The use of Zn powder is one effective way to a solution containing a concentration
small gold. Zn powder is added into the solution will precipitate the gold and silver metals. Principle
This precipitation series based Clenel, based on sequence differences in electro-chemical activity
of the metals in cyanide solutions, namely Mg, Al, Zn, Cu, Au, Ag, Hg, Pb, Fe, Pt. each metal
is on the left of the bond may precipitate complex metal sianidanya it replaces.
So in fact not only can urge Zn Au and Ag, but Cu and Al can also be used,
but because the more expensive it is better to use Zn. Making process of the gold-silver
rich solutions using Zn powder is called “Merrill Crowe process.
Tags: gold