Enriched Superphosphate Based on Decomposition of Ordinary Phosphorite Powder with Phosphoric Acid Gypsum Slurry

Abstract

Complex, nitrogen-phosphate fertilisers are applied before seeding, with seeding and extra nutrition, while single phosphoric ones are the most effective under autumn ploughing. In that case, enriched superphosphate, more concentrated than single superphosphate, was obtained using phosphoric acid gypsum slurry semiproduct produced by the interaction of thermo concentrate with sulphuric acid and recycled phosphoric acid in accordingly dihydrate operation (60-80°C). However, the mix of sulphuric and phosphoric acids was not used those are usually applied in conventional ways for enriched superphosphate production. Phosphate raw material (PRM) is dosed into phosphoric acid gypsum slurry (PAGS) upon weight ratio of PAGS: PRM equal from 100: 15 to 100: 40 that provides a condition for slurry fluidity. Interaction of the components was Original Research Article

Obtaining ammophosphate and sulfoammophosphate fertilizers on base of the washed dry concentrate containing 26% P2O5

“…Earlier, in [13][14][15][16][17][18], the process of obtaining ammophosphate fertilizers based on the decomposition of various types of Kyzylkum phosphorites by wet process phosphoric acid (WPA with a concentration of 21.45% P2O5) was studied. It has been established that an increase in the weight fraction of phosphate raw materials from 5 to 30 g in relation to 100 g of WPA leads to a decrease in its decomposition coefficient (Cd.c.)…”

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

“…However, its volume in physical terms does not exceed 100 thousand tons per year. Some studies were conducted on preparation of phosphate fertilizers (ammophosphate, complexed fertilizers) based on wet phosphoric acid and phosphorite powder of Kyzylkum deposit [3,4].…”