Polymer-Ceramic Lithium Membrane for Selective Brine Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lithium recovery methods from brines and lithium-containing wastes suffer from low selectivity, poor stability, and complex processes, leading to low purity lithium products and high chemical demands.
Innovation Solution
A membrane comprising a lithium target ion permeable polymer-ceramic composite material, specifically using Li1.3Al0.3Ti1.7(PO4)3 (LATP) ceramic associated with polyvinylidene fluoride (PVDF), allows selective permeation of lithium ions through an electrodialysis process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional lithium recovery methods (adsorption, precipitation, ion exchange, solvent extraction) are used, then lithium can be recovered from brine, but the separation of lithium and magnesium is difficult resulting in low purity lithium product
Solution Approach 1:
The patent employs a composite membrane structure combining organic polymer matrix with inorganic ceramic particles (LATP, Li2SiO3, or Li4SiO4). This composite approach integrates the advantages of both materials: the polymer provides mechanical flexibility and processability, while the ceramic particles provide high lithium ion conductivity and selectivity. The composite structure enables effective lithium-magnesium separation with high purity product recovery
Solution Approach 2:
The membrane utilizes porous ceramic particles embedded in the polymer matrix, creating a hierarchical pore structure that facilitates selective ion transport. The porous structure provides channels for lithium ion permeation while excluding larger magnesium ions, achieving high separation selectivity through size exclusion and electrostatic repulsion mechanisms
2Reliability
If existing lithium selective membranes are used, then lithium separation can be achieved, but they show relatively low lithium selectivity and poor stability
Solution Approach 1:
The composite membrane structure combines the chemical stability and mechanical strength of inorganic ceramic particles with the flexibility and processability of organic polymer matrix. This synergistic combination enhances both lithium selectivity (through ceramic ion conductivity) and membrane stability (through polymer structural integrity), overcoming the limitations of single-material membranes
Solution Approach 2:
The patent optimizes key parameters including ceramic particle size (0.1-10 μm), ceramic-to-polymer weight ratio (1:9 to 4:6), and membrane thickness (10-100 μm) to achieve optimal balance between lithium selectivity and membrane stability. These parameter adjustments enhance ion transport efficiency while maintaining structural integrity
3Productivity
If complex traditional processes (acid digestion, chemical leaching, solar pond concentration) are used, then lithium can be extracted from minerals and brines, but the processes are complex, time consuming and in high demand for chemicals
Solution Approach 1:
The patent replaces complex chemical processes (acid digestion, chemical leaching) with a physical membrane separation process. The electrodialysis system uses electric field-driven ion transport through selective membranes, eliminating the need for harsh chemicals and multiple processing steps while achieving high lithium recovery efficiency
Solution Approach 2:
The selective membrane acts as an intermediary that facilitates lithium ion transport from brine to permeate side while blocking magnesium ions. This intermediary structure enables direct separation without requiring complex chemical reactions, reducing process complexity and chemical demand
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 membrane achieves high lithium selectivity and stability, enabling efficient lithium recovery from various sources, including seawater, with lithium ion recovery rates up to 100-200 ppb, and scalability in electrodialysis applications.
Implementation Method 1
a target ion permeable polymer-ceramic composite material comprising: a target ion permeable ceramic and at least one target ion permeable organic polymer associated with the target ion permeable ceramic
Implementation Method 2
the membrane allows selective permeation of a target ion through the membrane
Data Source
AI summary
An ion permeable membrane for selective permeation of a target ion, preferably lithium, through the membrane, the membrane comprising a target ion permeable composite comprises a target ion permeable ceramic and at least one organic polymer associated with the target ion permeable ceramic.