Mineral Composition of Nodular Phosphorite of Karakalpakstan and its Processing into Simple Superphosphate

Abstract

The possibility of simple superphosphate fabricate by sulfuric acid activation of nodular phosphorites of Karakalpakstanwas considered. At the same time, the chemical and mineralogical composition of phosphate raw materials was established using X-ray diffraction. The raw material mainly consists of 27.09% kurskite and 26.19% francolite, as well as quartz. The norm of sulfuric acid for the decomposition of phosphate, including impurity minerals, has been calculated. Under the optimal activation condition (70% H2SO4 of stoichiometry for the formation of monocalcium phosphate), the product was prepared with grades of P2O5free – 1.48%; Р2О5total – 14.67%; Р2О5assim.: Р2О5total = 97.88%; Р2О5water soluble: Р2О5total = 61.35%. CaOtotal – 25.72%; CaOassim.: CaOtotal = 68.12%.