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Indirect Gold Heap Leaching Process

     

The impurity removal process is carried out as follows: Activated carbon is added into the pregnant leach solution obtained from gold heap leaching. After 10 to 30 days of adsorption, the adsorption-saturated activated carbon is extracted for desorption, producing desorption wastewater and desorbed activated carbon. The desorbed activated carbon is then sent for 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 to a sedimentation tank, where high-efficiency impurity remover is dosed for impurity removal treatment. The resulting precipitates are subjected to pressure filtration and then stored in the warehouse.

The applied high-efficiency impurity remover features high impurity removal efficiency, fast sedimentation rate, and strong removal capacity for impurities including copper, mercury, zinc and nickel. It also has a wide adaptable pH range and will not interfere with the gold leaching process. This process realizes long-term recycling and zero discharge of the leachate, maintains impurities in the leachate at a low concentration to improve the gold leaching rate, and enables the recovery of impurity metals.

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