Coated Ion Exchange Particles for Acid-Stable Lithium Elution
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Solution Overview
Problem
Lithium extraction using inorganic ion exchange materials faces challenges due to dissolution and degradation during lithium elution in acid and uptake from liquid resources, which reduces the performance and lifespan of these materials.
Innovation Solution
Coated ion exchange particles comprising an ion exchange material and a protective coating material, such as carbides, oxides, or polymers, that prevent dissolution and allow lithium and hydrogen ion diffusion, enabling the use of concentrated acids for efficient lithium extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If concentrated acid solution is used to elute lithium ions, then lithium extraction efficiency is improved, but inorganic ion exchange materials dissolve and degrade
Solution Approach 1:
A protective coating layer is applied to the inorganic ion exchange material particles, serving as an intermediary barrier between the material and the concentrated acid solution. This coating allows lithium ions to pass through while preventing the acid from dissolving and degrading the underlying ion exchange material, thus enabling efficient lithium extraction without compromising material stability.
Solution Approach 2:
A thin protective coating film is formed on the surface of the inorganic ion exchange material particles. This flexible shell structure permits ion diffusion while providing chemical protection against concentrated acid, resolving the contradiction between extraction efficiency and material durability.
2Productivity
If inorganic ion exchange materials are used for lithium extraction, then lithium ions can be absorbed from liquid resources, but the materials dissolve and degrade during the process
Solution Approach 1:
The protective coating acts as an intermediary layer that maintains the integrity of the inorganic ion exchange material while allowing it to perform its lithium ion absorption function. The coating prevents direct contact between the acid environment and the material, preserving compositional stability without reducing absorption capacity.
Solution Approach 2:
The invention creates a composite structure combining the inorganic ion exchange material with a protective coating material. This composite particle structure integrates the high lithium ion absorption capacity of the inorganic material with the chemical stability and acid resistance of the coating, resolving the contradiction between productivity and compositional stability.
3Productivity
If repeated lithium extraction cycles are performed, then lithium production increases, but material performance decreases due to degradation
Solution Approach 1:
The protective coating serves as a durable intermediary shield that protects the inorganic ion exchange material throughout repeated extraction cycles. This allows the material to maintain its performance characteristics over extended operational periods, enabling sustained high-volume lithium production without the performance degradation that would normally limit material lifespan.
Solution Approach 2:
The protective coating prevents material degradation during repeated use, effectively extending the recoverable service life of the ion exchange material. By protecting against dissolution and degradation, the coating enables more extraction cycles before the material needs to be discarded, thus increasing both productivity and duration of action.
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 coated ion exchange particles effectively protect the ion exchange material from degradation, allowing for repeated lithium extraction cycles and maintaining performance, thereby enhancing the efficiency and lifespan of the extraction process.
Implementation Method 1
the coating material allows diffusion of lithium ions and hydrogen ions to and from the ion exchange material
Implementation Method 2
Inorganic ion exchange materials absorb lithium ions from a liquid resource while releasing hydrogen ions, and then elute lithium ions in acid while absorbing hydrogen ions
Data Source
AI summary
The present invention relates to the extraction of lithium from liquid resources such as natural and synthetic brines, leachate solutions from minerals, and recycled products.