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Experimental Investigation Of The Thermochemical Reduction Of Arsenite And Sulfate: Low Temperature Hydrothermal Copper, Nickel, And Cobalt Arsenide And Sulfide Ore Formation, Nicholas Allin

Graduate Theses & Non-Theses

Experiments were conducted to determine the relative rates of reduction of aqueous sulfate and aqueous arsenite (As(OH)₃,aq) using foils of copper, nickel, or cobalt as the reductant, at temperatures of 150ºC to 300ºC. At the highest temperature of 300°C, very limited sulfate reduction was observed with cobalt foil, but sulfate was reduced to sulfide by copper foil (precipitation of Cu₂S (chalcocite)) and partly reduced by nickel foil (precipitation of NiS₂ (vaesite) + NiSO₄·xH₂O). In the 300ºC arsenite reduction experiments, Cu₃As (domeykite), Ni₅As₂, or CoAs (langisite) …