Fly Ash REE Extraction via Leaching Collection System
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Solution Overview
Problem
Current methods for extracting rare earth elements (REEs) from coal fly ash are inefficient and costly, making it difficult to meet national security and high-tech demands, and coal fly ash poses environmental risks due to groundwater contamination.
Innovation Solution
A method involving a collection system installed beneath a fly ash pond, where water is applied to leach REEs and other materials from the fly ash, using a network of pipes to collect and process the leached water, employing various techniques such as precipitation, ultrafiltration, and adsorption to concentrate and extract REEs, allowing for repeated flushing cycles and potential recycling of water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water is applied to leach REEs from fly ash, then extraction efficiency is improved, but environmental contamination risk increases
Solution Approach 1:
The patent extracts REEs from fly ash by leaching them into collection systems buried beneath the pond, separating valuable materials from harmful waste. The collection system captures leached water containing REEs, preventing direct environmental contamination while enabling efficient extraction.
Solution Approach 2:
The patent introduces an intermediary collection system between the fly ash and the environment. This system mediates the leaching process by capturing contaminated water, allowing REE extraction while preventing direct environmental release of harmful substances.
2Productivity
If collection systems are installed beneath fly ash ponds, then material extraction is improved, but system complexity increases
Solution Approach 1:
The collection system serves multiple functions: it extracts REEs from fly ash, collects leached water for processing, and prevents environmental contamination. This multi-functionality reduces the need for separate systems, thereby managing complexity while improving material extraction.
Solution Approach 2:
The system allows fly ash to self-leach REEs into the collection system through natural percolation, reducing the need for complex active extraction mechanisms. The passive collection approach simplifies the overall system while maintaining effective material extraction.
3Manufacturing precision
If multiple processing techniques are employed, then extraction purity is improved, but process complexity increases
Solution Approach 1:
The patent segments the extraction process into distinct stages: leaching, collection, and processing. Each stage uses specific techniques (precipitation, ultrafiltration, adsorption) to progressively purify REEs, achieving high extraction purity while managing complexity through systematic division of tasks.
Solution Approach 2:
The patent employs parameter changes in the processing techniques, such as adjusting pH for precipitation, molecular weight cutoff for ultrafiltration, and adsorbent properties for adsorption. These parameter-based separations achieve high extraction purity through natural physical and chemical differences, reducing the need for complex mechanical separation 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
This approach enables economically efficient extraction of REEs from fly ash, reducing environmental risks by removing pollutants and converting fly ash into valuable materials, including anthropogenic soil, thereby addressing national security and environmental concerns.
Implementation Method 1
applying water to the top surface of the fly ash pond, above the spaced laterals, such that the water leaches through fly ash and into the collection system
Implementation Method 2
employing various techniques such as precipitation, ultrafiltration, and adsorption to concentrate and extract REEs
Implementation Method 3
employing various techniques such as precipitation, ultrafiltration, and adsorption to concentrate and extract REEs
Implementation Method 4
employing various techniques such as precipitation, ultrafiltration, and adsorption to concentrate and extract REEs
Data Source
AI summary
When coal is combusted, such as in the process of generating electricity, fly ash is produced in abundant quantities. Methods and systems are provided for extracting materials, such as rare earth elements critical for national security or nuclear power generation, from fly ash. A method of processing fly ash includes installing a collection system in a fly ash pond. The method further includes applying water to the top surface of the fly ash pond, such that the water leaches through fly ash and into the collection system. The leached water is processed to remove materials, such as rare earth elements. Systems are also provided.