Effects of acidic concentrations, temperatures and nitrates on the solubility of K2SiF6 in phosphoric acid and nitric acid solutions

Removal of Iron(III) and Aluminum Ions from Phosphoric Acid–Nitric Acid Solutions by S957 Chelation Resin: Kinetics, Dynamic Adsorption, and Elution

“…3 Nevertheless, there still exist the metal ion impurities of Fe(III), Al(III), Ca(II), and Mg(II) ions in the neutralization mother liquor (major ingredients: PA and NA). These ions can react with PA and ammonia gas and form a large amount of gel-like substances in the neutralization section, 4,5 which makes the neutralization process very difficult and degenerates the soluble fertilizer. Therefore, it is necessary to remove these impurities from the neutralization mother liquor for the production of the NP fertilizer.…”

Dissolution Behavior and Kinetics of the Phosphorus–Potassium Associated Ore during Phosphoric Acid Leaching

“…Liquid film diffusion control (6) Solid film diffusion control (7) Surface chemical reaction control (8) where k is reaction rate constant (s −1 ), and t is the reaction time(s), whose temperature dependence is determined by the Arrhenius equation…”

“… Potassium fluorosilicate precipitates rapidly in the vacuum filtration system, owing to the decrease in temperature, causing extensive scaling in process equipment and reducing the effective operating lifetime . Therefore, the traditional wet phosphoric acid process is not suitable for the utilization of the phosphorus–potassium associated ore normalC normala 5 ( P O 4 ) 3 normalF + 5 normalH 2 normalS normalO 4 + 5 normalH 2 normalO = 5 normalC normala normalS normalO 4 • 2 normalH 2 normalO + normalH normalF + 3 normalH 3 normalP normalO 4 2 normalK normalA normall normalS normali 3 normalO 8 + 32 normalH normalF = normalK 2 normalS normali normalF 6 + 2 normalA normall normalF 3 + 16 normalH 2 normalO + 5 normalS normali normalF 4 …”

“… Potassium fluorosilicate precipitates rapidly in the vacuum filtration system, owing to the decrease in temperature, causing extensive scaling in process equipment and reducing the effective operating lifetime . Therefore, the traditional wet phosphoric acid process is not suitable for the utilization of the phosphorus–potassium associated ore …”

“…6 Potassium fluorosilicate precipitates rapidly in the vacuum filtration system, owing to the decrease in temperature, causing extensive scaling in process equipment and reducing the effective operating lifetime. 7 Therefore, the traditional wet phosphoric acid process is not suitable for the utilization of the phosphorus−potassium associated ore. 8 (1) (2) The phosphorus−potassium associated ore remains a significant potential source of phosphorus and potassium with favorable utilization prospects; numerous studies have been conducted on such utilization processes. Lüused calcium sulfate and calcium carbonate as additives to roast the phosphorus−potassium associated ore at 1100 °C, and the roasting product was subsequently leached by sulfuric acid with phosphorus and potassium leaching rates of 95 and 90%, 9 respectively.…”