Special supply paper materials for super white calcined kaolin

Special supply paper materials for super white calcined kaolin Kaolin mainly by less than 2 microns small sheet, tube, fold or flake kaolinite cluster minerals (kaolinite, dickite, pearl stone, halloysite, etc.) consisting of ideal formula AL2O3-2SiO2-2H2O, the main mineral component is kaolinite and halloysite, kaolinite cluster minerals in addition, there are montmorillonite, illite, pyrophyllite, quartz and feldspar and other Associated minerals. The chemical composition of kaolin contains large amounts of AL2O3, SiO2, and a small amount of Fe2O3, TiO2, and trace amounts of K2O, Na2O, CaO and MgO, etc. Quality of pure white kaolin with a high, soft, easily dispersed suspension in the water, good plasticity and high adhesion, excellent electrical insulation properties; has good acid-soluble, low cation exchange capacity, better fire resistance and other physical and chemical properties. Therefore kaolin has become papermaking, ceramics, rubber, chemicals, paints, pharmaceuticals and defense industries and dozens of mineral raw materials necessary. Product attributes 1, whiteness and brightness whiteness is one of the main parameters of kaolin process performance, high purity kaolin is white. Kaolin whiteness points natural whiteness and whiteness after firing. Ceramic materials, the calcined whiteness is more important, the higher the quality of calcined better whiteness. Its main color of kaolin contained metal oxide or organic matter concerned. Generally contain Fe2O3 in rose red, brown and yellow; with Fe2 + was light blue, light green; with MnO2 pale brown; containing organic matter is pale yellow, gray, blue, black and other colors. These impurities, reducing the natural whiteness of kaolin, in which iron, titanium minerals also affect the calcined whiteness, make porcelain fused pigmentation or scar. 2, the particle size distribution of particle size distribution refers to natural kaolin particles to different grain size (in mm or micron sieve mesh representation) proportion given continuous share in the range of (expressed in percentages). Particle size distribution of kaolin is significant optionality and process applications for ore particle size, its plasticity, mud viscosity, ion exchange capacity, forming properties, drying properties, firing properties have a significant impact. 3. Plasticity kaolin and water to form the mud in the external force can deform the external force is removed, still maintain the nature of this deformation is plasticity. Plasticity kaolin forming the basis of the process in the ceramic body, is also a major technology index. 4, binding and non-binding means kaolin combine to form a plastic material and has a certain plasticity clay in dry strength of performance. 5, sticky and viscous thixotropic means due to friction within the fluid inside and impede the flow of a feature relative. In the production process, the viscosity is important, it is not only important parameter in the ceramic industry, the paper industry has a great influence on. Thixotropic refers no longer has thickened into a gel-like mud flow into the fluid force, then gradually fused into undisturbed static properties. Viscous and thixotropic and mud mineral composition, particle size and cation type, generally, montmorillonite content of many, fine particles of sodium-based cation exchange, the viscosity and thickness of the factor. Therefore, the process used to add plasticity of clay and improve the fineness of other methods to improve its viscosity and thixotropy, by increasing the dilution of electrolytes and water and other ways to reduce it. 6, drying performance drying performance index kaolin clay material performance in the drying process. Including drying shrinkage, dry strength and drying sensitivity. 7, sintering sintered refers to the shape of the solid body of powdered kaolin is heated to near its melting point (typically in excess of 1000 ℃), the material spontaneously filled the gap and dense grain size fine performance of other instructions, distribution, can improve the coating brushing, improved coating resistance to moisture absorption and impact resistance, improved resistance to pigment flooding and floating, to improve the mechanical properties of the film and improve the coating scrub resistance, abrasion resistance and weather resistance.