Pressure Oxidation: All minerals are oxidized into an acid-soluble solid basic sulphate. Example: Oxidation of chalcopyrite 6CuFeS 2 + 7.5O 2 + 2H 2 SO 4 + 2H 2 O -> 2[CuSO 4 2CuOH2] + Fe 2 O 3 + 12S° The sulphur and the hematite Fe2O3 solids do not or react in the subsequent stages of the CESL and are disposed of in their current forms as tails.
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