As Gypsum Powder Production Line Supplier, we will introduce the low temperature slow calcination in the desulfurization gypsum calcination process today, and I hope to help you!
Low-temperature slow calcination means that the material stays in the calcining equipment for a long time, the feeding time is at least several tens of minutes, the surface temperature of the gypsum particles is in a lower state, and the temperature inside and outside the particles is relatively close, such as a wok, an indirect rotary kiln. Indirect boiling furnaces are low temperature slow calcining equipment.
These calcination methods (equipment) use a built-in heating tube to receive heat between the desulfurized gypsum, and the heat source generally uses steam, heat transfer oil or hot flue gas. Because it is indirect heating, the heat transfer rate between the material and the heat source is slow. After the gypsum is slowly heated and heated, the water is slowly dehydrated to form a hemihydrate gypsum. The advantage of low-temperature slow calcination is that the product quality is uniform and stable. Due to low-temperature calcination, most of the calcined products are hemihydrate gypsum HH (about 88%), a very small amount of anhydrite AIII (about 2%) and dihydrate. Gypsum DH (less than 1%), crystal water content is 5.5% to 6.0%, so the building gypsum powder produced by low-temperature slow calcination is stable in quality, stable in phase composition, slow in coagulation, and low in standard consistency.
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