A fine blend of unique physical and chemical properties

by:ZHENHUA     2020-05-30
Named after the famous 'Kao-ling' hill in China, Kaolin (Kaolinite, China Clay) is a group clay minerals belonging to sheet silicates with the general formula Al4[Si4O10](OH)8 Calcined Kaolin (Calcined Clay): Calcined kaolin is a commercial grade of kaolin which is synthesized by calcination process. The process of producing calcined kaolin from kaolin is carried out in either conventional calcination method or flash calcination techniques. Calcined kaolin, or popularly referred as calcined clay, is an anhydrous aluminium silicate with enhanced whiteness, hardness, electrical properties and kaolin particle structure. Metakaolin: Metakaolin is refined kaolin clay produced by dehydoxylation of kaolin above 700oC. Extensive researches on metakaolin have revealed that it is complex amorphous structure of silica SiO2 and alumina Al2O3. Silica Fume (Micro Silica): Silica fume, often confused with fumed silica, are primarily composed of non-crystalline SiO2 particles. It is produced as byproduct during the production of elemental silicon or alloys containing silicon. Industrial Applications of Calcined Kaolin: Calcined kaolin finds multiple applications across industries because of its color, softness, viscosity and small particle size. It is extensively used in coating materials, functional fillers, extenders, pigments and porcelain applications. In plastic industry, it is used in PVC cable to enhance electrical performance. Paper Industry Significant amount of calcined kaolin is used in Paper industry as a coating pigment and fillers. Its favorable optical properties and chemically inert nature is particularly suited for applications in paper industry. The relationship between the particle size and opacity of calcined kaolin holds immense value in paper industry. It is a cost-effective solution with its unique properties like coat weight, smoothness and texture. Rubber Industry Calcined kaolin is used as a functional filler in natural and synthetic rubber products as it lends strength, resistance against abrasion and rigidity. With low cost, whiteness and excellent functional features, it is one of the most widely used filler in rubber industry. Paint Industry Calcined kaolin finds usage in the extender pigments since decades. It is used as partial replacement of TiO2 and helps in maintaining proper dispersion because of its rheological properties. Calcined kaolin is inexpensive and gives desired flow to the paint solutions. Ceramic Industry Dielectric properties and chemical inertness makes calcined kaolin favorable in ceramic and porcelain electrical insulators. In refractories, it finds applications because of its exceptional dimensional stability, high fusion point and minimal water content. Plastic Industry Being chemically inert and well-suited particle size and structure, calcined kaolin is used as functional fillers in plastic industry. It gives perfect smoothness, finishing, chemical resistance and structural stability to the plastic products. In addition to above, calcined kaolin is also used in cement, fertilizers, detergents, textiles, cosmetics, insecticides and medicines.
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