Lithium Brine Recovery via Countercurrent Selective Adsorption
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Solution Overview
Problem
Conventional methods for lithium recovery from brines are inefficient, require large amounts of water and chemicals, and are economically non-viable, especially in regions with limited fresh water resources.
Innovation Solution
A continuous countercurrent adsorption and desorption (CCAD) process using a lithium selective adsorbent in a CCIX-type system, with a multi-port valve system and multiple process zones, to selectively recover lithium from brines, optimizing fluid flow and adsorbent beds for enhanced recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional lithium recovery methods are used, then lithium can be recovered from brine, but large amounts of water and chemicals are required, increasing cost and environmental impact
Solution Approach 1:
The patent implements a continuous countercurrent adsorption-desorption process where brine continuously flows through adsorption columns while spent adsorbent is simultaneously regenerated in desorption columns. This continuous operation eliminates idle time and maintains constant lithium recovery efficiency without requiring batch processing, thereby improving productivity while reducing overall water and chemical consumption through optimized reagent circulation.
Solution Approach 2:
The process utilizes temperature changes to control the adsorption-desorption equilibrium. Adsorption occurs at lower temperatures where lithium selectively binds to the adsorbent, while desorption is achieved by heating the spent adsorbent to release concentrated lithium solution. This parameter change enables efficient lithium recovery with minimal water and chemical input, resolving the contradiction between resource consumption and recovery efficiency.
2Loss of substance
If conventional lithium recovery methods are used, then lithium can be recovered from brine, but high amounts of chemicals are required, increasing cost and environmental impact
Solution Approach 1:
The continuous countercurrent process maintains constant chemical utilization efficiency by continuously circulating adsorbent between adsorption and desorption stages. Chemicals are applied only during targeted desorption phases rather than throughout the entire process, reducing overall chemical consumption while maintaining high lithium recovery throughput through uninterrupted continuous operation.
Solution Approach 2:
Temperature parameter changes enable selective desorption of lithium from the adsorbent using minimal chemical input. By heating the spent adsorbent to specific temperatures, the process achieves efficient lithium release and concentration without requiring large amounts of chemical reagents, thereby improving productivity while reducing chemical consumption and environmental impact.
3Productivity
If continuous countercurrent adsorption and desorption process is implemented, then lithium recovery efficiency is enhanced and water consumption is reduced, but process complexity increases
Solution Approach 1:
The system is divided into separate functional modules: adsorption columns for lithium capture, desorption columns for regenerating the adsorbent and producing concentrated lithium solution, and associated pumping and heating systems. This segmentation allows each component to be optimized independently and simplifies operation by clearly defining the function of each unit, thereby managing process complexity while achieving high recovery efficiency.
Solution Approach 2:
The adsorbent material serves multiple functions: it selectively adsorbs lithium from dilute brine during the adsorption phase, then releases concentrated lithium solution during the desorption phase, and can be reused repeatedly after regeneration. This multi-functionality reduces the need for additional processing steps and materials, simplifying the overall process while maintaining high productivity and efficiency.
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
The CCAD process achieves high lithium recovery rates, reducing water and reagent usage, and produces a high-purity lithium product suitable for battery-grade materials, outperforming traditional fixed-bed systems in efficiency and cost-effectiveness.
Implementation Method 1
a lithium selective adsorbent in a multi-port valve system with multiple process zones, allowing for efficient adsorption and desorption of lithium from brine solutions
Implementation Method 2
a lithium selective adsorbent in a multi-port valve system with multiple process zones, allowing for efficient adsorption and desorption of lithium from brine solutions
Data Source
AI summary
This invention relates generally to a process for selective adsorption and recovery of lithium from natural and synthetic brines, and more particular to a process for recovering lithium from a natural or synthetic brine solution by passing the brine solution through a lithium selective adsorbent in a continuous countercurrent adsorption and desorption circuit.