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Pyrite-Containing Copper Sulfide Ore

     

According to this method, the ore is ground and leached into a sulfuric acid-containing solution via trivalent copper under atmospheric pressure. When copper sulfide is leached, trivalent iron is reduced to divalent iron, which is oxidized back to the trivalent state by oxygen during the leaching process.

Leaching is performed in a closed reactor, where insoluble gases that rise from the solution and accumulate in the upper section of the reactor are recycled back into the suspension composed of solution, solids, and gases. The leaching is carried out under conditions where divalent and trivalent iron are present, and preferably with dissolved copper (acting as a catalyst to facilitate leaching). The conditions are adjusted such that the pyrite in the ore remains substantially undissolved.

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