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Effects of Na2SO4 on iron and nickel reduction in a high-iron and low-nickel laterite ore

  • Xiao-ping Wang
  • Ti-chang Sun
  • Chao Chen
  • Jue Kou
Article

Abstract

This study investigates the reactions of Na2SO4 and its effects on iron and nickel reduction in the roasting of a high-iron and low-nickel laterite ore through gas composition, X-ray diffraction, and scanning electron microscope analyses. Results showed that a reduction reaction of Na2SO4 to SO2 was performed with roasting up to 600°C. However, no clear influence on iron and nickel reductions appeared, because only a small amount of Na2SO4 reacted to produce SO2. Na2SO4 reacted completely at 1000°C, mainly producing troilite and nepheline, which remarkably improves selective reduction of nickel. Furthermore, the production of low-melting-point minerals, including troilite and nepheline, accelerated nickel reduction and delayed iron reduction, which is attributed to the concurrent production of magnesium magnetite, whose structure is more stable than the structure of magnetite. Reduction reactions of Na2SO4 resulted in weakening of the reduction atmosphere, and the main product of Na2SO4 changed and delayed the reduction of iron. Eventually, iron metallization was effectively controlled during laterite ore reduction roasting, leading to iron mainly being found in wustite and high iron-containing olivine.

Keywords

laterite ore ferronickel reduction magnetic separation 

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Notes

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 51474018 and 51674018).

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Copyright information

© University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Xiao-ping Wang
    • 1
  • Ti-chang Sun
    • 1
  • Chao Chen
    • 1
  • Jue Kou
    • 1
  1. 1.Key Laboratory of Ministry of Education of China for Efficient Mining and Safety of Metal MinesUniversity of Science and Technology BeijingBeijingChina

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