<報文>25-200℃の温度範囲における硫酸塩溶液中の CaSO_4 の溶解度

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Solubilities of calcium sulfate in the acid-free solutions of ZnSO_4,MgSO_4,CuSO_4 and CoSO_4 have been determined over a temperature range of 25 to 200℃. In the case of the solutions of ZnSO_4 and MgSO_4,there is a close similarity in the variation of solubility of calcium sulfate with temperature and the concentration of the sulfate. The solubility steadily increases with temperature and, passing through a maximum at around 100℃, then decreases in the temperature range between 100 and 150℃. Above 150℃, the solubility marginally decreases with a further rise in temperature. An increase in the concentration of the sulfate results in a more pronounced temperature dependence of CaSO_4 solubility. In the solutions of CuSO_4 and CoSO_4,the solubility is less temperature-dependent in comparison with the other sulfate solutions particularly over a lower temperature range. The solid calcium sulfate phase in equilibrium with the sulfate solutions was dihydrate, hemihydrate and anhydrite in the temperature ranges of 25 to 100℃, 100 to 150℃ and above 150℃, respectively.gypsumcalcium sulfatesolubilitysulfate solutionhigh temperature
東北大学の論文
1989-09-30