A trial of extracting gold from stream sediment and High Au/Ag ore ...
A trial of extracting gold from stream sediment and High Au/Ag ore ...
A trial of extracting gold from stream sediment and High Au/Ag ore ...
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•Deposition<br />
After <strong>gold</strong> is dissolved, ascorbic acid is added to reduce I 2 .<br />
I 2 ⇒ 2I -<br />
This reduction results in deficiency <strong>of</strong> I 3 - , HOS begins to<br />
behave as “poor-solvent” for <strong>gold</strong>. A dark brown color <strong>of</strong> HOS<br />
is lost reflecting depletion <strong>of</strong> I 3 - . Gold can be precipitated.<br />
Hydrogen peroxide liquid (H2O2) can be oxidized the above solution.<br />
2 I − → I 2<br />
The system turns into original HOS which can dissolve <strong>gold</strong>.
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