The deficiency and growing price of phosphate fertilizers are becoming a major problem in Russia. Most of more than 200 proved phosphorite deposits have enough recourse to exploit them but processing the ore from these deposits presents severe difficulties, and it can’t be effectively implemented at this moment. The result of the decomposition process heavily depends on the origin of the ore, their chemical and mineralogical composition and other factors. Three types of phosphorites (carbonated, siliceous, and argillaceous) can be distinguished, and these types of phosphorites behave differently during the acidic decomposition, which leads to the differences in the conditions and performances in the process of their treatment. Phosphorite from Polpino deposit can be considered poor with total component content P2O5≈15.3%, and by the level of SiO2 it can be qualified as siliceous type. The stock from this deposit is highly reactive because of the carbonated additions and its mineral structure. The aim of the research is to study the dynamics of particle shape and size change during the acidic decomposition of a representative quartered sample of Polpino phosphorite. The decomposition was performed using nitric acid with temporary inhibition of the reaction at 0, 10, 30, 60, 300, 600 seconds by neutralization of acid with potassium hydroxide. Solid phase behavior was investigated using microscopic analysis (scanning electronic microscopy) with multi-purpose module microscope JEOL JSM-6510, and then obtained micrographs were edited with special software. Analysis of the behavior of the particles shows that their total number was nearly constant for each experiment, and the number of particles for every fraction almost didn’t change in time. This leads to assumption that the phosphate component in phosphorite from Polpino deposit is located inside of the porous alpha-quartz. It was determined that alpha-quartz from the phosphorite forms a matrix structure and doesn’t undergo changes, and its pore size doesn’t prevent acidic extraction of calcium and phosphate from the inner volume.Forcitation:Pochitalkina I.A., Kondakov D.F., Syromyatnikov A.S., Makaev S.V. Investigation of solid phase behavior during process of acidic decomposition of polpino phosphorite. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 10. P. 47-52
Application of Magnetic and Ultrasonic Methods for Determining Parameters of Ferromagnetic Components in Iron Ore Slurry Flows
