Coated Ion Exchange Particles for Acid-Stable Lithium Extraction
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Solution Overview
Problem
Lithium extraction using inorganic ion exchange materials faces challenges with dissolution and degradation, particularly during lithium elution in acid and uptake from liquid resources, which reduces the performance and lifespan of these materials.
Innovation Solution
Coating ion exchange particles with materials like TiO2, ZrO2, or SiO2 to protect them from dissolution and degradation, allowing for the use of concentrated acid solutions while enabling lithium ion diffusion and hydrogen ion exchange, thereby maintaining ion exchange capacity and extending material lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If concentrated acid solution is used to elute lithium, then lithium extraction efficiency is improved, but ion exchange material dissolution and degradation worsen
Solution Approach 1:
A coating layer comprising metal oxides (such as TiO2, ZrO2, SiO2) or their mixtures is applied to the surface of the ion exchange material particles. This coating acts as an intermediary barrier that prevents direct contact between the concentrated acid solution and the ion exchange material, thereby preventing dissolution and degradation while allowing lithium ions to diffuse through and be eluted efficiently.
2Reliability
If coating material is applied to protect ion exchange material, then material stability is improved, but lithium ion diffusion capability worsens
Solution Approach 1:
The coating layer is designed with porous structure that allows lithium ions to diffuse through while providing protective function. The porous structure maintains ion exchange capability by enabling ion transport pathways, thus preventing the coating from acting as a complete barrier to lithium ion diffusion.
Solution Approach 2:
The coating layer parameters (thickness, porosity, composition) are optimized to balance protection and ion diffusion. By controlling these parameters, the coating provides sufficient protection against acid dissolution while maintaining adequate lithium ion diffusion rates for efficient 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 coating effectively prevents dissolution and degradation of ion exchange materials, enabling repeated lithium extraction cycles with high efficiency and maintaining material performance, even in the presence of concentrated acids.
Implementation Method 1
the coating material prevents dissolution of the ion exchange material
Implementation Method 2
the coating material allows diffusion of lithium ions and hydrogen ions to and from the ion exchange material
Implementation Method 3
Inorganic ion exchange materials absorb lithium ions from a liquid resource while releasing hydrogen ions
Data Source
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AI summary
The present invention relates to the extraction of lithium from liquid resources such as natural and synthetic brines, leachate solutions from mineral, and recycles products using a coated ion exchange particle comprising an ion exchange material and a coating material.