高温における2, 3の金属硫酸塩の水への溶解度
高温水溶液に関する基礎的研究 (第1報)
1971 年 87 巻 998 号 p. 329-334
詳細
1971 年 87 巻 998 号 p. 329-334
The solubilities of cadmium, zinc, nickel and cobalt sulfates have been measured in the temperature range 100°C to 300°C, by a direct sampling method using a zirconium autoclave. The obtained results are as follows;(1) The solubilities of these sulfates at above 100°C decrease sharply with increasing temperture, and show just slight value at 200°C to 300°C.
(2) The forms of equilibrating solid phases within a temperature range investigated were confirmed to be CdSO4, ZnSO4·H2O, NiSO4·H2O (above 140°C) and CoSO4·H2O, respectively.
(3) The solubility of cadmium sulfate obtained shows good agreement with previous data and was first established by the present work at above 190°C.
(4) The obtained solubility of zinc sulfate at above 120°C shows somewhat different tendency from the previous data, and the solubility at above 250°C was newly established.
(5) The solubility data for nickel and cobalt sulfates agree well with those obtained by Gesell et al., whose data were limited at above 160°C. The data below 160°C were also established, but the form of equilibrating solid nickel sulfate below 140°C could not be comfirmed experimentally.
(6) Some thermodynamic considerations were carried out using the data obtained for nickel and cobalt sulfates.
