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Experimental and Kinetic Study of Magnesium Extraction and Leaching from Laterite Nickel Ore by Roasting with Ammonium Sulfate

  • METALLURGY OF NONFERROUS METALS
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Abstract

Laterite-nickel ore was roasted with ammonium sulfate to extract magnesium by a single-factor experiment, and an orthogonal test was employed to optimize the conditions. The optimum roasting conditions were: calcination temperature, 450°C; calcination time, 120 min; molar ratio of reactants, 2 : 1; granularity <80 µm. The kinetics of the roasting process were also studied. The experimental results showed that the extraction rate of magnesium increased as the calcination temperature increased. The reaction rate of magnesium is in accordance with the shrinking non-reacted nuclear model for the solid product formation reaction. The roasting reaction is controlled by internal diffusion. The apparent activation energy is E = 18.96 kJ mol–1. The kinetic equation is \({\text{1}} + {\text{2}}\left( {{\text{1}} - {\alpha\text{}}} \right) - {\text{3}}{{\left( {{\text{1}} - {\alpha\text{}}} \right)}^{{{{\text{2}} \mathord{\left/ {\vphantom {{\text{2}} {\text{3}}}} \right. \kern-0em} {\text{3}}}}}} = {\text{0}}{\text{.05061exp}}\left[ { - {{{\text{18}}{\text{963}}} \mathord{\left/ {\vphantom {{{\text{18}}{\text{963}}} {\left( {RT} \right)}}} \right. \kern-0em} {\left( {RT} \right)}}} \right]t.\) A single factor experiment and orthogonal test were carried out to optimize the magnesium leaching process reaction conditions. The optimum conditions of the leaching process were: leaching temperature, 60°C; leaching time, 60 min; liquid to solid ratio, 2.5 : 1; stirring intensity, 400 r min–1. The kinetic equation is 1 – (1 – α)2/3 = 0.3991exp(–8632/RT)t. The apparent activation energy is E = 8.63 kJ mol–1. The reaction rate of the leaching process was controlled by external diffusion.

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ACKNOWLEDGMENTS

The authors are grateful for the financial support provided by the National Basic Research Program of China, project no. 2014CB643405.

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, 110819, Shenyang, China

    Jie Li & Yuchun Zhai

  2. Chongqing Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology, Yangtze Normal University, 408000, Chongqing, China

    Yandong Li

  3. College of Materials Science and Engineering, Chongqing University, 400044, Chongqing, China

    Huamei Duan

  4. School of Metallurgy and Environment, Central South University, 410083, Changsha, China

    Xueyi Guo

  5. College of Resources and Materials, Northeastern University at Qinhuangdao, 066004, Qinhuangdao, China

    Yuchun Zhai

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  1. Jie Li
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Correspondence to Huamei Duan or Yuchun Zhai.

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Jie Li, Li, Y., Duan, H. et al. Experimental and Kinetic Study of Magnesium Extraction and Leaching from Laterite Nickel Ore by Roasting with Ammonium Sulfate. Russ. J. Non-ferrous Metals 59, 596–604 (2018). https://doi.org/10.3103/S1067821218060123

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