Integrated Lithium Recovery with pH-Controlled Sorbent Exchange
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Solution Overview
Problem
Existing lithium extraction methods from liquid resources face inefficiencies due to sub-optimal pH conditions, leading to reduced lithium uptake, lower purity, and increased material degradation in ion exchange processes.
Innovation Solution
A system and method that maintains pH above 5 by adding a base to the liquid resource, uses a lithium-selective sorbent to absorb and release lithium ions, and includes subsystems for carbonate production and water removal to enhance lithium recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lithium extraction methods are used without pH control, then the process is simpler, but lithium uptake is reduced and purity is lower
Solution Approach 1:
The patent applies parameter changes by controlling and maintaining pH above 5 throughout the ion exchange process. This pH control parameter optimization enables the lithium-selective sorbent to achieve higher lithium uptake and purity without requiring fundamentally different extraction technology, thus improving manufacturing precision through parameter optimization rather than adding complex equipment
Solution Approach 2:
The patent introduces a pH control system as an intermediary component that mediates between the liquid resource and the ion exchange process. By adding base to maintain optimal pH conditions, the system creates a favorable environment for lithium extraction, improving purity while adding only moderate complexity through a controlled chemical addition process
2Productivity
If pH is not maintained above 5, then less base is consumed, but lithium uptake by the sorbent is reduced
Solution Approach 1:
The patent optimizes the pH parameter to be maintained above 5, which creates optimal conditions for the lithium-selective sorbent to achieve high lithium uptake. This parameter optimization ensures that the sorbent operates at peak efficiency, maximizing productivity while the base consumption is controlled through precise pH management rather than excessive addition
3Manufacturing precision
If pH is maintained above 5 by adding base, then lithium uptake and purity are improved, but material degradation increases
Solution Approach 1:
The patent maintains pH above 5 as an optimized parameter range that balances lithium extraction efficiency with material stability. By controlling pH within this specific range rather than using extreme alkaline conditions, the system achieves high lithium purity while minimizing unnecessary acceleration of sorbent degradation, thus extending operational duration through careful parameter management
4Manufacturing precision
If conventional extraction without carbonate removal is used, then the process is shorter, but lithium solution purity is reduced
Solution Approach 1:
The patent applies the extraction principle by introducing a specific step to remove carbonates from the mother liquor. This targeted removal of interfering substances (carbonates) purifies the lithium solution by separating the desired lithium product from contaminants, thereby improving manufacturing precision through selective extraction of impurities
Solution Approach 2:
The patent segments the extraction process into distinct stages: initial lithium extraction, carbonate removal from mother liquor, and final lithium solution purification. This segmentation allows each step to be optimized independently, with carbonate removal specifically addressing purity concerns without requiring complete process redesign, thus balancing processing time with purity improvement
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 lithium recovery by maintaining optimal pH conditions, improving lithium uptake and purity, and increasing the overall efficiency of the extraction process.
Implementation Method 1
an ion exchange unit, the ion exchange unit comprising a lithium-selective sorbent, wherein the lithium-selective sorbent absorbs lithium ions from the liquid resource and releases lithium upon subsequent exposure to an acidic eluate
Implementation Method 2
a pH modulation unit, wherein the pH of the liquid resource is modulated to a value of 5 and above with the addition of a base
Implementation Method 3
a second subsystem configured to remove carbonates from the carbonate mother liquor to yield a depleted carbonate mother liquor
Implementation Method 4
a third subsystem configured to remove water from the depleted carbonate mother liquor to yield a concentrated 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.