Zircon brick to a part of the smooth zirconia and zirconium corundum cement clinker and other raw materials as raw materials, after mixing rubber, forming, dry mania, in the high temperature fired shuttles kiln.

Zircon brick contains 67.23% zirconia and 32.77% silica. Tetragonal system, usually in the form of a quadrangle. Mohs hardness 7.5, the thermal expansion coefficient of 20 ~ 1000℃ is 4.2×10-6/℃. Melting point is 2430 ℃. Volume relative density 3.60 ~ 4.3g/cm3. The apparent porosity is 0% ~ 18%. The soft temperature under load is >1550℃. Semi - dry method and 1600℃ forging and firing were used. Suitable for sizing orifices for lining and continuous steel injection in steel casks.

Features

The brick has high molecular structure density, high volume relative density, extra bulk density, high impact toughness at room temperature and high temperature, good thermal shock reliability, low refiring and high temperature stress relaxation, and has high organic chemical reliability and anti-alkali corrosion, etc.

Application

Zircon brick is mainly used in high - rise brick and arch - foot brick in sodium - calcium laminated glass kiln.

The appearance specification, physical and chemical index, use period of handicrafts have reached or exceeded the standard of the same industry in the world.

Production process

Billet smelting is based on the basic principle of zircon transformation and re-fusion. Choose the smelting law period billet, the zirconium content of the sand can reduce the original grain size does not have all the provisions, but should pay attention to the water content, in order to prevent in the melting process caused by the blast furnace. Common raw materials do not need all mineralization agents, but in order to reduce flying materials and soot in the whole process of melting, it is necessary to add organic chemical fusion agents, such as AST or uf resin, into pellets in the original sand.

When the temperature of aqueous solution is 1900℃ for gravity casting, sand pits made of zirconium sand or sand moulds prefabricated with zirconium sand can be introduced. The zirconium sand is made of Canadian crude zirconium sand. After mixing the sand with 4% cementitious agent (weight meter) and 5%~7% water, it is made by hand and pounded into shape. After being air-dried and heat-insulated for 4h at 110℃, it can be assembled and applied after slow cooling. After the sandpit is introduced, it is covered with zirconium sand, which can be cooled by nature to room temperature or insulated at 1450℃ for 3~4 hours and then cooled by nature to room temperature. The relative density of aggregate volume in the smelting period reached about 4.3g/cm3, the apparent porosity was less than 1%, and the high temperature property was stable and corrosion resistant.

Physical And Chemical Indicators