Calcium Sulfate → Calcium Sulfate, Hemihydrate

Participants

Reaction Steps

During the reaction, more water, in addition to what is needed for solification, is needed for stirring thoroughly reactants. The more water adds into, the much time of solification needs. After the reaction completes, excess of water still remained inside the structure of calcium sulfate distills into vapors and voids form accordingly. Therefore, the more water adds in, the weaker of the structural strength of calcium sulfate becomes. Calcium sulfate hemihydrate is obtained by dehydrating calcium sulfate dihydrate by heat. Calcium sulfate hemihydrate with inherent humidity-absorbance can be used to control the crystallization of calcium sulfate dihydrate reduced from calcium sulfate hemihydrate to get stronger products. Calcium sulfate hemihydrate can be divided into a, (3 types of hemi-calcium sulfates according to its physical properties.

Provenance & Evidence