Lithium Extraction from Sedimentary Deposits via Oxidant Leaching
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Solution Overview
Problem
Conventional lithium extraction methods from hard rock and brine resources face geographical accessibility issues and require intensive physicochemical processing, with sedimentary deposits being underutilized due to tightly bound lithium and complex separation processes.
Innovation Solution
A method involving the use of an oxidant and acid to selectively leach lithium from sedimentary ore, which is more loosely bound, reducing the energy required for extraction and allowing for a more efficient recovery process, including the use of electrodialysis to separate lithium from other species in the leachate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to extract lithium from hard rock and brine resources, then lithium can be extracted, but the process requires intensive physicochemical processing and faces geographical accessibility issues
Solution Approach 1:
The patent changes the chemical parameters of the extraction process by using oxidants (such as potassium permanganate, sodium persulfate, or hydrogen peroxide) combined with acids to alter the oxidation state of lithium-bearing minerals in sedimentary deposits, making lithium more accessible and reducing processing complexity compared to conventional hard rock and brine methods
Solution Approach 2:
The patent introduces oxidants as intermediary substances that facilitate the extraction of lithium from sedimentary deposits by oxidizing iron and other metals, which indirectly releases lithium into the solution phase, simplifying the overall extraction process
2Productivity
If lithium is extracted from sedimentary deposits using conventional methods, then lithium can be recovered, but the process requires complex separation processes and tightly bound lithium
Solution Approach 1:
The patent employs strong oxidants such as potassium permanganate, sodium persulfate, or hydrogen peroxide to accelerate the oxidation of iron and other metals in sedimentary deposits, which releases tightly bound lithium into the solution phase more efficiently, thereby improving recovery rates and reducing separation process complexity
Solution Approach 2:
The patent changes the oxidation state parameters of the lithium-bearing minerals through the addition of oxidants, transforming tightly bound lithium into a more accessible ionic form that can be easily separated from the solid matrix, simplifying the separation process
3Productivity
If acid and oxidant are used to leach lithium from sedimentary ore, then lithium extraction efficiency is improved, but chemical substances are consumed in the process
Solution Approach 1:
The patent implements a recovery system where the spent acid and oxidant solutions are collected, treated to regenerate the chemical substances, and recycled back into the leaching process, thereby reducing chemical substance consumption and waste generation while maintaining high lithium leaching efficiency
Solution Approach 2:
The patent employs feedback mechanisms where the concentration and composition of the acid and oxidant solutions are continuously monitored and adjusted, allowing for optimized chemical usage and maximized lithium recovery while minimizing chemical substance consumption
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 approach enables the efficient extraction of lithium from sedimentary deposits with reduced physicochemical processing, improved selectivity, and the potential for recycling acidic and basic solutions, thereby enhancing lithium recovery rates and reducing the need for external chemical sources.
Implementation Method 1
The oxidant may oxidize iron and/or other metals within the sedimentary ore
Implementation Method 2
dissolving at least a portion of the lithium species into the liquid to form a leachate
Implementation Method 3
flowing the leachate comprising a first species and a second species to an electrodialysis stack, diffusing the first species across a first membrane
Data Source
AI summary
Compositions, systems, and methods for selectively leaching and/or extracting lithium from sedimentary deposits and other resources are generally described.