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The leaching and electrochemistry of gold, silver and gold–silver alloys in cyanide solutions has been investigated using air, oxygen and/or hydrogen peroxide as oxidant in the presence or absence of lead(II) ions. It has been found that both the gold–silver oxidation half reaction and the oxygen reduction half reaction occur more readily with increasing silver content in the alloy, and both half...
The effect of galvanic interactions and sulfide mineral dissolution on the gold leaching kinetics in aerated cyanide solutions is investigated. Gold leaching kinetics were measured using a rotating electrochemical quartz crystal microbalance (REQCM), which measures the leaching rates in-situ. When the mineral is electrically in contact with gold, the gold dissolution rate increases as a result of...
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