Setting of "Sengo-gypsum"

概要

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The properties of the byproduct gypsum, - "Sengo-gypsum" -which is yielded by concentrating the sea-water or brine at the salt-making plant, were studied on the stand point of view to use as the raw material of calcined gypsum. In this object the sample were then examined by differential thermal analysis, thermo-gravimetric analysis, X-ray analysis and setting. In this paper we were reported the result as follows ; 1. The setting of this byproduct gypsum was slower as that of the natural gypsum, because of the impurities such as the oil contaminated mechanically in the multiple effect evaporators and the ocean soluble or double salts due to the components in the sea water. 2. The setting time was normalized by the operations as follows : (1) Washing the raw "Sengo-gypsum" by the petroleum-ether and removing the oil. (2) Calcinating the raw "Sengo-gypsum" up to the temperature 200°C and burning the oil off. (3) Boiling the raw "Sengo gypsum" in the 2% HCl solution for 1hr, resolving the soluble inorganic salts, destroying the double salts, etc. and removing the oil. 3. In the "Sengo-gypsum, " same hydrated salts but crystal gypsum were detected in the D. T. A.
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