Mine Waste Backfill for Acid Neutralization and Metal Retention
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Solution Overview
Problem
Mine waste and mining-related residuals pose significant environmental and health risks due to the release of heavy metals and acidity, with existing regulatory frameworks and remediation technologies failing to effectively address the long-term contamination and pollution from abandoned and active mines.
Innovation Solution
A method involving the treatment of mine waste to produce a stable, non-acidic mine filling product that can be used to backfill and close mines, thereby preventing the migration of hazardous substances and acidity, utilizing chemical and physical processes to alter the mine waste's properties and create a product that retains heavy metals and neutralizes acidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If mine waste is left in piles, tailing ponds, and embankments, then storage capacity is improved, but environmental pollution and hazardous substance release worsen
Solution Approach 1:
The patent converts harmful mine waste containing heavy metals and acidity into a beneficial backfill material through chemical treatment. The treated waste is used to fill abandoned mine voids, simultaneously achieving waste storage and preventing future hazardous substance release. This transforms the waste from a pollution source into a resource for mine closure.
Solution Approach 2:
The patent applies chemical treatment processes that change the physical and chemical parameters of mine waste. Through neutralization reactions and stabilization treatments, the waste's acidity is reduced and heavy metals are immobilized, transforming it from a hazardous material into a stable backfill substance suitable for permanent storage in mine voids.
2Adaptability or versatility
If mines are left open for future use, then economic flexibility is improved, but acid mine drainage and continuous hazardous substance release worsen
Solution Approach 1:
The patent performs preliminary closure actions by filling abandoned mine voids with treated mine waste before final abandonment. This preliminary backfilling prevents acid mine drainage and hazardous substance release, allowing the mine to be permanently closed while eliminating ongoing environmental harm. The treated waste serves as both closure material and long-term protective barrier.
3Reliability
If traditional remediation methods are used, then treatment capability is improved, but cost and complexity worsen
Solution Approach 1:
The patent enables mine waste to treat itself by using the waste as both the material to be treated and the backfill material. The chemical treatment process stabilizes the waste in place, creating a self-contained solution that prevents future pollution without requiring ongoing external remediation infrastructure or complex treatment systems.
Solution Approach 2:
The patent merges multiple functions into a single process: waste treatment, waste storage, and mine closure are combined into one integrated operation. By treating the waste in situ and using it as backfill material, the patent eliminates the need for separate treatment facilities, transport infrastructure, and ongoing maintenance systems, thereby reducing overall complexity.
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 treated mine waste product effectively reduces the hazardous nature of mine waste, prevents the drainage of hazardous materials from mines, and provides a permanent solution for mitigating the release of heavy metals and acidity into the environment, offering a cost-effective and sustainable approach to mine closure and pollution mitigation.
Implementation Method 1
utilizing chemical and physical processes to alter the mine waste's properties and create a product that retains heavy metals and neutralizes acidity
Implementation Method 2
create a product that retains heavy metals and neutralizes acidity
Data Source
AI summary
Treatment technology directed to using mine waste as a raw material to manufacture a mine filling product for use as a suitable precursor product or mine filling product to be used as a backfill material to close a mine. The precursor product or mine filling product retains its metals and is not be able to generate acidity. According to the disclosure, the precursor product or mine filling product, when placed in a mine, may also remove metals from mine fluids in the mine it contacts, and still retain the metals it hosted when it was a mine waste prior to it being used as a raw material to manufacture the precursor stowing backfill product.