Zinc normally occurs in the sulphide form although occurs also as oxide and silicate where different processing techniques are required for ore processing.
In processing zinc sulphide the ore is calcined by roasting in furnaces and oxidising to zinc oxide. The oxideis the subjected to a leaching process using sulphuric 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 sulphuric 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 theliquor.
2. Quality index
3. Instruction for use
(1)It's very important to make the efficient dispersion during using, otherwise will cause agglomerate
and "fish eyes", dissolving time will be longer.
(2)Low-hardness water for use; avoid adopting such tank or pool, which will influence on water quality.
(3)Improve the water temperature to accelerate the dissolving velocity, but not exceed 50.
(4)Stirring will accelerate dissolving, but tough stirring will make the dispersant chain broken and
degradation. Shipshape agitator with 200 - 500 rpm is the best choice.
(5)Commonly mix the product into 0.05%--0.5%(w/w)solution as reserve.
(6)Adjust the optimum dosage of product according to application condition.
4. Product package
25 Kg paper plastic three-in-one compound woven bags, or according to users’ requirement; Its shelf lifeis 2 years.
The product is moisture absorbent, thus to protect from damp and moist for conservation. It should be stored in a dry and ventilate storehouse, and not be exposed to air and sunshine.
Anionic polyacrylamide(flocculant) for Lead and Zinc processing: