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Acid Heap Leaching Process for Copper Oxide Ore

     

After crushing and screening of copper oxide ore, the oversize material undergoes conventional acid heap leaching operation, while the undersize material is subjected to concentration, slurry adjustment and granulation before heap construction and leaching. The leachate rich in copper ions is processed through solvent extraction, electrowinning and other procedures to obtain marketable cathode copper.

After concentrating the undersize material, a binder needs to be added for slurry adjustment. The adjusted slurry is mixed with pre-prepared acid-resistant crushed stones (particle size: 5mm-25mm) for granulation. During the granulated heap leaching process, the heap height ranges from 3 to 5 meters, the concentration of dilute sulfuric acid is 0.1 to 2 mol/L, and the leaching cycle lasts 1 to 2 months.

This process is particularly suitable for the development of refractory copper ore resources dominated by copper oxide ore in various regions of China, especially in the remote areas of the western plateau.

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