What Are The Industrial Uses For Kaolin


Summary:1.Application Of Kaolin In Papermaking IndustryIn the papermaking industry, the international market of kaolin is relatively prosperous, and its sales volume ex

1.Application Of Kaolin In Papermaking Industry

In the papermaking industry, the international market of kaolin is relatively prosperous, and its sales volume exceeds those of ceramics, rubber, paint, plastics, refractory materials and other industries.In pulp, kaolin usually does not react with its ingredients, is highly stable, and remains intact in the paper fiber.At the same time, kaolin particle size, strong mobility, mechanized production can ensure that the paper coating thickness is uniform.Because of the above properties, kaolin is generally used as paper filler and coating material in the production process.

As a filler, kaolin can fill the space between the paper fibers, increase the density of the paper, reduce the transparency of the paper, improve the flatness of the paper, and enhance the ability of the paper to absorb ink.Therefore, kaolin can partially replace expensive fillers as filling agent and brightening agent, without affecting the quality of products.Kaolin used as coating material, is the use of its coverage, the flake particles coated on the surface of the paper, enhance its smoothness, brightness, cleanliness, printability, opacity, etc., can improve the paper to ink inclusiveness, permeability and paper appearance.

2.Application Of Kaolin In Ceramic Industry

In the ceramic industry, kaolin was used earlier than other industries and in very large quantities, usually accounting for about 20 to 30 percent of the formula.Kaolin can increase the content of Al2O3 in ceramics, and the mullite formation process is easier to proceed, thus improving the stability and sintering strength of ceramics.In ceramic sintering, the decomposition of kaolin into mullite is the process of forming the frame of ceramic body. This process can widen the firing temperature range, prevent the ceramic body from deforming easily, and improve the whiteness of ceramics.At the same time, kaolin itself also has the characteristics of bonding, plasticity, bonding, suspension and so on, which can improve the formability of porcelain clay and enamel, and is more conducive to the processing process of billet, grouting and ceramic forming.In addition, the ceramic process has requirements on the chemical properties, particle size, crystallization degree and other properties of kaolin. In order to ensure the quality of ceramic processing, various parameters of kaolin should be strictly controlled in industry.

3.Application Of Kaolin In Refractories Industry

Because of its high refractoriness, kaolin is usually used in the production and processing of refractory products.Refractory materials are mainly divided into firebrick and silicon aluminum cotton two categories, with high temperature resistance and pressure does not deformation characteristics.A series of high temperature clays, including kaolin, bauxite and bentonite, are collectively referred to as refractory clays.Some kaolin with low whiteness can not be used to process ceramics and papermaking, but it can become a high-quality raw material for refractories.Therefore, how to comprehensively develop and utilize kaolin, improve its utilization rate, and create an important market for refractory clay and refractory materials has become a new topic of concern.

4.Application Of Kaolin In Rubber Industry

Kaolin used in rubber industry, fill to the colloid mixture, can enhance the wear resistance of rubber, chemical stability and mechanical strength, prolong the curing time, also can adjust the rubber mixing, rheology, sulfide, improve the consistency of unvulcanized products, to prevent the collapse of soft, sag, drooping, flat tube, deformation, etc.Its rubber products permeability, water resistance, chemical activity, fire resistance and other characteristics have been greatly improved accordingly.At the same time, kaolin as a filler can also reduce the amount of other raw materials in rubber, greatly reducing the production cost of rubber without significantly affecting the performance of rubber.

5.The Application Of Kaolin In Paint Industry

Ti02, CaC03, talc, kaolin are the main mineral raw materials used in the paint industry.Among them, kaolin has requirements for its dispersibility, particle size, and the content of colored oxides.Because kaolin has white color, low cost, good fluidity and suspension, chemical inert, strong covering power and other properties, so it mainly plays the role of filling material and color material substitute in paint, and can reduce the demand for expensive dyes.Kaolin can improve the hardness of the coating, improve the quality of the coating, and make the coating have good anti-corrosion, opacity and anti-sedimentation.Kaolin with different particle size can be used in different kinds of paints. Kaolin with smaller particle size can be used in processing high-light paints or latex pigments, while kaolin with larger particle size can be used in processing dim light paints or flat light paints.Rinse kaolin is soluble in water and suitable for making latex pigments.Calcined kaolin is suitable for high temperature wear-resistant paint, light color paint for wall painting, and bottom paint for metal products. Its good advantages make calcined kaolin develop rapidly in the paint production industry.

6.Kaolin Is Used In The Plastics Industry

Kaolin as a filler, the general dosage of plastic is 15%~60%, its role is to make plastic products surface smooth, accurate size, chemical corrosion resistance, reduce thermal shrinkage and thermal fission, is conducive to the polishing and grinding process.Kaolin is often used as a fortifier in the production of PVC to improve the wear resistance of plastic products.The modified kaolin can also be used as a functional additive to improve the mechanical, thermal and electrical properties of polyester, nylon and other plastic products.In the production process of fiberglass reinforced polyester, the addition of kaolin produces a uniform, high-strength whole, which greatly improves the flow performance of large products (automobile bodies, hulls, etc.).In addition, in some plastic systems, kaolin can improve the dispersion, which is conducive to the surface finishing.

7.Kaolin Is Used In The Manufacture Of Glass Fiber For The Pool Kiln

Kaolin, which has a low iron content, is used in fiberglass manufacturing, mainly as a source of aluminum and silicon, and also to dull its luster.Pool kiln glass fiber wire drawing technology content is high, for glass fiber forming, the requirement to reach the quasi optical level.The quality and stability of kaolinite homogenized micropowder are the primary factors affecting the drawing process of glass fiber in the pool kiln. The alkali free glass fiber in the pool kiln has strict quality requirements for kaolinite homogenized micropowder.The optimum proportion of mineral types can greatly improve the quality of glass solution. The particle size of kaolinite homogenized micro powder is proportional to the melting reaction speed. The particle size composition should be narrow, and the water content should be greater than 0.5%, so it can not be used.

8.Application Of Kaolin In Cement-based Materials

Kaolin becomes metakaolin by dehydrating.Cement is usually prepared by means of alkali activation or used as an additive to concrete.Kaolin can improve the strength, workability and durability of concrete, and resist the self-shrinking phenomenon of concrete.Kaolin cement-based materials have excellent properties and wide application fields, and the development prospect is worthy of attention. However, the research in this field started late in China.With the continuous development and utilization of this material, China's social and economic construction will make great progress.

9.Application Of Kaolin In FCC Catalyst

Kaolin is used in FCC catalyst on the one hand as an adhesive catalyst carrier, mainly for FCC catalyst to provide good wear resistance, appropriate bulk density and other physical properties or as an active component accelerator;On the other hand, the all-clay type catalyst was prepared, that is, Y-type zeolite catalyst was directly grown by hydrothermal crystallization on kaolin microspheres.Due to the special preparation process, this kind of catalyst has excellent activity, stability, resistance to heavy metal, residual cracking property, gasoline selectivity, wear resistance and reproducibility, and the processing process is simple. It is a very promising FCC catalyst.

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