The Role of Medium Condition for Uranium Separation from Central Kyzylkum’s Low-grade Phosphorite after Sulfuric Acid Treatment

Abstract

This article presents the results of separating radioactive elements, particularly uranium, from low-grade phosphorites of the Central Kyzylkum by low concentrated sulfuric acid solution, which is practically feasible at the Kyzylkum phosphorite combine (KPC). In world practice, uranium was extracted from phosphorite ore in the countries of the Middle East (Syria, Morocco, Algeria, Egypt) at the final stages of obtaining phosphorus fertilizers at metallurgical and chemical plants. The extraction of uranium from phosphorite ore is not practiced in Uzbekistan. The proposed method is fundamentally different from the above and is recommended to be applied at the initial stage of enrichment phosphorite ores in the enrichment plants. Studies have shown that the uranium completely passed into solution by treating phosphorite ore with weak concentrated sulfuric acid solution. Analyses of solution and sediment composition showed that the useful component, P2O5, remained in the sediment, increasing from 8.69% to 10.3%, while uranium passed into the solution with alkaline salts alkaline-earth elements. To obtain a finished product, the resulting enriched solution was added to the richer phosphorite ore. When performing the above processes, the pH of the medium was kept at the neutral level, which is of great practical importance for the implementation of this method with minimal economic costs using conventional inventory, corrosion resistance, and environmentally friendly phosphorus fertilizer.

Analysis of the mineralogical composition of soil samples: Case study of Karmana district

“…Based on the results of infrared spectroscopy, it is possible to develop a chemically reliable, reproducible, and standardizable method for analyzing various systems [11][12][13][14][15][16]. The study of the IR spectra of soil samples from the Karmaninsky district (Khazora) of the Navoi region showed (Fig.…”

Processing of phosphorites and additives with researching their thermodynamical properties

“…Alkaline decomposition of phosphates is characterized by the simplicity of the technological process and allows avoiding the consumption of acids necessary for other methods of obtaining phosphorus fertilizers, as well as the use of low-quality raw materials without enrichment, which contain relatively little P2O5 and important mixtures of R2O3 [14]. Based on the above-mentioned problems, scientific studies on the production of thermophosphate fertilizers were carried out based on the thermo-alkaline activation of the Central Kyzylkum waste phosphorite mineralized mass in the presence of alkaline salts [15][16][17].…”