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

• Solubility of K2SiF6 in phosphoric acid and nitric acid solutions was reported as a function of the acidic concentrations.
• Solubility of K2SiF6 in different acidic solutions was measured at three temperatures of 25, 45, and 65 °C.
• Effects of different nitrates on the solubility of K2SiF6 in acidic solutions were also discussed.

In this paper, the solubility values of potassium hexafluorosilicate (K2SiF6) were measured in phosphoric acid, nitric acid and mixed acidic aqueous solutions according to the different acidic concentrations and different temperatures of 25, 45, and 65 °C. The influence of different nitrates on the solubility of K2SiF6 in mixed acidic aqueous solutions was also discussed. The results revealed that the solubility values of K2SiF6 increased with raising temperature, and were declining in phosphoric acid solution but were rising in nitric acid solution. The nitrates in acidic solutions have some influences on the solubility of K2SiF6. These obtained results would provide basic data for the fluorine removal from the production process of nitrophosphate fertilizer.

The solubility values of K2SiF6 increased with raising temperature, and were declining in phosphoric acid solution but were rising in nitric acid solution.Figure optionsDownload as PowerPoint slide