International, Inc. Tel: 973 6336878 Fax: 973 6330828 Email: email@example.com [Bestac International, Inc.] ©Copyright, All rights reserved.
Bestac International, Inc.
Tel: 973 6336878
Fax: 973 6330828
[Bestac International, Inc.]
©Copyright, All rights reserved.
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