™ PAM
Polymer Flocculants
Qualfloc™
Bestac
International, Inc.
P.O.
Box 585
Wayne, NJ 07470 USA
Tel: 973 6336878
Fax: 973 6330828
www.qualfloc.com
Email: service@qualfloc.com
[Bestac International, Inc.]
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for
Gold/Silver
Most gold and silver processes today extract the mineral by use of
either Carbon in Pulp (CIP) or Carbon in Leach (CIL) processes. Here activated
carbon is used to recover gold, which has been dissolved by the addition of
cyanide.
Prior to leaching, the ore is crushed and screened then passed to ball mills
where water and lime is added. The solids are then settled in a pre-leach
thickener by the addition of a flocculant to promote rapid settlement and good
compaction. The underflow is then subjected to the leaching process via a
series of leaching tanks. The tanks allow sufficient retention time for the
gold and silver to be dissolved by the cyanide process.
The slurry then moves to a series of carbon adsorption tanks where
the gold and silver are removed from solution. This is done by feeding carbon
through the tanks, in the opposite direction to the slurry flow, with the
gold/silver then adsorbing to the carbon granules.
By the time the slurry has reached the final adsorption tank most
of the precious metals have been removed. The barren slurry, or tailings, is
then pumped to the tailings lagoons. By the time the carbon reaches the first
adsorption tank it has recovered most of the gold and silver from solution.
This ‘loaded carbon’ is then pumped to the elution circuit where the gold and
silver are washed off with superheated water. The washed solution is passed to
the electrowinning circuit for metals recovery.
Recommended products for a sedimentation aid in the pre leach thickener:
Qualfloc A0714, A1418,
A2424, A2526 and A3226