Lithium Extraction Process Limiting Impurity Precipitation
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Solution Overview
Problem
The existing lithium extraction processes using ion exchange materials often result in the formation of precipitates in the lithium salt solution, which can interfere with equipment and reduce efficiency, particularly due to the presence of impurities like calcium, barium, and strontium.
Innovation Solution
A process involving lithium-selective ion exchange materials that absorb lithium from a liquid resource, followed by elution with an acidic solution to form a lithium-enriched solution, with subsequent removal of impurities using nanofiltration, precipitation, or multivalent-cation-selective ion exchange resins to prevent precipitation and concentrate lithium, including iterative steps to accumulate lithium concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ion exchange materials are used to extract lithium from liquid resources, then lithium concentration in the solution is improved, but precipitates form due to impurities which interfere with equipment and reduce efficiency
Solution Approach 1:
The patent applies preliminary action by removing impurities (calcium, barium, strontium) from the liquid resource before the lithium extraction process. This is achieved through pre-treatment steps that precipitate or remove these multivalent cations, preventing them from forming precipitates during subsequent lithium extraction and concentration operations.
Solution Approach 2:
The patent uses intermediary substances such as phosphoric acid or other reagents that selectively react with multivalent cations (calcium, barium, strontium) to form soluble complexes or precipitates that can be removed. These intermediaries facilitate the separation of harmful impurities from the lithium-containing solution without affecting the lithium extraction process.
2Device complexity
If impurities are not removed, then the extraction process is simpler, but precipitates form that interfere with process equipment
Solution Approach 1:
The patent implements preliminary impurity removal through pre-treatment steps that occur before the main lithium extraction process. This includes adding reagents to precipitate multivalent cations or using selective adsorption materials, thereby preventing equipment interference in subsequent operations while maintaining overall process efficiency.
Solution Approach 2:
The patent converts the harmful effect of multivalent cations (which cause precipitate formation) into a beneficial separation process. By adding reagents that selectively react with these impurities, the patent transforms them into removable precipitates or complexes, thereby purifying the solution and protecting equipment while recovering the impurities as byproducts.
3Quantity of substance
If lithium concentration is increased through iterative elution, then lithium recovery is improved, but impurity concentration also increases leading to precipitate formation
Solution Approach 1:
The patent applies preliminary action by removing impurities before the iterative elution concentration process. This ensures that as lithium concentration increases through repeated elution cycles, the absence of multivalent cations prevents precipitate formation even at high lithium concentrations.
Solution Approach 2:
The patent uses intermediary reagents or selective separation materials that remain effective throughout the iterative elution process. These intermediaries continuously bind or precipitate multivalent cations, allowing lithium concentration to increase without compromising solution stability or causing equipment interference.
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 process effectively limits and eliminates the formation of precipitates, enhancing the efficiency of lithium extraction by progressively removing impurities and maintaining a high lithium concentration in the acidic solution, thus preventing equipment issues and improving process reliability.
Implementation Method 1
contacting a lithium-selective ion exchange material with a liquid resource comprising lithium to allow said lithium-selective ion exchange material to absorb lithium from said liquid resource
Implementation Method 2
contacting said lithium-enriched ion exchange material with an acidic solution such that lithium and impurities are eluted from said lithium-enriched ion exchange material
Implementation Method 3
removing at least some of the impurities from said first impurities-enriched lithiated acidic solution to form a lithium-enriched acidic solution
Data Source
AI summary
The present invention relates to recovery of lithium from liquid resources to produce lithium solutions while limiting impurity precipitation in the lithium solutions.