Limitations of conventional sulphidisation in restoring the floatability of oxidised chalcocite was written by Moimane, Tiisetso;Peng, Yongjun. And the article was included in Minerals Engineering in 2022.Recommanded Product: Cuprichydroxide This article mentions the following:
The secondary copper sulfide mineral, chalcocite, is the second most important copper mineral and its flotation is significantly affected by the surface oxidation There is scarcity of reports on sulphidisation of oxidised chalcocite and literature suggests that the conventional sulphidisation experiences difficulties in activating sulfides that are prone to oxidation Thus the objective of this study was to understand the sulphidisation of chalcocite, the copper sulfide most prone to surface oxidation To achieve this, surface anal. by Cryogenic XPS, Cyclic Voltammetry measurements and flotation tests were adopted. It was found that the lower flotation recovery of the oxidised chalcocite after sulphidisation at 0.10 V vs. standard hydrogen electrode was attributed to partial sulphidisation, 36.2%, of the Cu(II) oxidation species to form the desired Cu(I)-S product, while 62.8% of the species remained unsulphidised. It was revealed that all the Cu(II) oxidation species on chalcocite were sulphidised to the desired Cu(I)-S product at the lower potential of -0.20 V. Intriguingly, the flotation recovery was even lower than that obtained at 0.10 V. The limited improvement in flotation even though the surface was fully sulphidised was attributed to the high electrochem. activity and re-oxidation of the Cu(I)-S product formed. In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Recommanded Product: Cuprichydroxide).
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Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”