Rare and Rare-Earth Metals in Coal Processing WasteTatiana Cherkasova, Elizaveta Cherkasova, Anastasia Tikhomirova, Alyona Bobrovni-kova and Irina GoryunovaE3S Web Conf., 21 (2017) 02009DOI: https://doi.org/10.1051/e3sconf/20172102009