Below the melting point below the temperature of the oxidation of sulfur to ore leaching of brass, the same phenomenon of passivation occurs, further the female slow reaction. This is either due to the presence of solid sulfur entrapped outside the particles or due to the formation of copper-rich sulfur-rich intermediate minerals. To overcome this passivation, one method is to activate the chalcopyrite; the other is to enhance the oxidizing ability of the leachant.
Minerals activation method comprising: thermally activated, by heating the mineral composition change structure; hydrometallurgical activation, altered mineral composition by wet chemical reactions; mechanical activation, increased mineral ultrafine grinding specific surface.
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