QualflocPAM Polymer Flocculants

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Bestac International, Inc.

P.O. Box 585

Wayne, NJ 07470  USA

Tel: 973 6336878 

Fax: 973 6330828


Email: service@qualfloc.com


[Bestac International, Inc.]

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 for 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