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Acid Heap Leaching for Oxidized Copper Ores

     

The Method of Acid Heap Leaching for Oxidized Copper Ores

After the crushed and screened copper ore is sorted, the oversize material undergoes standard acid heap leaching. The undersize material is concentrated, thickened, and pelletized before being restacked for further leaching.

The solution rich in copper ions is extracted using solvent electrocoagulation to produce marketable cathode copper. After concentrating the undersize material, a binder is added to form slurry. The slurry is mixed with pre-prepared 5mm-25mm diameter acid-resistant crushed stone to form pellets for stacking on the heap.

During pelletizing and leaching operations, the pellet stack height is 3~5 meters, the dilute sulfuric acid concentration in the solution is between 0.1~2mol/L, the spraying intensity is 0.2-0.5 L/min, and each leaching cycle lasts for 1-2 months. This method effectively utilizes previously underutilized clay-containing copper ores with high mudstone-forming potential, thereby improving mining's overall utilization rate, reducing costs, and increasing profits.

Especially suitable for application in regions throughout China, particularly the copper ore-rich but challenging areas such as western high plateaus where oxidized copper ores are predominant.

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