Copper leaching process employing nitrogen dioxide

Details Copper leaching process employing nitrogen dioxide Copper leaching process employing nitrogen dioxide

C - Chemistry, Metallurgy

22

B

53/284

C22B 15/00 (2006.01) C22B 3/06 (2006.01)

Patent

CA 1110077

K-0508-KCC Abstract of the Disclosure Sulfidic minerals containing metal values such as copper, silver, nickel, cobalt, molybdenum, zinc, iron, or mixtures thereof are oxidized with nitrogen dioxide to enable the metal values to be solubilized in an aqueous acidic leach liquor. In practicing the inven- tion, the minerals are added to an aqueous acidic leach liquor and a nitrogen dioxide containing gas is sparged through the slurry to oxidize the metal values. During the reaction, the nitrogen dioxide is reduced to nitric oxide. The nitric oxide is oxidized to nitrogen dioxide by oxygen, either in situ, or in a separate off-gas oxidizer.

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