Shermatov, A., & Sherkuziyev, D. (2026). OPTIMIZATION OF ACID DECOMPOSITION OF WASHED CALCINED PHOSPHOCONCENTRATE USING A MIXED SECONDARY SULFURIC–EXTRACTION PHOSPHORIC ACID SYSTEM: CHEMICAL AND FTIR INVESTIGATION. Scientific and Technical Journal of Namangan Institute of Engineering and Technology, 11(1), 195–201. https://doi.org/10.61151/stjniet.v11i1.999