Leaching of commercial nickel matte with chlorine (I). Mineralogy and reaction mechanism

摘要

Leaching of commercial nickel matte in acidic medium with chlorine has been studied experimentally in the temperature range 75.5-97.5 deg C and in the potential range 300-520 mV(SCE). The results of X-ray diffraction analysis of the leaching samples showed that the electrochemical dissolving process of Ni3S2 may be expressed as Ni_3S_2 - > Ni_(3-x) - > S_2 - > beta-NiS - > Ni_3S _4 - > Ni~(2+) Although SO_4~(2-) ions are formed in leaching, almost all of S~(2-) in raw material are oxidized to element sulfur. Copper in the sample is found to be Cu_2S. The above results are discussed in present paper.