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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Outline <strong>of</strong> method<br />
using halogen-containing organic system<br />
(HOS)<br />
•Dissolution<br />
In our experiments, HOS is composed <strong>of</strong> I 2 , NaI <strong>and</strong> ethanol. A<br />
triiodide ion, I 3 - is isolated <strong>from</strong> this system <strong>and</strong> active for the<br />
dissolution <strong>of</strong> metal. A dark brown color <strong>of</strong> the system reflects<br />
presence <strong>of</strong> I 3 - .<br />
I 2 +I - (in NaI) ⇔ I 3<br />
-<br />
The I 3- ion is effective oxidant toward noble metal, <strong>and</strong> in the<br />
presence <strong>of</strong> I - , reacts with <strong>gold</strong> to form the very stable [<strong>Au</strong>I 4 ] -<br />
complex.<br />
2<strong>Au</strong> + 3I 3- ⇔ 2[<strong>Au</strong>I 4 ] - +I -
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