™ 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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Lead and Zinc
Zinc normally occurs in the sulfide form although occurs also as
oxide and silicate where different processing techniques are required for ore
processing.
In processing zinc sulfide the ore is calcined by roasting in
furnaces and oxidizing to zinc oxide. The oxide is then subjected to a leaching
process using sulfuric acid as the leaching liquor. A neutral leach at around
PH 5 and an acid leach at PH 2.5 are carried out to dissolve all the zinc
values into the sulfuric acid. Some plants use an additional hot leach
thickening stage to enhance recover even further. A counter current decantation
system is normally used with the overflow liquor from the neutral thickening
stage reporting to the purification stage.
During all these stages of leaching flocculants are used to
promote rapid settlement and clarification of the liquor.
For neutral leach the recommended
sedimentation reagents are:
Qualfloc A0714, A1418,
A2022 and A2424
For acid leach (and hot acid leach) then the
recommended sedimentation reagents are:
Qualfloc N0010,
A0714, A2022,
A2526 and A1418