Azamat Yessengaziyev, Azamat Toishybek, Arailym Mukangaliyeva, Albina Yersaiynova, Nurgali Abdyldayev. SOLVENT EXTRACTION OF NIOBIUM FROM FLUORIDE-SULFURIC ACID SOLUTIONS OBTAINED BY LEACHING WASTE FROM TITANIUM-MAGNESIUM PRODUCTION. 25th International Multidisciplinary Scientific GeoConference Proceedings SGEM2025, Science and Technologies in Geology, Exploration and Sustainable Mining, 2025, pp. 405-414. https://doi.org/10.5593/sgem2025/1.1/s04.49