Abstract
In view of possible ways of disposal of phosphogypsum the hydration of a series of preparations of calcium sulphoaluminate, made from this by-product at 1000 and 1100° C or from pure gypsum at 1200 and 1350 ° C, has been studied in mixtures with phospho- or pure gypsum and Ca(OH) 2. The compositions of the mixtures to be hydrated were stoichiometric for the formation of calcium tri- and monosulphoaluminate hydrates. The hydration properties of calcium sulphoaluminate are not significantly influenced by the nature of gypsum employed in the high temperature synthesis. Phosphogypsum impurities act as catalysts in the formation of calcium trisulphoaluminate hydrate which is of major interest among the hydration products of a wide range of cements.
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