Chalcopyrite Leaching Mechanisms and Applications
Summary
Chalcopyrite, the principal copper-bearing mineral in many porphyry deposits, has long presented a challenge to metallurgists owing to the formation of a passivating sulphur layer that retards metal release. Leaching mechanisms encompass purely chemical oxidation in acid–chloride or acid–nitrate media, bioleaching by acidophilic micro-organisms and galvanic interactions when chalcopyrite is coupled with more noble sulphide minerals. In each case the rate and extent of copper recovery depend on the control of interfacial reactions, mass transport through product films and the regeneration of oxidants. Recent advances have demonstrated that alternative solvents, elevated oxygen pressures, pre-treatments such as agglomeration and curing, and the deliberate use of galvanic coupling can overcome surface passivation. These developments not only enhance copper yields from primary sulphide ores but also enable more sustainable processing of low-grade concentrates, flotation tailings and waste streams. By integrating detailed kinetic and mineralogical studies with process design, researchers are closing the gap between laboratory mechanistic insight and large-scale heap or reactor operations, thereby contributing to global copper supply security and reducing environmental impact.
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Chalcopyrite Leaching Mechanisms and Applications publication trend
The graph below shows the total number of articles in chalcopyrite leaching mechanisms and applications across all publications each year (not limited to Nature Index journals).
Technical terms
Chalcopyrite: A copper–iron sulphide mineral (CuFeS₂) that is the most abundant source of copper in the Earth’s crust.
Leaching: The process of extracting metals from ores by dissolving them in a suitable aqueous or non-aqueous medium (lixiviant).
Lixiviant: A chemical solution, often acidic or containing oxidants, used to dissolve target metals from ore.
Galvanic interaction: An electrochemical coupling between two different minerals that enhances dissolution of the anodic (less noble) phase.
Passivation: Formation of an insulating layer (commonly elemental sulphur) on a mineral surface that inhibits further chemical reaction.
References
- Solvometallurgical process for extraction of copper from chalcopyrite and other sulfidic ore minerals. Green Chemistry (2020).
- Accelerating Copper Leaching from Sulfide Ores in Acid-Nitrate-Chloride Media Using Agglomeration and Curing as Pretreatment. Minerals (2019).
- Leaching Chalcopyrite Concentrate with Oxygen and Sulfuric Acid Using a Low-Pressure Reactor. Metals (2019).
- Electrochemical investigation of microbially and galvanically leached chalcopyrite. Hydrometallurgy (2021).
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