Gypsum Crystallization in the Presence of Cr3+ and Citric Acid
- 28 April 2010
- journal article
- research article
- Published by Wiley in Chemical Engineering & Technology
- Vol. 33 (5) , 804-811
Abstract
Reactive crystallization of calcium sulfate dihydrate (gypsum) was investigated at pH 3.5 and 65 °C in the presence of citric acid and Cr3+ ions. Concentrations of both additives varied between 0 and 4000 ppm. The combined effect of additives on crystal size distributions, filtration characteristics, and crystal morphology were investigated and discussed. It was found that the effect of citric acid on gypsum morphology was suppressed in the presence of Cr3+ ions. The change of morphology is related to the complex formation between Cr3+ ions and citric acid at high ion concentrations.Keywords
This publication has 13 references indexed in Scilit:
- Influence of citric acid on calcium sulfate dihydrate crystallization in aqueous mediaCrystal Research and Technology, 2007
- Crystallization of calcium sulfate dihydrate under simulated conditions of phosphoric acid production in the presence of aluminum and magnesium ionsJournal of Crystal Growth, 2004
- Crystallization of calcium sulfate dihydrate at different supersaturation ratios and different free sulfate concentrationsCrystal Research and Technology, 2004
- Kinetics of gypsum formation and growth during the dissolution of colemanite in sulfuric acidJournal of Crystal Growth, 2001
- Investigation of the initial period of sulphate scale formation Part 2. Kinetics of calcium sulphate crystal growth at its crystallization on a heat-exchange surfaceDesalination, 2000
- Crystallization of gypsum from hemihydrate in presence of additivesJournal of Crystal Growth, 1999
- Kinetics of calcium sulfate formation in aqueous media: effect of organophosphorus compoundsJournal of Crystal Growth, 1998
- Gypsum growth in the presence of growth inhibitors: a scanning force microscopy studyChemical Geology, 1996
- Crystal structure and EPR spectrum of bispyridinium bis(citrato)chromium(III) tetrahydratePolyhedron, 1992
- Calcium Sulfate Scale Formation: A Kinetic ApproachSociety of Petroleum Engineers Journal, 1978