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Why is the hemihydrate gypsum (CaSO4 05H2O) transformed from ,

At temperatures above 200 degree C, the dihydrate phase transforms to anhydrite , in properties from the hemihydrate which results from calcination of dihydr

Patent US2418590 - Process of making anhydrous calcium sulphate ,

In normal commercial calcination, hemihydrate (Casua 1120) is formed at temperatures of 225 to 275 F This is the ordinary plaster of Paris or calcined gypsum.

CaSO4 - Hydro-Land

Temperatures of 170 °C are used in industrial calcination, but at these , mineral is called calcium sulfate hemihydrate or calcined gypsum ("plaster of Paris").

Plaster Process / Gypsum and plaster / Home - Saint gobain formula

Calcination Calcium sulphate hemihydrate (CaSO4½H2O) or plaster is obtained through the partial or total dehydration of gypsum at a temperature ranging.

Behavior of calcium sulfate at high temperatures - NIST Page

follows: (1) the hemihydrate, CaSOd~H20, of which plaster of paris is largely composed; (2) an , At such temperatures the decomposition of CaS04 to CaO and

The system, CaSO 4 -H 2 O

and the sluggishness of reaction in the case of the formation of hemihydrate, , that because the decomposition temperature of hemihydrate found by Le

Making of gypsum plaster in Bhutan – An experience

Paper deals with characterization of gypsum, its calcination to β-hemihydrate plaster, chemistry and , discharging plaster at 165-170°C (usual temperature).

effect of drying temperature on properties of hardened gypsum

Experimental research dealing with the effect of drying temperature on the , temperatures of 110 to 150 °C Then, β-form of hemihydrate (calcined gypsum) is.

THE CRYSTAL FORMS OF CALCIUM SULPHATE L S Rausoor,r ,

were four crystal forms of calcium sulphate: gypsum, hemihydrate, "soluble anhydrite , of gypsum at low temperatures, commonly referred to as "soluble , On the Formation of Anhydrite by the Calcination of Gypsum at a High Tem- perature.

Calcium sulfate - Wikipedia

Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO4 and , Specific hemihydrates are sometimes distinguished: alpha-hemihydrate and beta-hemihydrate , Temperat,

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