Polymer-Modified Li/Al-LDH Adsorbent for Low-Concentration Lithium Extraction
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Solution Overview
Problem
There is a scarcity of materials and methods that are both efficient and cost-effective for extracting low-concentration lithium resources, particularly from sources like water byproducts from mining or shale gas production.
Innovation Solution
A composition comprising a Li/Al-LDH substrate modified with a polymer, prepared via a one-step coprecipitation method, which enhances the adsorption of lithium from low-concentration sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional hydrometallurgical methods are used for lithium extraction, then the extraction process can be performed, but lithium selectivity is poor and purification becomes complicated
Solution Approach 1:
The patent employs Li/Al-LDH with a layered porous structure that provides selective channels for lithium ion transport. The interlayer spacing and channel dimensions are optimized to preferentially accommodate lithium ions while excluding larger impurity ions, achieving high selectivity without complex purification steps
Solution Approach 2:
The patent creates a composite material by combining Li/Al-LDH with polymer coatings or surface modifications. This composite structure integrates the selective ion transport properties of LDH with the functional advantages of polymers, enhancing both selectivity and ease of operation
2Productivity
If polymer modification is applied to Li/Al-LDH, then lithium extraction performance is improved, but material complexity increases
Solution Approach 1:
The patent applies polymer modification only to the surface or specific regions of the Li/Al-LDH particles rather than throughout the entire bulk structure. This localized modification enhances lithium extraction performance at the active sites while maintaining the simple bulk structure and avoiding excessive material complexity
Solution Approach 2:
The patent merges the advantages of Li/Al-LDH (high lithium selectivity) with polymer benefits (improved extraction kinetics and stability) into a single integrated material system. This combination achieves enhanced productivity while the merging process itself simplifies the overall material design compared to using separate treatment steps
3Measurement precision
If adsorption method is used for lithium extraction, then high selectivity and low energy consumption are achieved, but efficiency for low-concentration lithium sources is insufficient
Solution Approach 1:
The patent performs preliminary concentration or pre-treatment of low-concentration lithium sources before the adsorption process. This may involve adjusting pH, adding coagulants, or using membrane pre-concentration to increase lithium concentration to levels where the adsorption method becomes highly effective, thereby overcoming the limitation of low-concentration source 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
The polymer-modified Li/Al-LDH composition demonstrates improved lithium extraction performance, is recyclable, and operates under environmentally friendly conditions, with a pollution-free desorption process.
Implementation Method 1
the adsorption is recognized globally as the premier commercial technique due to its high selectivity for lithium ions
Implementation Method 2
During the adsorption/desorption process, LiCl intercalates/extracts from the adsorbent to maintain charge balance
Data Source
AI summary
The present disclosure pertains to methods for enhancing the properties of conventional Li/Al-LDH by integrating polymers to provide compositions comprising a Li/Al-LDH material and a polymer. The present disclosure further pertains to methods of using such polymer-modified-LDH to improve lithium adsorption and extraction performance. The disclosed methods can comprise incorporating the polymer during the precipitation reaction or by mixing the Li/Al-LDH product with a polymer solution under specific conditions. During the lithium extraction process, the disclosed compositions comprising a Li/Al-LDH material and a polymer can be used as an excellent lithium adsorbent to capture lithium ions from low-concentration lithium resources due to its improved physicochemical properties. The disclosed compositions comprising a Li/Al-LDH material and a polymer provides compositions for lithium extraction from low concentration resources, as well as expands the scope of lithium adsorbent material development.