Electrochemical Lithium Extraction and Conversion From Low-Grade Brines
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Solution Overview
Problem
Conventional lithium extraction methods from low-grade sources are inefficient, economically unviable, and environmentally detrimental, with long recovery times, high water consumption, and significant carbon emissions.
Innovation Solution
A tandem method involving a lithium-extraction reactor and a lithium-conversion reactor, using electrochemical processes to selectively incorporate and extract lithium cations into a working electrode, followed by conversion into lithium-containing products like lithium carbonate or lithium hydroxide, utilizing materials such as lithium-selective compounds and catalytically active electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If solar evaporation is used to extract lithium from brine, then lithium can be recovered, but the recovery time is extremely long (10-24 months)
Solution Approach 1:
The patent replaces the passive mechanical evaporation process with an active electrochemical extraction system. Instead of relying on solar energy and natural evaporation, the invention uses electrochemical cells with selective membranes to actively transport lithium ions from brine to product, dramatically accelerating the recovery process from months to hours or days.
Solution Approach 2:
The invention changes the fundamental operating parameters from passive evaporation conditions to active electrochemical conditions. By applying electrical potential and using selective ion-exchange membranes, the system transforms the extraction mechanism, enabling controlled and rapid lithium recovery regardless of environmental conditions.
2Productivity
If solar evaporation is used to extract lithium from brine, then lithium can be recovered, but the water consumption is extremely high (500,000 gallons/ton of Li2CO3)
Solution Approach 1:
The patent replaces the water-intensive evaporation process with an electrochemical system that uses electrical energy to drive ion transport. The selective membranes concentrate lithium ions directly from the brine without requiring massive volumes of water to be evaporated, reducing water consumption by orders of magnitude.
Solution Approach 2:
The invention fundamentally changes the extraction parameter from thermal evaporation to electrochemical ion transport. This parameter change enables lithium recovery with minimal water consumption, as the process selectively moves lithium ions through membranes rather than evaporating bulk water.
3Productivity
If solar evaporation coupled with chemical conversion is used, then lithium carbonate can be produced, but carbon emissions are significant (3 tons/ton of Li2CO3)
Solution Approach 1:
The patent replaces the chemical carbonation process (which releases CO2) with an electrochemical conversion process. Instead of adding sodium carbonate to lithium chloride in a chemical reaction, the system uses electrochemical cells to directly convert lithium ions into lithium carbonate or other lithium products, eliminating the need for external chemical additives and associated emissions.
Solution Approach 2:
The invention changes the conversion mechanism from chemical carbonization to electrochemical synthesis. By applying electrical potential and controlling ion transport through selective membranes, the system produces lithium carbonate without the carbon emissions inherent in traditional chemical conversion processes.
4Productivity
If solar evaporation is used on low-grade lithium sources, then lithium extraction is possible, but the process is not economically viable
Solution Approach 1:
The invention changes the extraction parameters to enable efficient recovery from low-grade sources. The electrochemical system with selective membranes can operate at lower lithium concentrations and requires smaller processing volumes, making low-grade brines economically viable by reducing infrastructure and operational costs.
Solution Approach 2:
The patent employs selective membranes with specific properties optimized for lithium ion transport. These membranes provide local selectivity and efficiency, enabling the system to extract lithium effectively even from dilute sources, thereby improving the economic viability of low-grade lithium extraction.
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
Enables efficient, scalable, and sustainable lithium extraction from low-grade sources with minimal environmental impact, reducing recovery time and carbon emissions to zero.
Implementation Method 1
applying a negative potential to the working electrode, thereby electrochemically incorporating lithium into the working electrode
Implementation Method 2
applying a positive potential to the working electrode, thereby extracting lithium from the working electrode into the recovery solution
Implementation Method 3
applying a conversion potential between the electrodes, thereby converting the lithium cations into a lithium-containing product
Data Source
AI summary
Described herein are tandem methods for producing a lithium-containing product from a lithium-containing solution and systems for performing. A method may involve supplying the lithium-containing solution into a lithium-extraction reactor and applying a negative potential to the working electrode, thereby electrochemically incorporating lithium into the working electrode. The lithium-containing solution may then be replaced with a recovery solution and a positive potential to the working electrode, thereby extracting lithium from the working electrode into the recovery solution. The recovery solution comprising lithium cations is then transferred to a lithium-conversion reactor, and a conversion potential is applied between the electrodes, thereby converting the lithium cations into a lithium-containing product, such as lithium carbonate (Li2CO3), lithium hydroxide (LiOH), lithium chloride (LiCl), and lithium sulfate (Li2SO4). For example, carbon dioxide (CO2) may be pumped through the recovery solution while applying the conversion potential to lithium carbonate (Li2CO3).