Which Techniques Extract Copper from Low-Grade Oxide Ores Profitably?

2026-01-13

Extracting copper from low-grade oxide ores profitably often involves techniques that are energy-efficient, environmentally friendly, and economically viable. Several methods are commonly employed, including:

1. Heap Leaching

• Aperçu: Heap leaching is one of the most common and cost-effective techniques for extracting copper from oxide ores. Crushed low-grade ore is piled into heaps, and a leach solution (usually dilute sulfuric acid) is applied to dissolve the copper.
• Processus :
  • Ore is broken down into smaller pieces to increase surface area.
  • The leach solution percolates through the heap, dissolving copper ions.
  • The copper solution or pregnant leach solution (PLS) is collected for recovery.
• Avantages :
  • Low operational costs.
  • Adapté aux opérations à grande échelle.
  • Can be used for low-grade ores.

2. Solvent Extraction and Electrowinning (SX-EW)

• Aperçu: SX-EW is paired with heap leaching for copper recovery. This hydrometallurgical process is efficient and widely used for oxide ores.
• Processus :
  • Copper ions from the pregnant leach solution are transferred into an organic solvent in the solvent extraction phase.
  • The copper in the organic solvent is stripped into an electrolyte solution.
  • Electrowinning then recovers pure copper from the electrolyte via electroplating onto cathodes.
• Avantages :
  • Produces high-purity copper (up to 99.99%).
  • Energy-efficient when compared to traditional smelting.
  • Uses low-temperature processes.

3. Agitation Leaching

• Aperçu: Similar to heap leaching but occurs in reactors or tanks to increase extraction efficiency. The crushed ore is mixed with the leach solution and agitated to enable faster reaction rates.
• Avantages :
  • Higher extraction efficiency compared to heap leaching.
  • Useful for finely ground ores or ores with low permeability.
• Inconvénients :
  • Higher costs compared to heap leaching due to added infrastructure.

4. Bioleaching

• Aperçu: Bioleaching employs microbes to process low-grade copper oxide ores. Specific bacteria catalyze oxidation reactions that release copper ions from ores.
• Processus :
  • Crushed ore is inoculated with bacteria, often in a heap or stir tank.
  • The bacteria convert copper sulfides or oxides into soluble copper ions, which can be collected and processed, often through SX-EW.
• Avantages :
  • Eco-friendly, with minimal environmental impact.
  • Energy-efficient and cost-effective for low-grade ores.
  • Reduces the need for harsh chemicals.
• Limitations :
  • Slower extraction rates compared to chemical methods.
  • Requires controlled conditions for microbial activity.

5. Leaching with Ammonia or Chloride Solutions

• Aperçu: Certain copper oxide ores react well with ammonium or chloride-based leaching solutions.
• Processus :
  • The ore is treated with ammonia (for copper oxides such as malachite or azurite) or chloride solutions, which selectively dissolve copper ions.
  • Pregnant leach solutions are subjected to purification and recovery processes (e.g., SX-EW).
• Avantages :
  • Effective at selectively dissolving copper without impacting surrounding materials.
• Inconvénients :
  • Not all oxide ores are amenable to this process.

Economic and Environmental Benefits of These Techniques

The listed techniques (especially heap leaching, SX-EW, and bioleaching) are widely regarded as the most cost-effective ways to profitably extract copper from low-grade oxide ores. These methods offer low energy consumption compared to traditional smelting and reduce environmental impacts, making them popular for mining low-grade deposits today.

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