Analysis of magnesium silicate raw materials used in construction ceramics – mag
HC Chemical Network Hearing, in the construction of sanitary ceramics products, magnesium silicate ceramic materials, ceramic glaze blank and play an important role. For example it can improve product performance glaze and blank, play an important role. At present, domestic and international markets for the appearance of building and sanitary ceramics products demands more. Particularly in enhancing the building and sanitary ceramics products, whiteness, semi-transparency and thermal stability of magnesium silicate ceramic raw materials is essential additives. In this paper, the magnesium silicate mineral commonly used ceramic materials, such as talc, serpentine, olivine, etc., in building and sanitary ceramics in use for more discussion and description.
1, talc (3MgO? 4SiO2? H2O) 1, talc chemical and physical properties of raw materials
Is well known that natural water content of talc is magnesium silicate mineral raw materials, the chemical formula for 3MgO? 4SiO2? H2O. It is the theory of chemical composition; MgO content of 31.7%, SiO2 content of 63.5%, H2O content of 4.8%. Natural talc mineral, its appearance is white or Shaodai pink, usually rough scaly. Dense sweetlips sheet called block talc, creamy feel with the volume density of 2.6 ~ 2.8 g / cm3. The hardness of natural talc raw materials smaller, only 1 to 1.5, can be carved with a fingernail. The thermal properties of natural talc raw materials as follows: heated to 870 , the talc crystal water began to take off, to 950 , all of dehydration to complete. The melting point of natural talc 1550 . Talc in ceramics have good heat resistance, lubricity, acid resistance, insulation, and glazing type material has a strong adsorption. The good performance of the above, talc in ceramics for daily use, building and sanitary ceramics and special ceramics used in a wide range of products. Especially in improving the whiteness of the product, expansion coefficient, to prevent cracking and other products, the performance of a very important role.
2, Talc in Ceramics Industry Talc in ceramic industry, a wider range of applications, such as the production with high brightness, high-quality daily-use porcelain transparent talc and porcelain industry in the production of high-frequency electrical porcelain (also known as ceramic device), or as building health ceramic products such as glazed ceramic tile glaze. Feldspathic porcelain in a small amount of talc in the blanks, you can reduce the firing temperature, firing range to expand, reduce the porcelain body of free quartz content, improve products, semi-transparency and thermal stability. Some high-end district of northern China Daily Porcelain Porcelain varieties have joined a certain percentage of talc raw materials. Ceramic products in the blanks in order to replace feldspar talc, can reduce the product moisture swelling and post-cracking defects, while reducing drying knot, knot and firing shrinkage. Health products such as construction glazed tiles, wall tiles in both the introduction of a talc material to enhance the appearance and inner quality of products.
Talc in building and sanitary ceramics glaze is more important and broad role. It can reduce the firing in the glaze of the expansion coefficient to prevent the glaze cracking. Since the formation of talc in the glaze to enhance the ability of prism-like crystals reflective material, thereby enhancing the opaque glaze effect and help to improve the whiteness of glaze. Glazed tiles in the glaze, the talc can be composed of phosphorus and magnesium apatite emulsifying agent and brightener, and the firing temperature is low, wide range, and can also lower the cost of milk white glaze products. In addition, the glaze in high-magnesium lime to form diopside crystal class of milk white glaze. These do not add the emulsifying agent (zircon) of milk white glaze, can be * self-formed milk-white effect. In addition, the talc can also increase the glaze firing temperature range, to avoid the firing of glazed smoked defects. Prior to use as a formula, natural talc material to go through the calcination temperature is about 1200 to improve the technological properties of talc.
3, talc The Distributing China has rich resources
talc, mineral quality and quality is also very good, the more famous Haicheng, Liaoning, Shandong Yu Yang, Guangxi Longsheng, etc., are the main origin talc. In addition, Qixia, Taiyuan, Lijiang, Yunnan, Guangdong and other places also produce talc Gaozhou.
2, Serpentine (3MgO? 2SiO2? 2H2O) 1, physical properties
In ceramic technology, the Serpentine is a kind of magnesium silicate.
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