Thesis
Electrochemical studies on chalcocite-heazlewoodite system
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- Dissolution, rest potential, cyclic voltammetry and contact angle studies have been conducted on the components of INCO matte, chalcocite (Cu4$ sb{2}$S) and heazlewoodite (Ni$ sb{3}$S$ sb{2}$), in water and collector solutions. Dissolution of Ni from heazlewoodite was observed at pH .25 V. A reaction for MBT on chalcocite at $-$0.06 V, not reported previously, was proposed. Contact angle measurements were performed with chalcocite and heazlewoodite in the presence of 2 $ times$ 10$ sp{-3}$ M NaEX over a range of potential and pH values. A significant difference in contact angle between chalcocite and heazlewoodite was observed. There was general agreement between cyclic voltammograms and contact angle measurements: For example, the contact angle on Cu$ sb{2}$S in the presence of NaEX increased significantly at the potential range corresponding to passivation. No bubble contact was observed in the presence of 2 $ times$ 10$ sp{-3}$ M MBT.
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- 2022-03-23
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MM87928.pdf | 2019-09-28 | Public | Download |