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An Experimental Study of $${\text{ZrF}}_{6}^{{2 - }}$$ Stability in Hydrothermal Solutions at 90–255°C
Moscow University Geology Bulletin ( IF 0.3 ) Pub Date : 2020-05-15 , DOI: 10.3103/s0145875220010147
M. E. Tarnopolskaia , A. Yu. Bychkov

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。
更新日期:2020-05-15
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