The molten glass and flame-flying materials melted in the glass-melting furnace will cause certain erosion and damage to the refractory materials, thereby affecting the service life of the glass-melting furnace. When using zircon bricks in glass melting furnaces, it is necessary to avoid and reduce contamination of the glass liquid. Therefore, the selection of refractory materials also has a great relationship with the life of the glass melting furnace and the quality of the glass.
Zircon Bricks for Glass Melting Furnace
Refractory materials used in glass melting furnaces are still shaped and unshaped refractory materials. Rongsheng Refractory Materials Manufacturer supplies refractory materials for glass melting furnaces – zircon bricks. Zircon bricks for glass kilns are made of zircon as the main raw material, with binders and additives added in proportion. It is made by stirring, kneading, shaping, drying, and then firing at high temperatures. Zircon bricks are divided into high-density type and dense type according to the production process and physical and chemical indicators.
Performance of Dense Zircon Bricks for Glass Kilns
High refractoriness and high charge softening temperature.
Strong resistance to slag liquid erosion and acid resistance.
High compressive strength.
Good thermal shock resistance.
Where are dense zircon bricks for glass kilns mainly used? Zircon bricks are used as the working layer of the glass kiln wall. They have high density and have strong resistance to the erosion of glass liquid as the working layer of the pool wall. What is the price of dense zircon bricks for glass kilns? Currently, the price of zircon bricks on the market is around 24,000 yuan. For the actual price of dense zircon bricks for glass kilns, you can consult the manufacturer. Only by combining the actual conditions of the kiln can you get the most satisfactory product and price.
Ingredients for the Production of Zircon Bricks for Glass Kilns
Zircon (ZrSiO4) belongs to the tetragonal crystal system. Its theoretical composition is ZrO2 67.2% and SiO2 32.8%. It is the only compound in the ZrO2-SiO2 binary system. Its thermal expansion coefficient is small, its load softening temperature is high, its thermal shock stability is good, and its thermal conductivity decreases as the temperature rises. Therefore, zircon refractory materials are indispensable materials for industrial kilns such as building materials, light industry, electronics, and metallurgy.
In recent years, with the advancement of glass industry technology and the application and promotion of kiln insulation technology, the usage of machine-pressed zircon bricks containing 65% zirconium has been increasing. Mainly used in glass kiln upper gaps, upper partition walls, fire viewing holes, temperature measuring holes, and other parts. The temperature of this part is high and it is eroded by flying materials and washed by hot airflow, making the environment very demanding.
To produce zircon bricks with a Zr2O3 content greater than 65%, the Zr2O3 content of the raw materials used must be greater than 66%. The zircon raw material is in the form of sand and cannot be used directly to make bricks. It must be finely crushed. Due to the large grindability index of zircon, a vibration mill, and airflow mill are used to obtain fine powder.
Due to the use location of ZrO2-containing 65% zircon bricks, the material should have good high-temperature physical properties, and the aggregate is closely related to it. The zircon is first ground finely and then made into a green body, which is then calcined at high temperature and then broken into different particle sizes. Since zircon material is a brittle material, the broken particles are in the shape of flakes. The normal temperature compressive strength of flake materials is about 50% higher than that of granular materials. On the contrary, under the same conditions, the volume density of granular materials is 0.12g/cm higher on average than that of flake materials. Taking both compressive strength and density into consideration, the crushed materials must be properly processed before use.
The batch materials are mixed on a wheel mixer, trapped for 16 hours, and then formed on a large-tonnage brick press with a forming pressure of 700~1000Kg/cm. Applying large pressure can lead to a reduction in the average distance between adjacent particles and an increase in the contact area, which is beneficial to sintering. However, when it is increased to a certain extent, the effect is extremely insignificant. Appropriate pressure and pressurization methods are the key to solving the problem of molding infertile materials.
The sintering of zircon is difficult and relies on solid phase diffusion at high temperatures, so its speed is slow. Adding MgO, CaO, Y2O3, TiO2, and ZnO2 can reduce the sintering temperature and promote sintering. In this sintering, 1.5%~2.75% Y2O3 and TiO2 were added as sintering accelerators, and the sintering was performed in a shuttle kiln at a sintering temperature of 1580~1650°C. The decomposition temperature of zircon is 1676°C. As the impurity content increases, the decomposition temperature decreases. High purity of raw materials is the primary condition for producing 65% zircon bricks containing zirconium with excellent properties.
Zircon bricks are refractory materials with zirconium silicate (zircon) as the main component. Contains 67.23% zirconium oxide and 32.77% silicon oxide. Tetragonal crystal system, usually in the shape of square prisms. Mohs hardness is 7.5, and the expansion coefficient at 20~1000℃ is 4.2×10-6/℃. Melting point 2430℃. Bulk density 3.60~4.3 g/cm3. The apparent porosity is 0%~18%. Load softening temperature>1550℃. It is produced by semi-dry pressing and calcining at 1600℃. Mainly used for lining steel drums and sizing nozzles for continuous steel injection.
Zircon bricks are refractory products made of natural zircon as raw material and soft clay as binder. The production process is as follows: pulverizing natural zircon sand into pellets, calcining and then pulverizing it into a suitable particle size, and then mixing ingredients, trapping materials, high-pressure molding, drying, and high-temperature firing.
①High temperature resistance, high strength, and wear resistance.
② Strong slag resistance, resistance to erosion, and erosion by molten steel and glass solution.
③ The thermal expansion rate is small and the volume is stable at high temperatures.
④Excellent thermal shock resistance.
⑤High bulk density, low porosity, and strong permeability resistance.
② Materials used for the pavement tiles or back wall of the glass kiln and around the feeding port can also be used for important parts such as those that come into contact with the glass melt.
③ The bottom of the furnace is mainly because zircon bricks have the property of not being corroded by metal chromium, aluminum oxides, and their slag.
Zirconium refractory bricks. Zirconium-containing refractory bricks are an acidic material made from natural zircon sand (ZrSiO2). Zirconium refractory bricks are different from silicon-aluminum series refractory bricks and carbon-containing series refractory bricks. It has good slag resistance, a small thermal expansion rate, and thermal conductivity decreases with the increase in temperature. It has a high softening temperature under load, high wear resistance, and good thermal shock resistance. It has become an important material in various industrial fields.
Zircon bricks. In the steelmaking process, the tapping degassing method is used, and zircon refractory materials have good corrosion resistance and thermal shock resistance to slag and molten steel. And suitable for working under reduced pressure, it is widely used in the metallurgical industry for masonry degassing ladle linings, stainless steel ladle linings, continuous casting ladle linings, sprue bricks, Plug bricks, sleeve bricks and high-temperature induction furnace linings, etc. Zircon refractory bricks are highly resistant to acidic slag and glass and are therefore also widely used in severely damaged parts of glass kilns where the most reactive glasses are smelted. Zircon refractory materials also have the property of not being penetrated by metal aluminum, aluminum oxides, and their slag. Therefore, good results are also obtained on the furnace floor of aluminum smelting.
Rongsheng Refractory Materials Manufacturer is a refractory material production enterprise integrating R&D, production, and sales. The company’s address is located in Xinmi City, Henan Province, which is known as the “Hometown of Refractory Materials”. The main products of Rongsheng Refractory Materials Manufacturer include high alumina refractory bricks, high alumina refractory balls, high alumina castables, high alumina lightweight bricks, and other refractory materials.
