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Calcium sulfate hemihydrate (commercially known as gypsum or plaster) is obtained through partial dehydration of the gypsum crude ore. Depending on the thermodynamic conditions of calcination of the ore, different variations of the hemihydrate can be obtained. The aim of this work is to carry out an investigative study on the possibilities of noble applications for α-type calcium sulfate hemihydrate. For this, a sample of α plaster from state of Pernambuco, in Brazil, was analyzed using structural and chemical characterization techniques. According to the results, the sample presented a composition mainly based on calcium sulfate associated with water, with a purity content equal to 98.79%. The particles had an average size, approximately uniform, around 60 μm. The insignificant concentration of contaminants detected in the sample indicates that the α plaster sample analyzed can be considered suitable for noble applications such as, in the health area, among other applications that imply literal contact with living organisms.

Investigative study of the potentialities of noble applications for the Brazilian calcium sulfate α-hemihydrate