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Mechanism of the Chlorination Roasting of Nickel Sulphide Concentrate with Ammonium Chloride

  • Xiaoyong Mei
  • Hongwei ChengEmail author
  • Cong Xu
  • Guangshi Li
  • Xionggang LuEmail author
  • Qian Xu
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Nickel resources are mainly in the form of sulphides in China, and chlorination roasting is one of the most important means of treating nickel sulphide ore. This paper reports the results of an investigation of the reaction mechanism of ammonium chloride roasting of flotation concentrate. The effect of roasting temperature on the calcine composition is discussed on the basis of roasting products analysis by SEM and vibrational spectra. The role of ammonium chloride in the reaction process was investigated in depth by X-ray micro-area analysis. The results show that the chlorination of ammonium chloride is achieved through the solid–solid chlorination and the chlorine-forming reaction, instead of chlorination by HCl formed by the decomposition of NH4Cl. Metal chlorides and double sulphate salts are formed during the chlorination roasting process, and the formation of double salts benefits the thermal stability of the product.

Keywords

Sulphide Roasting Ammonium chloride Reaction mechanism 

Notes

Acknowledgements

The project was funded by the National Basic Research Program of China (2014CB643403), National Natural Science Foundation of China/Joint Fund for Iron and Steel Research (U1860203) and CAS Interdisciplinary Innovation Team.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Advanced Special Steel & School of Materials Science and EngineeringShanghai UniversityShanghaiChina

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