Heap Leach Irrigation Modeling for Acid Gap and Lift Overlap
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Solution Overview
Problem
Existing leach technologies face inefficiencies in copper recovery due to oxygen starvation in heap leach structures, refractory copper minerals, and variable recovery rates influenced by mineral mixtures, clays, and complex lattices, leading to suboptimal ore processing and increased costs.
Innovation Solution
A system utilizing secondary irrigation, acid gap management, and compaction to optimize leaching operations by integrating predictive models and real-time data analysis for ore routing and process adjustments, including mineralogy, irrigation, and heat data to enhance copper extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional heap leaching is used, then copper recovery is achieved, but oxygen starvation in heap leach structures limits recovery efficiency
Solution Approach 1:
The patent applies pneumatic principles by introducing air blowers and aeration systems that force air through the heap leach structure. This pneumatic approach delivers oxygen to oxygen-starved zones within the heap, enabling continued oxidation reactions and copper recovery without requiring complete heap replacement or redesign.
2Productivity
If acid is increased to leach refractory copper minerals, then copper extraction improves, but operational costs increase
Solution Approach 1:
The patent changes physical parameters (aeration rate, heap density, lift height) rather than solely relying on chemical parameter changes (acid concentration). By optimizing aeration to deliver oxygen to refractory zones, the system enables existing acid to work more effectively, reducing the need to increase acid dosage and thereby controlling operational costs.
Solution Approach 2:
The patent implements continuous aeration and multi-lift heap structures that maintain continuous oxygen supply and acid flow through the ore body. This continuity ensures that refractory copper minerals are progressively oxidized and leached over time, improving overall extraction without requiring excessive acid doses that would increase costs.
3Productivity
If variable recovery rates are accepted due to mineral mixtures and clays, then processing complexity is reduced, but ore processing efficiency decreases
Solution Approach 1:
The patent applies local quality principles by creating zones of different aeration intensity and acid flow rates within the heap structure. High-clay or refractory zones receive enhanced aeration and adjusted acid dosing, while other zones operate under standard conditions. This localized optimization improves overall processing efficiency without requiring complete system redesign.
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
Enhances copper recovery by optimizing leaching processes, reducing operational costs, and increasing ore reserves through improved understanding and control of chemical and physical forces in leach operations.
Implementation Method 1
oxidation is used. Sulfuric acid carries some oxidizing potential, but much of the driving force for leaching sulfides comes from the oxidation potential of ferric iron in solution
Implementation Method 2
Exposure to dilute sulfuric acid carries sufficient chemical energy to put the copper into solution
Implementation Method 3
When ferric iron oxidizes copper sulfide minerals, the ferric iron is converted to ferrous iron. The ferrous iron is converted back to ferric iron to further oxidize copper sulfide minerals
Implementation Method 4
Air or oxygen may either be introduced by physically piping or blowing it into the ore structure
Implementation Method 5
In heap bio-leaching, oxidizing microorganisms (which may be naturally occurring) convert ferrous iron to ferric iron and thus aid the leaching operation
Data Source
AI summary
The system may include a secondary irrigation feature that determines a percent of overlap of each of a plurality of submodules in a second lift over each of a plurality of submodules in a first lift and adjusts at least one of leaching operations or a leaching model based on the total tonnage weighted average of metal in the second lift. The method may further comprise determining an acid gap based on a difference between total acid given and total acid consumption; and further adjusting at least one of the leaching operations or the leaching model based on the acid gap. The method may further comprise determining a percentage of compacted material based on the material that is compacted and irrigated divided by the material that is irrigated; and further adjusting at least one of the leaching operations or the leaching model based on the percentage of compacted material.