Obtaining ammonium sulfate and calcium carbonate by processing natural gypsum and phosphogypsumJamshid Kholmurodov, Uktam Temirov, Shafoat Namazov and Ruzmat RadjabovE3S Web Conf., 563 (2024) 02038DOI: https://doi.org/10.1051/e3sconf/202456302038