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Selective extraction of potassium from raw nepheline materials
Nazym Akhmadiyeva1, Sergey Gladyshev1, Rinat Abdulvaliyev1
1Institute of Metallurgy and Ore Beneficiation, Satbayev University, Almaty, Kazakhstan.
Heliyon
|April 22, 2024
Summary
Researchers explored extracting potassium from nepheline, an alternative to bauxite for aluminium production. Optimal conditions achieved 93.91% potassium extraction, enhancing economic viability for valuable mineral processing.
Area of Science:
- Mineral Processing
- Hydrometallurgy
- Geochemistry
Background:
- The global aluminium industry faces challenges due to finite bauxite reserves, necessitating alternative alumina sources.
- Nepheline minerals are identified as promising alternatives, offering co-production of valuable materials like potash, soda, cement, and rare metals.
- Comprehensive processing of nepheline syenites requires efficient separation of valuable components.
Purpose of the Study:
- To determine optimal conditions for selective potassium extraction from alkaline leaching solutions.
- To separate potassium from sodium alkali, aluminium, and silicon during nepheline syenite processing.
- To enhance the economic viability of nepheline processing by improving aluminium extraction efficiency.
Main Methods:
- A two-stage hydrothermal leaching process was employed.
- Incremental calcium addition was utilized during the leaching stages.
- Potassium sulfate was produced from the resulting leaching solution via crystallization.
Main Results:
- Optimal conditions yielded a potassium extraction rate of 93.91% in the alkaline solution.
- Selective potassium separation was achieved, minimizing its interference with aluminium extraction.
- The process facilitated the production of potassium sulfate, a marketable co-product.
Conclusions:
- Selective potassium extraction is crucial for efficient and economically viable processing of nepheline syenites.
- The developed hydrothermal leaching method effectively separates potassium, improving overall resource utilization.
- This approach supports the development of alternative raw materials for the aluminium industry and valuable co-product generation.
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