Lithium-Selective Sorbents for Low-Acid Brine Extraction
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Solution Overview
Problem
Existing methods for lithium extraction from liquid resources face challenges such as low efficiency, high acid consumption, and rapid degradation of ion exchange materials, leading to suboptimal lithium recovery and purity.
Innovation Solution
The use of lithium-selective sorbents and ion exchange materials, combined with controlled pH adjustment and recycling of lithium-depleted liquid resources, enhances lithium recovery by optimizing ion exchange processes to improve uptake, elution kinetics, and material durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ion exchange materials are used for lithium extraction, then lithium recovery can be achieved, but the materials degrade rapidly and acid consumption is high
Solution Approach 1:
The patent modifies the chemical parameters of the ion exchange material by incorporating fluorinated groups and adjusting the basic structure to create a more stable framework that resists acid degradation while maintaining lithium selectivity
Solution Approach 2:
The patent creates a composite ion exchange material combining organic fluorinated compounds with inorganic support structures to achieve both high lithium selectivity and enhanced chemical stability against acid attack
2Quantity of substance
If conventional ion exchange materials are used, then lithium extraction can occur, but the uptake capacity is low
Solution Approach 1:
The patent introduces lithium-selective functional groups at specific locations within the ion exchange material structure, creating high-affinity binding sites that concentrate lithium uptake capacity in regions optimized for selectivity while the overall structure maintains stability
Solution Approach 2:
The patent employs composite structures combining high-capacity lithium-binding moieties with stable structural frameworks to achieve both increased uptake capacity and maintained material stability
3Productivity
If pH adjustment is performed without optimization, then ion exchange can proceed, but efficiency is reduced
Solution Approach 1:
The patent designs the ion exchange material to inherently buffer pH changes during the extraction process, reducing the need for external pH adjustment and minimizing acid consumption while maintaining high recovery efficiency
Solution Approach 2:
The patent optimizes the pH range for maximum lithium selectivity and uptake by modifying the ion exchange material's chemical properties, enabling efficient extraction at pH conditions that reduce acid consumption
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 results in higher lithium purity, increased uptake capacity, slower material degradation, reduced acid consumption, and enhanced overall recovery efficiency, producing a synthetic lithium solution suitable for industrial applications.
Implementation Method 1
contacting a lithium-selective sorbent to the concentration-adjusted liquid resource, wherein the lithium-selective sorbent absorbs lithium ions from the concentration-adjusted liquid resource
Implementation Method 2
contacting the lithium-selective sorbent to an eluent solution, wherein said lithium-selective sorbent releases the sorbed lithium, producing a synthetic lithium solution
Data Source
AI summary
The present invention relates to the extraction of lithium from liquid resources such as natural and synthetic brines, leachate solutions from clays and minerals, and recycled products.