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Russian Journal of Non-Ferrous Metals

, Volume 59, Issue 6, pp 596–604 | Cite as

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

  • Jie Li
  • Yandong Li
  • Huamei DuanEmail author
  • Xueyi Guo
  • Yuchun ZhaiEmail author
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.

Keywords:

laterite-nickel ore ammonium sulfate roasting process leaching process kinetic equation 

Notes

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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Copyright information

© Allerton Press, Inc. 2018

Authors and Affiliations

  1. 1.School of Metallurgy, Northeastern UniversityShenyangChina
  2. 2.Chongqing Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology, Yangtze Normal UniversityChongqingChina
  3. 3.College of Materials Science and Engineering, Chongqing UniversityChongqingChina
  4. 4.School of Metallurgy and Environment, Central South UniversityChangshaChina
  5. 5.College of Resources and Materials, Northeastern University at QinhuangdaoQinhuangdaoChina

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