The calcined kaolin originated in the United States. Initially to remove organic carbon values ??in the soft kaolin, to improve the whiteness. Later it was used for this method, the characteristics of the kaolin processing, production performance, high-grade, the value is much higher than the ordinary kaolin products. Greatly broadens the range of applications of kaolin. China has abundant coal measures kaolin resources for coal kaolin, calcined essential key processes. The main purpose of the calcined kaolin is: 1, the removal of organic carbon and other impurities in mineral in order to improve the whiteness; 2, stripped kaolin moisture contained in a hydroxyl group in order to improve the void volume and the chemical reactivity of the calcined product, to improve the physical and chemical properties, meet a wide variety of application needs. After calcination processing kaolin off in addition to the structure or crystal water, carbonaceous and other volatile substances, into it kaolinite, trade name "calcined kaolin. Calcined kaolin has a high whiteness, small bulk density, specific surface area and pore volume, range, covered and wear resistance, insulation and thermal stability characteristics, widely used in paints, paper, plastics, rubber, chemicals, the field of medicine, environmental protection, high-grade refractory. Kaolin is a larger amount of mineral filler in the rubber industry. Of the plastic material of the filling kaolin processing easy, smooth the surface of the plastic material, and carbon black and used, in favor of a dispersion of carbon black in the rubber compound, but kaolin DPG sorption rate greater effect on the vulcanization rate. Filler kaolin vulcanizate, relatively high tensile strength, good abrasion resistance, but poorer tear strength. Filling kaolin rubber is widely used in the hose, belt, pads, shoes, especially oil, acid, heat, and other products. Activity kaolin kaolin, chemical modification, a significant effect on improving product performance and the development of light-colored rubber products. ; In the sheath of the wire and cable, to improve its abrasion resistance, anti incision extensibility; the insulating rubber compound, so to obtain a stable moisture electrical properties, and increase the modulus and tensile mild; in the pipe , can improve the solvent resistance and abrasion resistance; the belt, can improve the wear resistance of the belt, and to increase the the mild hot tear and to reduce the heat accumulation. In the sole increase soles flexing life, to improve their wear resistance; the washer, can reduce the compression deformation ratio. In the process, the plastic material of the mixed-period can be shortened to reduce its viscosity, and the like. Calcined kaolin as a very broad application prospects of the rubber filler. Modified calcined kaolin rubber surface polarity similar, easily rubber wet, eat the powder faster, improve its dispersion effect, play a reinforcing effect, and to improve the mechanical properties of the production process and product. Common modified calcined kaolin in the rubber, generally can play a semi-reinforcing effect, and is conducive to the dispersion and exchange; vulcanization efficiency is also improved significantly, its processing properties are also improved to a certain extent and can increase the filling amount, is conducive reduce costs. Calcined kaolin treated by the special method, greatly enhance the specific surface area, and then subjected to surface treatment, and can improve its reinforcing effect in rubber, certain aspects can be achieved even vapor carbon black or precipitated carbon black effect.