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Metallurgy — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistryMetallurgy2 Marks
Question
What is Acid leaching?
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Answer

Leaching of sulphide ores such as $ZnS , PbS$ etc, can be done by treating them with hot aqueous sulphuric acid.
$
2 ZnS ( s )+2 H _2 SO _4( aq )+ O _2( g ) \rightarrow 2 ZnSO _4( aq )+2 S ( s )+ H _2 O
$
In this process the insoluble sulphide is converted into soluble sulphate and elemental sulphur.

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