Calcium sulfate crystals are an inorganic substance with the chemical formula CaSO4.2H2O， White monoclinic crystal or crystalline powder. No odor. Has hygroscopicity. One molecule of crystal water is lost at 128 ℃, and all water is lost at 163 ℃. Slightly soluble in acidsodium thiosulfateandammonium saltSolution, soluble in 400 parts of water, dissolves less in hot water and dissolves very slowlyglycerolInsoluble in ethanol and mostorganic solventThe relative density is 2.32. It is stimulating. Usually contains 2crystal waterIt exists in the form of gypsum ore in nature.

The calcium sulfate rotary roasting kiln series is an energy-saving kiln developed and manufactured by Changzhou Ganlin Dry on the basis of atmosphere protection kiln. The furnace temperature control is uniform, the long-term operation has a low failure rate, a long service life, and is stable and reliable. Inert gas protection, oxygen content in the furnace ≤ 20ppm. Suitable for roasting calcium powder.

During the roasting process, the rotary cylinder has a small inclination, and the material continuously moves from the feed end to the discharge end in the kiln. Kilns generally operate continuously and fully automatically. They can directly transport materials without the need for further conveying equipment, making these kilns more energy-efficient. Due to the significant mechanical impact of the rotary kiln roasting process on materials, it is necessary to specifically design a rotary kiln for the materials it processes. In the design and engineering of pyrolysis equipment, it is necessary to consider the characterization parameters of materials, including flow characteristics, flowability, bulk density, moisture content, and process temperature. For different materials, the inclination of the rotary cylinder along its length, the rotation speed of the rotary cylinder, and the additional components welded to the cylinder must be designed accordingly. In the ceramic, glass, and binder industries, rotary kilns are now used for heat treatment of powders, granules, blocks, and dry or wet mixtures. The main uses include drying, desorption, preheating, calcination, foaming, sintering, etc. On this basis, combined with typical applications under different atmospheres, according to the key production process differences of rotary roasting kilns, the heating types of equipment are the basic differences. There are two types: direct heating rotary kiln (Figure 1) and indirect heating rotary kiln (Figure 2). In the indirect heating rotary kiln, the rotary cylinder is heated from the outside. This can be achieved through a burner or electric heating Especially when the processed product is prone to generate strong dust, it must go through different temperature gradient requirements or be treated under special process conditions, such as inert or protective atmospheres. As the material of the rotary cylinder, metal pipes can be used at 1150 ° C according to the requirements of temperature, atmosphere, and material processing strength in the process. Internal heating rotary tubes are used to protect products from contamination and allow for much higher temperatures than metal tubes (up to 1600 ° C). However, the manufacturing process of the internal hot kiln is limited due to its geometric shape.