Lithium Carbonate Purification via Magnesium Extraction
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Solution Overview
Problem
The conventional process for preparing lithium carbonate from brine is complex and time-consuming due to the need for separating multiple ionic components, particularly magnesium ions, which complicates the enrichment of lithium ions.
Innovation Solution
A method involving the removal of magnesium ions from brine, followed by lithium ion adsorption onto an adsorbent, desorption into a strong acid solution, and subsequent chemical reaction with a carbonate precursor to produce high-purity lithium carbonate, simplifying the process and reducing the need for additional impurity removal steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional separation processes are used to remove multiple ionic components from brine, then lithium carbonate purity can be achieved, but the process complexity and time increase significantly
Solution Approach 1:
The patent extracts and removes only the problematic magnesium ions from brine using selective precipitation, rather than attempting to separate all ionic components. This targeted removal simplifies the overall process while maintaining lithium carbonate purity, as magnesium is the primary impurity affecting product quality.
Solution Approach 2:
The patent changes the chemical parameters of the brine by adjusting pH and adding specific reagents to selectively precipitate magnesium ions. By controlling these parameters, the process achieves effective impurity removal without requiring complex multi-step separation procedures.
2Manufacturing precision
If conventional separation processes are used to remove multiple ionic components from brine, then lithium carbonate purity can be achieved, but the processing time increases significantly
Solution Approach 1:
The patent removes only the critical magnesium impurity through selective precipitation rather than performing exhaustive separation of all ions. This targeted approach dramatically reduces processing time while still achieving the required 99% lithium carbonate purity for battery applications.
Solution Approach 2:
The patent performs preliminary removal of magnesium ions before the main lithium carbonate precipitation process. This preliminary action prevents magnesium from interfering with subsequent steps, eliminating the need for multiple remedial separation stages and reducing overall processing time.
3Manufacturing precision
If multiple impurity removal steps are implemented, then lithium carbonate purity improves, but the number of process steps and operational complexity increase
Solution Approach 1:
The patent extracts and removes only the problematic magnesium ions using selective precipitation with hydroxide or carbonate reagents. This single targeted removal step simplifies operations compared to conventional multi-step processes that attempt to separate all ionic components, while still achieving 99% purity.
Solution Approach 2:
The patent uses a universal approach where a single precipitation step serves multiple functions: removing magnesium ions, controlling pH, and preparing the solution for subsequent lithium carbonate precipitation. This multi-functionality reduces the number of operational steps required.
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 enables the production of highly pure lithium carbonate with a purity of 99% in a shorter timeframe by focusing on magnesium removal and lithium ion adsorption/desorption, enhancing efficiency and reducing processing time.
Implementation Method 1
adding an adsorbent to the brine, from which the magnesium ions Mg2+ have been removed, to adsorb lithium ions Li+ to the adsorbent
Implementation Method 2
providing the adsorbent having the lithium ions Li+ adsorbed thereto to a strong acid solution to desorb the lithium ions Li+ from the adsorbent
Data Source
AI summary
The present disclosure provides a method of preparing highly pure lithium carbonate from brine. The method includes adding an adsorbent to the brine, from which the magnesium ions Mg2+ have been removed, to adsorb lithium ions Li+ to the adsorbent, followed by providing the adsorbent having the lithium ions Li+ adsorbed thereto to a strong acid solution to desorb the lithium ions Li+ from the adsorbent; enriching the strong acid solution in which the lithium ions Li+ are desorbed from the adsorbent; and obtaining lithium carbonate Li2CO3 through chemical reaction between the lithium ions Li+ in the enriched solution and a carbonate precursor.