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Extracting Copper From Chalcopyrite

     

Hydrometallurgy is another method for extracting copper from chalcopyrite. Due to its lower operating cost, it can be applied to the hydrometallurgical leaching of copper from low-grade copper ores. Common leaching agents are acidic chloride media and acidic sulfate media.

In sulfate media, the leaching kinetics are generally slow, and complete copper leaching is difficult to achieve. This is because a passivation layer forms on the mineral surface; additionally, a complex purification and impurity removal process is required.

In acidic chloride media, salts have high solubility in chloride-containing solutions, and copper ions can be stabilized in concentrated chloride systems. Thus, the leaching rate in chloride media is faster than in sulfate media. However, acidic chloride media have drawbacks: strong corrosivity, difficulty in electrowinning high-quality copper from them, and the need for complex purification and impurity removal processes after leaching.

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