Production of bentonite and humus natural organic substances from fluoride compounds Bakhron Boynazarov, Tolib Berdiyev, Uktam Temirov, Pirnazar Ganiev and Najimuddin Usanbaev E3S Web Conf., 377 (2023) 03012 Published online: 03 April 2023 DOI: 10.1051/e3sconf/202337703012