The crystal growth of calcium sulfate dihydrate in the presence of additives

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Abstract

The kinetics of crystallization of calcium sulfate dihydrate seed crystals in supersaturated solution has been studied at 25°C in the presence of a variety of additives. Substances such as sodium benzoate, EDTA, cetyltrimethylammonium bromide, which inhibit the growth of other sparingly soluble salts are almost without effect whereas ENTMP, [N,N,N′,N′-ethylenediaminetetra (methylene phosphonic acid)] and TENTMP [N,N,N′,N′-triethylenediaminetetra (methylene phosphonic acid)] markedly retard the rate of crystallization. The effect of added gelatin upon the rate constant for crystal growth can be interpreted in terms of its adsorption, following the Langmuir isotherm at the available crystal growth sites. Microscopic evidence indicates that some of the more effective phosphonate additives also modify the crystal habit of the calcium sulfate.

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