We have listed various methods and their features which are used for recovering precious metals like gold and silver. Read on to know more.
- Merrill Crowe
Merrill Crowe method needs lower capital and operating costs as well. It manages the solutions entailing high silver and gold scrap recovery content. It is proven to be 99.95 percent efficient, which is quite high. This method is also capable to treat high grade solutions which are produced by carbon elution. An alternative to this method is electrowinning.
However, the pregnant solution may require clarification as well as deoxygenation. The low metallic concentration calls for low zinc. It is dependent on the pH and the concentration level of free cyanide. The residual entails cyanides like copper and arsenic.
- Adsorption with Activated Carbon
It doesn’t need any kind of pretreatment of a pregnant solution. It is not at all dependent on the metal concentration. It needs a large particular surface to work on. The pulp by this method needs no kind of clarification.
The fouled carbon should be regenerated when heating. It has a large carbon inventory. The solution has to undergo at least 5 to 6 columns. The process has high operating costs, royalty payments and lower loading capacity.
- Ion exchange resins
This method needs no kind of washing, revitalization or heat treatment. There is also a high abrasion resistance in the adsorption tanks. This method calls for high selectivity.
This process also has high operating costs, royalty payments and lower loading capacity. And the resin must be created at an acidic medium only.
- Solvent extraction
Solvent extraction also demands high selectivity. It also doesn’t need any kind of washing, heat treatment or revitalization.
It is also a costly process which involves new technology and its stripping is difficult as well.
It has a low resistance time in terms of minutes. It doesn’t use any kind of chemicals. It manages the solutions that entail high gold and silver content. The energy cost in this method per cubic meters of the pregnant solution is lower than the traditional systems.
The sacrificial anode must be replaced on a frequent basis. It highly calls for a precise initial pH control. It entails new technology and the product is super high in iron content.
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