Silver-Treated Pyrite Catalyst for Chalcopyrite Leaching
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Solution Overview
Problem
Current copper leaching processes from chalcopyrite concentrates using pyrite as a catalyst face limitations due to varying catalytic effects based on pyrite source, silver ion availability issues, and silver toxicity in biological systems, leading to inefficient copper recovery and silver loss.
Innovation Solution
Pretreating pyrite with silver ions before leaching in an acidic sulfate solution enhances its catalytic properties, allowing for effective copper extraction from chalcopyrite concentrates while minimizing silver loss by maintaining low solution potentials and recycling silver-treated pyrite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If silver ion concentration in the leach solution is increased to enhance catalytic effect, then copper leaching rate is improved, but argentojarosite precipitation increases causing silver loss
Solution Approach 1:
The patent applies preliminary action by pre-treating pyrite particles with silver ions before introducing them to the leach solution. This pre-adsorption of silver onto pyrite surface prevents silver from precipitating as argentojarosite during leaching, while still maintaining catalytic activity for copper extraction
Solution Approach 2:
Pyrite acts as an intermediary carrier that holds silver ions on its surface. The pyrite-silver complex serves as the actual catalyst, mediating between silver ions and chalcopyrite to enable catalysis without requiring high concentrations of free silver ions in solution
2Productivity
If pyrite is used as a catalyst for chalcopyrite leaching, then copper extraction is enabled, but catalytic efficiency varies depending on pyrite source and properties
Solution Approach 1:
The patent changes the key parameter by introducing silver ions that adsorb onto pyrite surface. This modification transforms pyrite from a variable natural catalyst into a standardized catalytic material with consistent performance, as the silver content can be controlled during pre-treatment regardless of pyrite source
3Productivity
If silver is added to biological leaching systems to catalyze copper dissolution, then copper extraction is enhanced, but bacterial growth is inhibited due to silver toxicity
Solution Approach 1:
Pyrite serves as an intermediary that carries silver ions, preventing direct contact between free silver ions and microorganisms. The silver is bound to pyrite surface, providing catalytic function while reducing toxic effects on bacterial communities in bioleaching systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process significantly accelerates copper extraction from chalcopyrite concentrates, achieving rapid and complete copper recovery with reduced silver loss, and allows for the recycling of silver-treated pyrite, improving overall process efficiency and economic viability.
Implementation Method 1
Particulate pyrite is exposed to a solution containing silver ions to form silver-treated pyrite
Implementation Method 2
pyrite may be used as a catalyst in the chemical leaching of copper from chalcopyrite concentrates in an acidic sulfate leach solution
Implementation Method 3
pyrite is used as a catalyst for ferric reduction
Implementation Method 4
in the presence of an oxygen-containing gas, under conditions whereby the pyrite is substantially unoxidized
Data Source
AI summary
A method of recovering copper from chalcopyrite concentrate by chemical leaching, using pyrite and silver. The catalytic properties of pyrite in the chalcopyrite leaching process are significantly enhanced by pretreating the pyrite with silver ions. Particulate pyrite is exposed to a solution containing silver ions to form silver-treated pyrite. Particulate chalcopyrite and the silver-treated pyrite are mixed in an acidic sulfate leach solution. The copper is leached from the concentrate in the leach solution in the presence of an oxygen-containing gas, under conditions whereby the pyrite is substantially unoxidized. The leached copper is recovered from the solution by conventional methods. The used silver-treated pyrite is recycled to the leaching process.