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Indirect Gold Heap Leaching Process

     

Activated carbon is added into the pregnant leach solution from gold heap leaching. After 10 to 30 days, the adsorption-saturated activated carbon is collected for desorption, by which desorption wastewater and desorbed activated carbon are obtained.

The desorbed activated carbon is subjected to acid pickling treatment. The acidic wastewater generated from acid pickling, the aforementioned desorption wastewater, and the smelting wastewater produced during gold slime smelting are all delivered into a sedimentation tank, where high-efficiency impurity remover is dosed for impurity removal. The resulting precipitate is treated by pressure filtration and then sent to storage.

The high-efficiency impurity remover, which features high impurity removal efficiency, fast sedimentation speed, capacity to remove impurities such as copper, mercury, zinc and nickel, a wide applicable pH range, and no adverse impact on gold leaching. The process realizes long-term recycling and zero discharge of the leaching solution, maintains impurities in the leaching solution at a low concentration to improve the leaching rate, and enables the recovery of impurity metals.

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