chen, ZHAO Jing-fu, PAN Jian, ZHENG Bin, LIU Yan, JIANG Chao, LI Wei, LI Qian-wen, PAN Yan-cen, and LIU Dong-mei, "Effect of SiO2/MgO Mass Ratio on Direct Reduction-Magnetic Separation Process of Low-Grade Lateritic Nickel Ore," Rare Metals and Cemented Carbides, no. 5, pp. 28-36, 2025. keywords: {lateritic nickel ore;SiO/MgO mass ratio;direct reduction;magnetic separation;slagging agent;roasting temperature;roasting time;recovery rate}