Obtaining complex fertilizers based on low-grade phosphoritesUktam Temirov, Nodir Doniyarov, Bakhrom Jurakulov, Najimuddin Usanbaev, Ilkhom Tagayev and Abdurasul MamataliyevE3S Web Conf., 264 (2021) 04009DOI: https://doi.org/10.1051/e3sconf/202126404009