Integrated Lithium Extraction via Solid Adsorbent
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Solution Overview
Problem
Current lithium extraction methods from aqueous sources are inefficient, costly, and environmentally benign, particularly those involving evaporation ponds and solid or liquid absorbents, which face challenges in scaling and water usage.
Innovation Solution
A method involving an intercalated resin to remove divalent ions from an aqueous source, followed by a solid adsorbent and liquid absorbent process to concentrate lithium, with a focus on recycling water and using a purification process to produce a clean water stream, optimizing lithium recovery and minimizing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If evaporation ponds with chemical additives are used to precipitate lithium, then lithium can be recovered, but the process requires months to complete and yields only 50-60% lithium
Solution Approach 1:
The patent extracts the lithium separation function from the complex evaporation pond process by introducing a selective solid adsorbent that specifically binds lithium ions from brine, enabling rapid separation without requiring months of evaporation time or multiple chemical precipitation steps
Solution Approach 2:
The patent changes the separation mechanism from slow evaporation and chemical precipitation to rapid adsorption by modifying the process parameters - using a solid adsorbent with specific surface properties that selectively bind lithium ions, reducing recovery time from months to hours while increasing yield
2Productivity
If solid adsorbents are used to selectively recover lithium, then lithium yield increases, but a large quantity of vessels and piping are required
Solution Approach 1:
The patent merges the adsorption and washing functions into a single integrated column unit, where the solid adsorbent is contained within a column that allows brine to flow through and lithium to be selectively captured, eliminating the need for separate vessels and complex piping systems
Solution Approach 2:
The solid adsorbent column serves multiple functions simultaneously - it acts as both the separation medium and the containment structure, while also providing the flow path for brine and the collection point for concentrated lithium, reducing overall system complexity
3Productivity
If liquid absorbents are used in pulse columns to extract lithium, then absorbent efficacy increases, but water usage increases and scaling is difficult
Solution Approach 1:
The patent employs a solid adsorbent that can be easily regenerated and reused multiple times, replacing the liquid absorbent system that requires continuous water input and generates wastewater, thereby reducing overall water consumption while maintaining high extraction efficacy
Solution Approach 2:
The patent transitions from liquid to solid phase absorbent, fundamentally changing the physical state parameter of the extracting medium, which enables better water efficiency and easier scaling while maintaining or improving absorbent efficacy through selective surface binding
4Productivity
If pre-conditioning steps are used to remove divalent ions, then absorbent efficacy is improved, but the process becomes more expensive and less efficient
Solution Approach 1:
The patent takes out the divalent ion removal function from the pre-conditioning steps by designing a solid adsorbent with selective binding sites that preferentially capture lithium ions over divalent ions like calcium and magnesium, eliminating the need for separate softening steps and reducing process cost
Solution Approach 2:
The solid adsorbent column performs multiple separation functions simultaneously - it selectively captures lithium while allowing divalent ions to pass through, combining the softening and lithium extraction functions into a single unit operation that is both simpler and more cost-effective
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 integrated process efficiently recovers lithium with reduced water usage and environmental impact, enhancing scalability and cost-effectiveness by leveraging aqueous recycle streams and purification techniques.
Implementation Method 1
removing divalent ions from the aqueous source by exposing the aqueous source to an intercalated resin that absorbs alkali metals
Implementation Method 2
Many techniques use a solid adsorbent that selectively recovers lithium
Implementation Method 3
Other techniques use a liquid absorbent that selectively recovers the lithium followed by a wash step
Data Source
AI summary
Methods and apparatus for integrated alkali metal extraction are disclosed. Various exchange media are used to separate a chosen alkali metal, usually lithium, from a source stream and render the alkali metal into a product. In some cases, absorption/desorption processes, using solid and/or liquid absorption media, are used to purify a brine stream into a concentrate stream having elevated concentration of the desired alkali metal. Various processes, which may include use of liquid absorbents, electrochemical processing, centrifugation, evaporation, electrical mixing and separation, or combinations thereof, are used to separate the chosen metal from the source, and aqueous streams are recycled among the processes to facilitate the various separations.