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Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO 4 and related hydrates. In the form of γ- anhydrite (the anhydrous form), it is used as a desiccant . One particular hydrate is better known as plaster of Paris, and another occurs naturally as the mineral gypsum .

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Abstract. Lime pretreated phosphogypsum(PG) was calcined at 500 °C to produce anhydrate gypsum cement. Due to the slow hydration of anhydrate gypsum, additives, K 2 SO 4 and hemihydrate gypsum were selected to accelerate the hydration of anhydrate. The hydration characteristics, the resistance to hydrodynamic water, and the mineralogical studies were investigated.

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Nov 21, 2008· I want to know about chemistry process to produce gypsum hemihydrate ( CaSO4. 1/2 H2O ) and what should be controlled in the process to get stable CaSO4.1/2H2O: a. Temperature b. Moisture c. Pressure d. Air/powder ratio e. Any others parameter that needed

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The calcined gypsum (or hemihydrate) CaSO 4 •½H 2 O is then used as the base for gypsum plaster, gypsum board and other gypsum products. Synthetic gypsum, commonly known as the FGD (Flue Gas Desulphurization) gypsum or DSG (desulphurised) gypsum may also be used in the production of gypsum …

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Our hydrated form of calcium sulfate is a white, odorless powder also know as gypsum. When heated, this hydrated form loses water and forms hemidydrate, commonly known as Plaster of Paris. Multiple uses include as a white paint pigment, soil conditioner, a lab and commercial drying agent and more.

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Gypsum, or calcium sulfate (CaSO4), is a naturally occurring mineral. It provides calcium & sulfur, both essential nutrients, but does not affect soil pH. It is a neutral salt (pH is ~6.7) & has a salt index, or osmotic potential, of 8.

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The hydration of calcium sulphate hemihydrate (CaSO 4 ·0.5H 2 O) leading to the crystallization of gypsum (calcium sulphate dihydrate – CaSO 4 ·2H 2 O) has been the subject of several investigations over a long period and a vast amount of data is widely distributed throughout in the literature. In this review article an overall picture of the subject is presented.


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What is Gypsum? - Gypsum Association

Gypsum rock is mined or quarried, crushed and ground into a fine powder. In a process called calcining, the powder is heating to approximately 350 degrees F, driving off three fourths of the chemically combined water. The calcined gypsum, or hemihydrate, becomes the base for gypsum plaster, gypsum board and other gypsum products.

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