Dissolution and Conversions of Gypsum and
·The difference in solubility between gypsum and calcite decreases to 10 30 times if the latter is dissolved in the presence of CO 2 The dependence of the solubility of gypsum on temperature is
The study on the effect of flotation purification on the performance
·The currently commonly used PG pretreatment methods can partially solve the impurity problem such as using high temperature calcination to obtain hemihydrate or anhydrous gypsum for use as cement
Gypsum vs Plaster of Paris What s the Difference
·Anhydrite CaSO 4 and gypsum CaSO 4 ·2H 2 O are the two most abundant minerals of ancient marine evaporite deposits and are also common in non marine evaporite deposits Sedimentary gypsum forms by direct precipitation out of evaporating seawater under arid climatic conditions in hydrologically restricted marine and marginal marine environments
Dehydration Pathways of Gypsum and the Rehydration
·The dehydration products of gypsum under different temperature and water vapor pressure were investigated by thermodynamic theory Additionally the rehydration mechanism of soluble anhydrite was also studied by Monte Carlo MC simulations The thermodynamic calculation results reveal that the dehydration mechanism of gypsum
Mechanism and kinetics of gypsum anhydrite
·Calcium sulfate can be precipitated as dihydrate DH or gypsum CaSO 4 ·2H 2 O at low temperatures and as hemihydrate HH CaSO 4 · 2 O or anhydrite AH CaSO 4 at elevated temperatures Li and Demopoulos 2005 All calcium sulfate hydrates are relatively insoluble and they are formed wherever calcium and sulfate occur together after the
Gypsum vs Anhydrite — What s the Difference
·Gypsum is a hydrated calcium sulfate mineral used in construction and agriculture while anhydrite is its dehydrated form harder and used in cement Difference Between Gypsum and Anhydrite Table of Contents Anhydrite or anhydrous calcium sulfate is a mineral with the chemical formula CaSO4 It is in the orthorhombic crystal system
Influence of calcination and GGBS addition in preparing β hemihydrate
·Hemihydrate gypsum is found in two forms α hemihydrate gypsum α CaSO 4 ⋅ 2 O and β hemihydrate gypsum β CaSO 4 ⋅ 2 O [8] The α hemihydrate gypsum is produced by the autoclaving and salt solution method whereas β hemihydrate gypsum is obtained through calcination at temperature lower than 200 °C
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