Conversion of gypsum to anhydrite in aqueous salt solutions

Details Conversion of gypsum to anhydrite in aqueous salt solutions Conversion of gypsum to anhydrite in aqueous salt solutions

Sep 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28.1363o&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 28, Issue 9, pp.1363-1372

Physics

1

Scientific paper

Gypsum in contact with aqueous salt solutions was converted to natural anhydrite at 90.5°C. The mechanism of the reaction is the conversion of gypsum first to the hemihydrate then to natural anhydrite. Thermodynamic calculations and experimental evidence substantiate the reaction mechanism. It is demonstrated that the previous value of 42°C for the transition temperature of the gypsum-anhydrite system is in error. Gypsum will not be converted to anhydrite in pure calcium sulfate solutions at temperatures less than 97°C.

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