Lithium Selective Permeable Membrane for High-Speed Recovery
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Solution Overview
Problem
Current lithium recovery devices have a high installation and operation cost, and the recovery speed of lithium ions from raw to recovery liquid is not sufficient to meet the required low production cost, especially when used on a large scale.
Innovation Solution
A lithium selective permeable membrane with a lithium ion conductor and a lithium adsorption layer formed by acid treatment, used in a lithium recovery device that separates raw and recovery liquids with electrodes, enhancing ion conductivity and recovery efficiency through pH conversion and electrodialysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium recovery devices are installed and used on a large scale, then the total amount of lithium recovered increases, but the installation and operation cost increases
Solution Approach 1:
The patent changes the chemical parameter of the selective permeable membrane by forming a lithium adsorption layer through acid treatment, which fundamentally alters the membrane's ion selectivity properties. This enables high-speed lithium recovery while maintaining cost-effectiveness through improved recovery efficiency
Solution Approach 2:
The patent creates a composite structure combining a base selective permeable membrane with a lithium adsorption layer formed by acid treatment. This composite material achieves both high lithium selectivity and high recovery speed, resolving the contradiction between large-scale recovery needs and operational costs
2Productivity
If the recovery speed of lithium ions is increased to meet production cost requirements, then the production cost decreases, but the selectivity or efficiency of the membrane may be compromised
Solution Approach 1:
The patent applies local quality modification by treating only the surface of the selective permeable membrane with acid to form a lithium adsorption layer. This localized treatment enhances lithium recovery speed at the membrane surface while preserving the bulk membrane's selective permeability properties
Solution Approach 2:
The acid treatment is performed in advance to pre-form the lithium adsorption layer on the membrane surface before actual lithium recovery operations begin. This preliminary action ensures the membrane is optimized for high-speed recovery from the start, meeting production cost requirements
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 solution significantly increases the recovery rate of lithium ions into the recovery liquid, achieving a high recovery efficiency and reducing production costs by improving the recovery speed and ion conductivity.
Implementation Method 1
a selective permeable membrane main body constituted of a ion conductor of lithium as a main body
Implementation Method 2
a lithium adsorption layer that is formed on a surface of the selective permeable membrane main body on the first main surface side and selectively adsorbs the lithium ions
Implementation Method 3
the lithium adsorption layer is formed by an acid treatment on the surface of the selective permeable membrane main body
Implementation Method 4
Li (ions) in the raw liquid is moved in the recovery liquid by applying a voltage between both electrodes
Data Source
AI summary
The disclosure relates to recovering Li ions in a raw liquid into a recovery liquid at a high recovery speed. A lithium selective permeable membrane is constituted of a selective permeable membrane main body constituted of a lithium ion superconductor (ion conductor) having a particularly high ion conductivity and a Li adsorption layer formed as a thin layer on a raw liquid side (a first electrode) thereof. As a material constituting the selective permeable membrane main body, specifically, lanthanum lithium titanium oxide can be used. The Li adsorption layer is formed as a thin layer on a surface of the selective permeable membrane main body by carrying out a chemical treatment on the selective permeable membrane main body.