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Gypsum is a monoclinic system with a high degree of cleavage, which is easy to crack into thin slices. The gypsum is heated to 100-200 ° C, and part of the crystal water is lost to obtain hemi-hydrated gypsum. It is a gas-hardening gelling material with both alpha and beta forms, all of which are rhombohedral, but with different physical properties. The α-type hemihydrate gypsum crystallizes well and is solid; the β-type hemihydrate gypsum is a plate-like and cracked crystal, the crystal is very fine, and the specific surface area is much larger than that of the α-type hemihydrate gypsum.
When producing gypsum products, α-type hemihydrate gypsum requires less water than β-type, and the product has higher density and strength. Usually, it is made by steaming autoclave in a saturated steam medium, which is α-type hemihydrate gypsum, also called high-strength gypsum. It is made of β-type hemihydrate gypsum by using a wok or rotary kiln open device. plaster. Industrial by-product chemical gypsum has the same properties as natural gypsum and does not require excessive processing. The slurry of semi-hydrated gypsum and water is re-formed into dihydrate gypsum, which is rapidly coagulated and hardened during the drying process to obtain strength, but softens when exposed to water.
Gypsum is the main raw material for the production of gypsum cementitious materials and gypsum construction products, and also a retarder for Portland cement. After the gypsum is calcined at 600-800 ° C, a small amount of lime and other catalysts are added to grind together to obtain an anhydrite cement (also known as Jin's cement); after calcination at 900-1000 ° C and grinding, high-temperature calcined gypsum can be obtained. . The products made of these two kinds of gypsum have higher strength than the construction gypsum products, and the anhydrite cement has better heat insulation, and the high temperature calcined gypsum has better wear resistance and water resistance.
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