anionic polyacrylamide for gold and silver

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Polyacrylamide for gold and silver

1. Product characteristics

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.

2. Quality index

Appearance

Solid content(%)

Hydrolysis degree (%)

Molecular weight

(million)

Residual monomer content (%)

Dissolution time(hr)

RTFLOC A20**

≥89

6-45

(ADJUSTABLE)

5-25

(ADJUSTABLE)

≤0.05

≤1

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 life is 2 years.

5. Attention

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.