Abstract—The solubility of fluorite in HCl and HF solutions with a variable concentration of Zr at 90, 155, 205, and 255°C and the pressure of saturated water vapor is investigated. It is shown that the solubility of fluorite increases with zirconium concentration. The free energies of the \({\text{ZrF}}_{6}^{{2 - }}\) complex determined from the experimental data using OptimA software were used to calculate the dissociation constants of the \({\text{ZrF}}_{6}^{{2 - }}\) = Zr⁴⁺ + 6F^– reaction. The pK values were 29.86 ± 0.13, 34.03 ± 0.062, 38.28 ± 0.033, 40.94 ± 0.079 at 90, 155, 205, and 255°C (saturated water vapor pressure).

中文翻译：

---

$$ {\ text {ZrF}} _ {6} ^ {{2-}} $$在90–255°C水热溶液中的稳定性的实验研究

摘要—研究了​​在90、155、205和255°C下Zr浓度可变的萤石在HCl和HF溶液中的溶解度以及饱和水蒸气的压力。结果表明，萤石的溶解度随锆浓度的增加而增加。使用OptimA软件根据实验数据确定的\（{{text {ZrF}} _ {6} ^ {{2-}} \}络合物的自由能用于计算\（{\ text {ZrF}} _ {6} ^ {{2-}} \） = Zr ⁴⁺ + 6F ^–反应。在90、155、205和255°C（饱和水蒸气压）下，pK值分别为29.86±0.13、34.03±0.062、38.28±0.033、40.94±0.079。