Dependence of kinetics of copper sulfate pentahydrate dehydration on water vapor pressure |
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| Authors: | NZ Lyakhov AP Chupakhin VP Isupov VV Boldyrev |
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| Institution: | Institute of Physico-Chemical Principles of Processing of Mineral Raw Materials, Siberian Division of the USSR Academy of Sciences, Novosibirsk, 630091, Derzhavina, 18, USSR |
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| Abstract: | The dependence of the growth rate vg of nuclei during CuSO4·5H2O dehydration upon water vapor pressure PH2O has been investigated. At small PH2O (less than 1 Torr at 50°C), vg falls rapidly with decreasing PH2O, and simultaneously vg anisotropy disappears. At PH2O = 1–9 Torr, vg for elliptic and round nuclei is constant and independent of PH2O. The influence of initially keeping the samples in water vapor upon the kinetics of the following dehydration has been studied. Treatment by water vapor leads to slowing of dehydration and increasing its degree of transformation. On the basis of data obtained a kinetic interpretation of the Topley-Smith effect has been proposed. |
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