Flash Crystallization for Lithium Carbonate Purification
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Solution Overview
Problem
Existing methods struggle to economically extract lithium from low-grade lithium-bearing materials such as waste tailings from borates mining and clay formations, resulting in low purity and high lithium losses.
Innovation Solution
A process involving flash crystallization to purify a lithium-bearing solution, which includes evaporating the solution to remove a first group of impurities, performing flash crystallization within a specific temperature range to remove a second group of impurities, and reacting the purified solution with a metal carbonate to produce high-purity lithium carbonate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional extraction methods are used on low-grade lithium-bearing materials, then processing is simpler, but lithium recovery is low and purity is poor
Solution Approach 1:
The extraction process is divided into distinct stages: initial leaching to extract lithium from low-grade materials, followed by flash crystallization to purify the solution, and final precipitation to produce high-purity lithium carbonate. This segmentation allows each stage to be optimized independently, achieving high lithium recovery and purity while managing process complexity through modular design.
Solution Approach 2:
The process utilizes controlled changes in temperature and pressure parameters during flash crystallization to selectively precipitate impurities while maintaining lithium in solution. By dynamically adjusting these parameters, the system achieves high purity lithium carbonate production from low-grade materials without requiring overly complex processing equipment.
2Manufacturing precision
If flash crystallization is performed within a specific temperature range, then lithium carbonate purity is improved, but energy consumption increases
Solution Approach 1:
The flash crystallization process exploits phase transitions of water and dissolved salts at specific temperatures to separate impurities from lithium-bearing solution. By controlling the temperature range during this phase transition, high-purity lithium carbonate is formed while minimizing energy consumption compared to conventional high-temperature processing methods.
Solution Approach 2:
The flash crystallization step rapidly transitions the solution through the critical temperature range in a controlled manner, skipping the extended heating period required by conventional methods. This rushing through the phase transition zone achieves high purity product with reduced energy input, as the process leverages the natural cooling and crystallization dynamics rather than prolonged heating.
3Adaptability or versatility
If lithium is extracted from low-grade materials, then resource utilization is improved, but extraction efficiency is reduced
Solution Approach 1:
The process performs preliminary leaching treatment on low-grade lithium-bearing materials to pre-concentrate lithium in the solution phase before the flash crystallization step. This preliminary action makes the subsequent purification and production steps more efficient, allowing high extraction efficiency to be achieved from low-grade materials that would otherwise be difficult to process.
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 process achieves lithium recovery of at least 90 wt % and produces lithium carbonate with a purity of at least 90 wt %, significantly reducing lithium losses and operating costs.
Implementation Method 1
evaporating the lithium-bearing solution to precipitate a first group of impurities
Implementation Method 2
performing a flash crystallisation step within a predetermined temperature range to crystallise a second group of impurities from the first purified solution
Data Source
AI summary
A method of forming lithium carbonate from a lithium-bearing solution including:evaporating the lithium-bearing solution to precipitate a first group of impurities;removing the first group of impurities to form a first purified solution; andperforming a flash crystallisation step within a predetermined temperature range to crystallise a second group of impurities from the first purified solution;removing the second group of impurities from the first solution to form a second purified solution, wherein at least 90 wt % of lithium is recovered from the first purified solution; andreacting the second purified solution with a metal carbonate to form lithium carbonate of at least 90 wt % purity.