The effect of ore type, depth, and leach time on cyanide species in column tests using NaCN leach solutions
AuthorSheridan, Jon P
AdvisorHendrix, James L.
Mining & Metallurgical Engineering
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Three ores (sulfidic, oxidized and carbonaceous) were analyzed to determine the effects of leaching time, ore depth, and ore mineralogy on cyanide species concentration. NaCN solutions were percolated through opaque columns filled with milled ore. Column design made liquid sample collection possible from various depths at specific times. The concentrations of free and total cyanide, Fe(CN)g , Fe(CN)g4-, SCN", and Cu(CN)43" were determined for each sample. Extended percolation time led to increases in free cyanide concentrations and decreased SCN and Cu(CN)4 concentrations regardless of ore depth. Free cyanide concentration decreased while Fe(CN)g4" concentration increased with ore depth. Highest concentrations of Fe(CN)g4", O SCN", and Cu(CN)4 were found in the sulfidic ore, with expected low free cyanide concentrations. Lowest concentrations of Fe(CN)g4 , SCN", and Cu(CN)4 were found in the oxidized ore. Intermediate concentrations of these cyanide species were found in the carbonaceous ore.
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