Challenges and Opportunities in Hydrometallurgical Recovery of Germanium from Coal By-Products

Molecules, Journal Year: 2025, Volume and Issue: 30(8), P. 1695 - 1695

Published: April 10, 2025

Germanium, a critical material for advanced technologies, is enriched in certain coal deposits and by-products, including combustion gasification fly ashes. This review examines germanium concentrations occurrence modes coal, gangue, their or as well hydrometallurgical recovery methods at laboratory, pilot, industrial scales. Fly ashes from both are particularly promising due to higher content rates, which can exceed 90% under optimal conditions. However, the low high levels of impurities leachates pose challenges, necessitating development innovative selective separation techniques, primarily involving solvent extraction, ion exchange, adsorption.

Language: Английский

Application of Supercritical Ethanol for Enhanced Alkaline Leaching of Ge in Lignite

Energy & Fuels, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 17, 2024

As a rare strategic metal, germanium (Ge) is extensively utilized in solar cells, optical fiber communication, semiconductor materials, and other industries. Currently, the enrichment extraction of Ge are mainly through chlorination distillation germanium-rich dust produced from lignite combustion. However, this method presents challenges, such as formation inert Ge-containing solid, high-energy consumption, significant carbon emissions. Therefore, study proposes novel approach for extracting supercritical ethanol activation alkaline leaching. It was shown that after reaction, components activated, rate can be effectively improved low-temperature The theoretical recovery reached 74.6% at temperature 110 °C, leaching time 60 min, solid–liquid ratio 1:12.5, concentration 2 mol/L. Compared with direct lignite, activated using increased 48% to 63%. Meanwhile, mechanism investigated by analyzing changes structure lignite. provides green feasible way efficient

Language: Английский