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How is acid leaching done for the sulphi...

How is acid leaching done for the sulphide ores ?

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(i) Leaching of sulphide ores such as ZnS, PbS etc., can be done by treating them with hot aqueous sulphuric acid
`2ZnS_((s)) + 2H_(2)SO_(4(aq)) + O_(2(g)) rarr 2ZnSO_(4(aq)) + 2S_((s)) + H_(2)O`
(ii) In this process the insoluble sulphide is converted into soluble sulphate and elemental sulphur.
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