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Leaching Sulfides by Sulphuric Acid: Copper

Mr. C. A. Stetefeldt introduced at the Marsac mill, Park City, Utah, an unpatented process, built up out of the general fund of information available. It consisted in matting the sulphides, grinding, roasting, grinding again, and dissolving the copper out in diluted sulphuric acid, then melting the silver and crystallizing the bluestone.

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Therefore, in order to understand the nature of the thiosulfate–nitrite–sulfite–copper system, the effect of each reactant and their concentration was evaluated at different pH in the silver leaching. Silver leaching with the thiosulfate–copper, sulfite–copper and nitrite–copper systems at different

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those of the other three cyanide destruction process routes considered. predominantly use sodium metabisulfite (SMBS, or SO2) with air, Caro's acid such as sodium metabisulfite (Na2S2O5) or sodium sulfite (Na2SO3), along with copper (II) sulfate . Adams, The Chemistry of Cyanide in the Extraction of Gold.

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We used 500 grams of commercial grade sodium cyanide and liters of hydrogen peroxide of 36%. This solution contains 100 grams of gold around 5 grams of iron and 5 grams of solder. We want to use copper sulphate, sodium metabisulfite for cyanide and hydrogen peroxide destruction. And sodium hydro sulfite for gold recovery from the solution.

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pretreatment of refractory ores prior to gold leaching

A process for leaching gold values from goldcontaining ores comprising treating the ore with a gold oxidant to oxidize metallic gold, treating said ore with a gold complexing agent and leaching said ore with a sulfurous acid leaching agent to form a goldsulfite complex

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