April, 1956
HYDROTHERMAL REACTION OF CALCIUM HYDROXIDE AND AMORPHOUS SILICA
equation 2 can be established for a system, then this equation would be used to approximate the net energy of adsorption of the solute, Nl(E,I - El). Values of the net energy of adsorption in conjunction with isotherm data from solution at the same temperature are sufficient to calculate the integral heat of adsorption, isosteric heat of adsorption and
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other thermodynamic functions which are important in interpreting the behavior of the solute. For viscous or solid solutes these thermodynamic functions cannot be directly determined. Achowledgment.-The authors gratefully acknowledge the financial support of the Armstrong Cork Company, Lancaster, Penna.
HYDROTHERMAL REACTIONS BETWEEN CALCIUM HYDROXIDE AND AMORPHOUS SILICA BY GUNNAR 0. ASSARSSON AND ERIKRYDBERG Chemical Laboratory of the Geological Survey of Sweden, Stockholm 60, Sweden Received Auouat 91, 1966
The hydrothermal reactions between calcium hydroxide and amorphous silica were studied under carefully controlled experimental conditions within the time and temperature range of 2-48 hours and 120-220'. Reactions of two types take place, depending on the temperature, the boundary between them lying at 160-180'. The formation of the low tem rature products (
