Lithium Bisulfate Leaching and Electromembrane Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for extracting lithium from lithium-containing materials are inefficient and costly, particularly due to the use of sulfuric acid, which also limits the recycling and recovery of lithium bisulfate and sulfate compounds.
Innovation Solution
A method involving the leaching of lithium bisulfate roasted lithium-containing materials under specific conditions to produce an aqueous composition that can be partially converted into lithium hydroxide using an electromembrane process, allowing for the recycling and reuse of lithium sulfate and sulfuric acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sulfuric acid is used for extracting lithium from lithium-containing materials, then lithium extraction can be achieved, but the process becomes costly and inefficient with limited recycling capability
Solution Approach 1:
The patent implements a recovery system where lithium bisulfate and sulfate compounds that would traditionally be discarded are instead recovered and recycled back into the extraction process. The spent acid solution containing lithium bisulfate is regenerated and reused, transforming a waste stream into a valuable resource that maintains extraction efficiency while eliminating substance loss.
Solution Approach 2:
The process enables self-service by using the extracted lithium compounds to regenerate and sustain the extraction medium itself. The lithium bisulfate produced during extraction serves dual purposes: as a product and as a regenerant for the sulfuric acid solution, creating a self-sustaining cycle that reduces external input requirements and improves overall process efficiency.
2Productivity
If sulfuric acid is used for lithium extraction, then the extraction process can proceed, but recycling and recovery of lithium compounds is limited
Solution Approach 1:
The system recovers lithium bisulfate and sulfate compounds from the spent extraction solution and regenerates sulfuric acid for reuse. This creates a closed-loop process where materials are continuously recycled rather than discarded, significantly enhancing the recycling capability while maintaining steady extraction rates.
Solution Approach 2:
The sulfuric acid solution serves multiple functions: it acts as the primary extraction agent, becomes a carrier for lithium compounds during extraction, and then serves as a feedstock for regeneration processes. This multi-functionality increases process versatility and adaptability without compromising extraction productivity.
3Productivity
If lithium bisulfate roasted material is leached to produce aqueous composition, then lithium hydroxide can be produced, but process complexity increases
Solution Approach 1:
The patent combines multiple process functions into integrated operation sequences. The leaching of lithium bisulfate roasted material is merged with the regeneration of sulfuric acid and the production of lithium hydroxide into a coordinated process flow. This integration reduces the number of separate unit operations and simplifies overall process complexity while maintaining lithium hydroxide production capability.
Solution Approach 2:
The process maintains continuous operation where the output of one stage becomes the input of the next without interruption. Lithium bisulfate roasted material is continuously leached, the aqueous composition is continuously processed to produce lithium hydroxide, and the spent solution is continuously regenerated. This continuous flow eliminates batch processing steps and reduces operational complexity.
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 reduces costs by replacing sulfuric acid with lithium bisulfate, enables the efficient recovery and reuse of lithium sulfate, and facilitates the production of lithium hydroxide while minimizing environmental impact.
Implementation Method 1
leaching a lithium bisulfate roasted, lithium-containing material under conditions suitable to obtain an aqueous composition comprising a lithium compound
Implementation Method 2
submitting the first aqueous composition comprising lithium sulfate and/or lithium bisulfate to an electromembrane process under suitable conditions for at least partial conversion of the lithium sulfate and/or lithium bisulfate into lithium hydroxide
Data Source
AI summary
The present disclosure relates to a method for treating an electromembrane process aqueous composition comprising sodium and/or potassium sulfate, said process comprising removing water from said electromembrane process aqueous composition under conditions suitable for substantially selectively precipitating sodium and/or potassium sulfate monohydrate.