Lithium Brine Purification Using Membrane Separation and Vaporization
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Solution Overview
Problem
Current methods for lithium extraction from brine sources are inefficient, labor-intensive, and result in low yield, with evaporation processes taking months and recovering only 50-60% of the original lithium, while there is a growing demand for renewable energy storage solutions.
Innovation Solution
A method involving an adsorption/desorption process followed by membrane separations and vaporization to concentrate and convert lithium, including counter-current membrane operations and vaporizers to separate high and low lithium concentration streams, with optional impurity removal and recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If evaporation ponds with chemical additives are used to extract lithium from brine, then lithium can be recovered, but the process takes months to complete and recovers only 50-60% of the original lithium
Solution Approach 1:
The patent replaces the traditional mechanical evaporation process with a membrane separation system that uses selective permeation through membranes to separate lithium from brine, enabling faster processing and higher recovery yields
Solution Approach 2:
The patent changes the separation mechanism from evaporation-based concentration to membrane-based selective permeation, altering the physical parameters of the separation process to achieve both speed and efficiency improvements
2Productivity
If hard rock mining with acid digestion is used to extract lithium, then lithium can be recovered, but the process is labor intensive
Solution Approach 1:
The patent replaces labor-intensive acid digestion and hard rock mining processes with an automated membrane separation system that uses selective permeation to extract lithium, reducing manual intervention and improving efficiency
Solution Approach 2:
The membrane separation system operates autonomously to separate lithium from brine based on selective permeation properties, eliminating the need for manual acid treatment and rock processing steps
3Productivity
If adsorbents are used to selectively recover lithium from brine, then lithium can be concentrated, but large volumes of water must be handled
Solution Approach 1:
The patent extracts water from the lithium-bearing brine through selective permeation membranes that allow water to pass through while retaining lithium, effectively separating the two substances and reducing water volume
Solution Approach 2:
The patent changes the concentration parameter by using membrane separation to directly concentrate lithium in the permeate stream, achieving high lithium concentration without requiring large water volumes for dilution
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
This method achieves high lithium recovery yield, up to 90%, by efficiently concentrating and converting lithium from brine sources, optimizing water and energy use, and minimizing impurities.
Implementation Method 1
using a series of membrane separations to separate a brine stream with high lithium concentration, as a non-permeating stream, from a brine stream with low lithium concentration, as a permeating stream
Implementation Method 2
vaporization to concentrate and convert lithium
Data Source
AI summary
Lithium recovery processes are described using vaporization and conversion techniques. A vaporizer can be used to concentrate lithium and precipitate impurities. A conversion process can be used to replace anions in lithium bearing streams by adding a second anion and precipitating lithium in a salt with the second anion. Rotary separation can be used to separate the precipitated lithium salt.