Study of the content of rare and rare earth elements in ash and slag waste of the Kemerovo state district power plantTatiana Cherkasova, Anastasia Tikhomirova, Elizaveta Cherkasova and Andrey GolovachevE3S Web Conf., 315 (2021) 02004DOI: https://doi.org/10.1051/e3sconf/202131502004