Copper Sulfide Heap Leaching Iodine Volatilization Control
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Solution Overview
Problem
High iodine volatility and adsorption in leaching solutions used for copper extraction from copper sulfide ores lead to increased operating costs and environmental impacts due to iodine loss and tube deterioration in heap leaching processes.
Innovation Solution
Feeding leaching solutions containing Fe(III) and iodide ions independently to stacked copper sulfide ores prevents iodine volatilization and adsorption, maintaining solution integrity and reducing material degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If iodine is added to the leaching solution to promote copper leaching from poorly soluble copper sulfide ores, then the leaching rate of copper is improved, but iodine is lost by volatilization from the surface of stacked ores resulting in increased operating costs and environmental impacts
Solution Approach 1:
The invention divides the leaching solution into two separate solutions: one containing Fe(III) ions and another containing iodide ions. These are fed through independent routes to the stacked ores, preventing premature formation of iodine vapor and reducing volatilization losses while maintaining copper leaching efficiency.
Solution Approach 2:
The invention uses Fe(III) ions as an intermediary substance that reacts with iodide ions in situ within the ore heap to generate iodine. This indirect generation of iodine through chemical reaction prevents direct contact of iodine with the atmosphere, thereby reducing volatilization.
2Productivity
If iodine is added to the leaching solution to enhance copper extraction, then copper leaching efficiency is improved, but iodine is adsorbed by tubes used for feeding the leaching solution causing tube deterioration and iodine loss
Solution Approach 1:
The invention segments the iodine delivery system by separating Fe(III) ion solution and iodide ion solution into different feeding routes. This prevents the formation of molecular iodine in the feeding tubes, eliminating adsorption and deterioration issues.
Solution Approach 2:
The invention extracts the problematic component (molecular iodine) from the feeding system by keeping iodine in ionic form (iodide) during transport. Iodine is generated only at the reaction site within the ore heap, removing the source of tube deterioration.
3Device complexity
If mixed leaching solution containing both Fe(III) ions and iodide ions is fed to stacked ores, then the process is simplified, but iodine volatilization and tube deterioration occur due to premature iodine formation
Solution Approach 1:
The invention divides the leaching process into two separate solution streams that are fed independently. This segmentation prevents premature chemical reactions that would generate volatile iodine, while the complexity increase is offset by the elimination of iodine loss and associated costs.
Solution Approach 2:
The invention performs preliminary separation of the reactants (Fe(III) ions and iodide ions) before they reach the reaction zone. By keeping them separate during transport and only allowing them to mix within the ore heap, the system prevents unwanted side reactions and iodine volatilization.
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
This method effectively reduces operating costs and environmental impacts by minimizing iodine loss and tube deterioration while maintaining efficient copper leaching rates.
Implementation Method 1
leaching solution containing the Fe (III) ion and other leaching solution containing the iodide ion are fed through routes independent of each other
Implementation Method 2
iodine is lost by volatilization from the surface of a layer of stacked ores
Implementation Method 3
iodine, being a single substance is adsorbed by and penetrated into the tube by some degree depending on the material properties because of hydrophobic properties of iodine
Data Source
AI summary
The present invention provides a method of leaching copper from a copper sulfide ore, wherein operating costs and environmental impacts can be effectively reduced. The present invention is a method of leaching copper from a copper sulfide ore by a process of leaching a layer of stacked ores, wherein the leaching solution containing Fe (III) ion and other leaching solution containing iodide ion are fed through routes independent of each other to a layer of stacked ores containing a copper sulfide ore.