Mechanism of the Chlorination Roasting of Nickel Sulphide Concentrate with Ammonium Chloride
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.
KeywordsSulphide Roasting Ammonium chloride Reaction mechanism
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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