BORNITE OXIDATION

Oxidation of Bornite surface has been studied by cyclic voltammetry and X ray. Electrodes used in these investigations were done in inert atmosphere in order to avoid an initial oxidation. This precaution was necessary because oxygen reacts quickly with Bornite surface. Investigation found that potential has an anodic peak which is in concordance with preferential oxidation of iron in the sample. According to Buckley, Hamilton and Woods (3), reaction in acid condition is as follow:

•    Cu₅FeS_{4  =}  Cu₅S₄ + Fe⁺² + 2e-

In alkaline condition iron hydroxide III is an stable component in the zone with high potential.

• Cu₅FeS₄ + 3H₂O   ₌  Cu₅S₄ + Fe(OH)₃ +3H⁺ + 3e-

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