Background:
The global demand for lithium (Li) has surged due to its critical role in lithium-ion batteries (LIBs) for electric vehicles, renewable energy storage, and consumer electronics. Traditionally, lithium is extracted from brine deposits and hard rock ores, processes dominated by foreign markets such as China, Chile, and Argentina. However, increasing attention is being given to lithium-bearing clays, which offer an abundant alternative source.
Existing extraction methods rely on roasting followed by acid leaching, which is energy-intensive and environmentally harmful. The process requires high-temperature roasting (800°C–1000°C) and strong acids such as sulfuric acid (H₂SO₄), generating significant waste and emissions. Developing an efficient, cost-effective, and environmentally sustainable method for lithium recovery from clay resources remains a major challenge.
Technology:
Researchers at the University of Nevada, Reno have developed a Selective Hydrothermal Extraction (HSE) Process that efficiently extracts lithium from Nevada claystone without roasting or acid leaching. This breakthrough process selectively removes lithium while minimizing the extraction of unwanted impurities such as magnesium (Mg), calcium (Ca), and iron (Fe). The technology utilizes targeted extractants in a controlled hydrothermal environment.
Unlike conventional methods, this process enables the electrodeposition of lithium metal directly from the leached solution. Additionally, the extractants can be recycled, making the process both energy-efficient and environmentally sustainable.
Benefits:
- Eliminates roasting: No need for high-temperature processing, reducing energy consumption.
- Avoids acid leaching: No use of strong acids, preventing hazardous waste generation.
- Highly selective: Extracts lithium with minimal contamination from other metals.
- Energy-efficient: Requires significantly lower power input compared to traditional methods.
- Scalable and cost-effective: Uses readily available reagents, reducing operational costs.
- Environmentally sustainable: Produces no toxic gas emissions, minimal waste, and allows reagent recycling.
Patent Pending
