Lithium Extraction from Spodumene Using Solid Roasting Agent
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lithium extraction methods from spodumene ores require high-temperature roasting, making them energy-intensive and economically inefficient, particularly for the α-spodumene phase, which limits the development of economically viable extraction processes.
Innovation Solution
A method involving heating a lithium-bearing material with a solid roasting agent at temperatures between 100°C to less than 850°C to form a solid composition that is then leached with water, followed by optional acid leaching, to recover lithium without the need for high-temperature calcination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-temperature roasting is used to transform α-spodumene to β-spodumene, then lithium can be extracted from the mineral, but energy consumption increases significantly
Solution Approach 1:
The patent changes the temperature parameter from conventional high-temperature roasting (950-1100°C) to lower temperature processing (below 850°C, preferably 500-700°C), fundamentally altering the thermal conditions required for lithium extraction while maintaining extraction effectiveness
Solution Approach 2:
The patent introduces a roasting agent as an intermediary substance that facilitates the transformation of α-spodumene to a leachable form at lower temperatures. This mediator enables the extraction process to proceed efficiently without requiring extreme temperatures, thus reducing energy consumption while maintaining productivity
2Productivity
If conventional high-temperature roasting is applied to α-spodumene, then lithium extraction is achieved, but the process becomes economically inefficient
Solution Approach 1:
By modifying the temperature parameter to operate below conventional roasting temperatures, the patent reduces operational costs and energy expenses, thereby improving the economic viability of lithium extraction from α-spodumene while maintaining reasonable recovery rates
Solution Approach 2:
The introduction of a roasting agent serves as a catalyst that enables efficient lithium extraction at lower temperatures, reducing the energy input requirements and making the extraction process more economically feasible compared to conventional high-temperature methods
3Productivity
If high-temperature roasting is used for lithium extraction, then lithium can be recovered from α-spodumene, but the process complexity and operational difficulty increase
Solution Approach 1:
The patent simplifies the process by reducing the temperature parameter, which decreases the operational complexity and equipment requirements. Lower temperature processing allows for simpler heating systems and reduced process control challenges while maintaining effective lithium extraction from α-spodumene
Solution Approach 2:
The roasting agent acts as a facilitator that enables lithium extraction to proceed at lower temperatures with simpler equipment and reduced process complexity. This intermediary substance allows the extraction process to be conducted under milder conditions, reducing both device complexity and operational difficulty
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 energy consumption and enhances lithium recovery efficiency, allowing for the extraction of lithium from α-spodumene at lower temperatures and pressures, making the process more economically viable and environmentally friendly.
Implementation Method 1
heating a mixture of a lithium-bearing material provided in a water-insoluble solid form and a solid roasting agent for a first predetermined time to form a solid composition comprising at least one water-soluble phase and at least one water-insoluble phase
Implementation Method 2
suspending the solid composition in a first aliquot of water for a second predetermined time, thereby dissolving the at least one water-soluble phase and forming a first suspension
Data Source
AI summary
Disclosed herein are methods for the recovery of lithium from lithium-bearing materials. More specifically, disclosed herein are methods comprising heating the lithium-bearing material with a solid roasting agent, forming a water suspension to allow to leach at least a portion of lithium into the water, separating a liquid and solid phase, and then exposing the collected solid phase to acid to allow acid leaching of the remaining amount of lithium.