2. Gypsum dehydration products
The manufacture of plaster is based on a relatively simple principle: the total or partial elimination of water from the gypsum. In practice, however, this operation has complex implications, involving crystallization phenomena that are difficult to control.
When subjected to heat, gypsum leads to a series of partially hydrated or anhydrous products. At around 100 C, the α or β semi-hydrates are obtained (depending on whether they are produced under steam pressure or in the open air, respectively) according to the reaction :
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Gypsum dehydration products
Hydration and intake
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Gypsum around the world
The United States Bureau of Mines (USBM) estimates global gypsum reserves at 2,300 million tonnes. However, not all existing deposits have been identified, and potential resources are certainly higher.
The United States and Canada have the largest identified reserves, estimated at 730 and 450 million tonnes respectively. Europe has around 800 million tonnes of reserves...
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