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Zirconium Silicate

Views: 0     Author: Site Editor     Publish Time: 2022-06-06      Origin: Site

Zirconium Silicate


Nature:

It has high refractive index of 1.93-2.01 and chemical stability. It is a high-quality and inexpensive opacifier. It is widely used in the production of various architectural ceramics, sanitary ceramics, daily-use ceramics, first-class handicraft ceramics, etc. In the processing and production of glaze, it has a wide range of applications and a large amount of application. The reason why zirconium silicate is widely used in ceramic production is also because of its good chemical stability, so it is not affected by the firing atmosphere of ceramics, and can significantly improve the bonding performance of ceramics with glaze and improve the hardness of ceramic glazes. Zirconium silicate has also been further used in the production of color picture tubes in the TV industry, emulsified glass in the glass industry, and enamel glaze production. Zirconium silicate has a high melting point: 2500 degrees Celsius, so it is also widely used in refractory materials, glass furnace zirconium ramming materials, castables, and spray coatings.


When high-performance zirconium silicate has two conditions of whitening and stabilization, its performance in zirconium silicate powder, particle morphology, particle size range, dispersion performance in medium, and opacity segregation after application of brick or glaze are better than conventional zirconium silicate.


The whitening effect of zirconium silicate is due to the formation of baddeleyite zircon after the ceramic is fired, thereby scattering incident light waves, which is generally called large particle scattering or MieScattering. Combining the theoretical calculation and the actual situation of powder production, controlling the d50 value of high-performance zirconium silicate to be below 1.4um and d90 to be below 4.0um (based on the measured value of the laser particle analyzer made in Japan) will produce the best results. Creamy whitening effect. In the whitening effect of zirconium silicate, the concentrated particle size range is very important, and it is required to achieve as narrow a particle distribution as possible during the grinding process of zirconium silicate.


Production:

There are many impurities in the production of zirconium silicate, these impurities can be divided into: 1. Harmful impurities Fe2O3, TiO2 and Al2O3, general zirconium silicate production enterprises have the ability to remove iron impurities, but TiO2 and Al2O3 are more difficult to remove; 2 , Basically harmless impurities SiO2 and HfO2 (hafnium oxide), this impurity is basically harmless within the content range, and exceeding this range is not only harmful, but also has a great impact on the ceramic glaze and green body, such as SiO2 more When marking, the glaze is prone to later burst, and it is very easy to fail to meet the national inspection standards; 3. Trace alkali impurities Na2O, K2O and P2O5, these impurities are very few in content and belong to oxides with fluxing effect, even if they sometimes exceed the standard , and will not pose a great threat to the product; 4. Radioactive impurities Ra226, Th232, K40, zirconium silicate and fluorite are raw materials with high radioactivity, followed by feldspar, sand, and stone powder.


The production of zirconium silicate is the same as the production of ceramic enterprises, "stable is overwhelming", the stabilization of high-grade zirconium silicate should include the stabilization of sand source, the stabilization of production and the stabilization of the performance of finished powder.


The raw sand of zirconium silicate is zircon. The raw sand of high-grade zirconium silicate in my country is mainly high-quality zircon sand from Australia. It is not clear whether the source of sand in the United States is stable. There are also high-quality sand in the South my country Sea sand, and the stability of the sand source is still a problem. In actual production, it is required to homogenize the raw materials. For zirconium silicate production enterprises, as long as the high-quality zircon sand produced by the imported large sand mining company in Australia is used, strict inspection is carried out when entering the factory, and there is basically no need for homogenization. These raw materials have been homogenized in large mining companies.


Use Features:

(1) As an additive for ceramic glaze, zirconium silicate can improve the whiteness, strength, wear resistance, hydrolysis resistance and corrosion resistance with the decrease of particle size within a certain particle size range, enhance the self-cleaning ability and reduce the dosage.

(2) Since the nano-scale zirconium silicate powder has strong hydrolysis resistance, it can be used as the carrier of nano-functional powder in the water environment. For example, the nano-energy stone prepared by Hexiang Company uses nano-scale zirconium silicate as a carrier.

(3) Due to the strong oxidation resistance of nano-zirconium silicate, it can be used as a surface coating agent for functional powders. For example, the red glaze of Chinese red ceramics uses nano-scale zirconium silicate as a coating agent, and the color is bright red and does not fade.

(4) Due to the high strength and good wear resistance of nano-scale zirconium silicate, nano-scale zirconium silicate powder is a high-quality grinding medium and engineering ceramic raw material


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