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Metallurgy — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistryMetallurgy2 Marks
Question
Explain Cyanide leaching.
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Answer

In the concentration of gold ore, the crashed ore of gold is leached with aerated dilute solution of sodium cyanide. Gold is converted into a soluble cyanide complex. The gangue, aluminosilicate remains insoluble.
$
4 Au ( s )+8 CN ^{-}( aq )+ O _2( g )+2 H _2 O (1) \rightarrow 4\left[ Au ( CN )_2\right]^{-}( aq )+4 OH ^{-}( aq )
$

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