Clay Mineral Lithium Extraction via Cation Milling and Leaching
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Solution Overview
Problem
Existing methods for extracting lithium from clay minerals are inefficient and environmentally unfriendly due to high lithium loss, impurity extraction, and high acid consumption, making the process costly and unsustainable.
Innovation Solution
A method involving a high-energy mill of clay minerals with a cation source, followed by a solvent leach, to achieve selective lithium extraction while minimizing impurity extraction, using cations such as NaCl or MgCl2 to facilitate ion-exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If acid leaching is used to extract lithium from clay minerals, then lithium extraction is achieved, but high concentrations of impurities including Na, K, Fe, Al, Ca, and Mg are also leached out
Solution Approach 1:
The extraction process is segmented into multiple stages: initial acid leaching followed by selective precipitation stages. This allows lithium to be extracted first, then impurities are removed in subsequent controlled stages, preventing co-extraction of unwanted elements
Solution Approach 2:
The patent employs parameter changes by adjusting pH levels, temperature, and reagent concentrations at different process stages. By controlling these parameters sequentially, the process achieves selective lithium extraction while leaving impurities in the solid phase or removing them in controlled manner
2Quantity of substance
If acid leaching is used to extract lithium from clay minerals, then lithium is obtained, but high lithium loss occurs during subsequent impurity removal
Solution Approach 1:
The patent performs preliminary classification and filtration of the leach solution before impurity removal steps. This preliminary action separates lithium-rich solution from solid impurities early in the process, minimizing lithium loss during subsequent purification operations
Solution Approach 2:
The patent uses intermediary substances such as selective precipitants and flocculants that facilitate impurity removal without causing lithium precipitation. These intermediaries enable selective impurity removal while keeping lithium in solution
3Quantity of substance
If acid leaching is used to extract lithium from clay minerals, then lithium extraction is achieved, but high acid consumption and complicated purification methods are required
Solution Approach 1:
The patent extracts and removes the acid from the process by using alternative extraction methods such as solvent extraction or ion exchange resins. This eliminates the need for complex neutralization and purification steps required by traditional acid leaching
Solution Approach 2:
The patent employs disposable or easily regenerable materials such as single-use extraction resins or consumable reagents that simplify the purification process. These materials perform the purification function in one step without requiring complex equipment or multi-stage processes
4Quantity of substance
If acid leaching is used to extract lithium from clay minerals, then lithium is extracted, but the process is not environmentally friendly
Solution Approach 1:
The patent converts potentially harmful acid waste streams into beneficial products by using the acid solution for secondary applications or by neutralizing it to produce useful salts. This eliminates environmental harm while maintaining extraction efficiency
Solution Approach 2:
The patent replaces reactive acid environments with inert or environmentally benign alternatives such as carbonate-based extraction systems or biological leaching methods. This creates a safer, more environmentally friendly process while achieving the same extraction goal
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 extraction efficiencies of at least 50% with reduced impurity levels, particularly aluminum and iron, and avoids the use of strong acids, resulting in a more efficient and environmentally friendly extraction process.
Implementation Method 1
performing a high-energy mill of the clay mineral
Implementation Method 2
using cations such as NaCl or MgCl2 to facilitate ion-exchange
Implementation Method 3
contacting the milled clay material and cation source mixture with a solvent to extract lithium from the milled clay material and form a lithium rich leach solution
Data Source
AI summary
Processes for extracting lithium from a clay mineral and compositions thereof are described. The extraction process includes providing a clay mineral comprising lithium, mixing a cation source with the clay mineral, performing a high-energy mill of the clay mineral, and performing a liquid leach to obtain a lithium rich leach solution.