Refractory brick for glass kiln

High quality silicon brick for glass kiln

The company is one of the professional manufacturers of refractory bricks for glass kilns. It adopts multi-level high-purity quartz ratio, and the product physical and chemical indicators have reached the advanced level of congeneric products in the same industry. It is characterized by high load softening starting temperature and high refractory bricks for glass kilns. It has been used in glass melting kilns for a long time. At the same time, it is used in open furnace regenerator, high temperature hot blast furnace and silica industrial furnace masonry.

Refractory bricks for glass kilns are widely used, from low temperature to medium temperature to high temperature, and are necessary for industrial kilns to build lining structures. When we choose refractory materials, we have to consider many aspects. How to choose our suitable refractory brick products for glass kilns. First, we need to see which type of brick we need. The types of refractory bricks for glass kilns are different and have different uses. Second, we have to see which kind of furnace is used, and then look at the quality of refractory bricks for glass kilns. When determining the demand, the quality of refractory bricks reaches the standard, and then the price is compared. The following is an example of the three major float glass thermal equipment for glass production, including float glass furnace, float glass tin tank and glass annealing kiln.

Refractory Bricks for Glass Kilns During glass production, refractory bricks for glass furnaces function to melt the mixture into a glass liquid and clarify, homogenize and cool it to the temperature required for forming.

The tin bath is the key equipment for glass forming. The glass liquid with a temperature of 1050~ 1100 ° C flows into the liquid tin surface in the tin bath from the flow channel. The glass liquid is flat polished on the surface of the tin bath, and the glass ribbon of the required width and thickness is formed by mechanical drawing, edge holding and edge drawing machine control. And leave the tin bath in the process of gradually cooling to 600 ° C.

The function of the annealing kiln is to eliminate the residual stress and optical inhomogeneity of the float glass and stabilize the internal structure of the glass. The continuous glass ribbon produced from the tin tank at a temperature of about 600 ° C enters the annealing kiln through a transition roller.

These three kinds of thermal equipment all need to use refractory materials, and glass melting furnaces are often used in the following 9 kinds of refractory products:

1. Refractory bricks for glass kilns: glass kilns and silicon bricks

Silica bricks are widely used in glass kilns, and the main component is silicon dioxide (SiO2). The silica content required for silica bricks for glass melting kilns is required to be above 94%, the high service degree is about 1600~ 1650 ° C, and the density is 1.8~ 1.95g/cm3. The porosity is required to be less than 22%, and the larger the porosity, the worse the quality of the silica brick. The appearance of silica bricks is mostly white crystal, and the microscopic composition is the crystal of quartz. Because silica bricks undergo crystallization transformation and volume expansion at high temperature, especially at about 180~ 270 ° C and 573 ° C, the crystallization transformation is more intense. Adapt to the crystallization transformation of silica bricks during the roasting kiln and cold repair process, and take appropriate measures, such as elastic tensile tape, etc. Silica brick masonry should leave expansion joints.

The working temperature of silica bricks is about 200 ° C higher than that of clay bricks, but they have poor corrosion resistance to liquid glass and alkaline flying materials, so they are used to build large structures such as large concrete, parapets and small furnaces. In masonry, high-silicon refractory mud or silica brick powder and other materials close to the composition of silica bricks should be used as cementing materials.

2. Refractory bricks for glass kilns: glass kiln clay bricks

The main components of clay bricks are Al2O3 and SiO2. The Al2O3 content is between 30% and 45%, the SiO3 is between 51% and 66%, the density is 1.7~ 2.4g/cm3, and the apparent porosity is 12%~ 21%. The service temperature is 1350~ 1500 ° C. In the glass industry, clay bricks are used to build the bottom of the kiln. Walls and channels of the working part, walls of the updater, rafts, lower lattice bricks and flue ducts. As the temperature increases, the volume of the clay brick expands. When the temperature exceeds 1450 ° C, the volume will shrink.

3. Refractory bricks for glass kilns: high-alumina bricks for glass kilns

The main components of high-alumina bricks are also SiO2 and Al2O3, but Al2O3 should be greater than 46%. It is made of corundum, high bauxite or sillimanite mineral (Al2O3-SiO2). The density is 2.3~ 3.0g/cm3, the apparent porosity is about 18%~ 23%, and the high service temperature is 1500~ 1650 ℃. When the porosity of high-alumina bricks is low, the corrosion resistance is good. High-alumina bricks can be used to build cooling pool walls, updater, updater walls, etc.

4. Refractory bricks for glass kilns: mullite bricks

The main component of mullite brick is Al2O3, which is about 75%. Because it is mainly mullite crystal, it is called mullite brick. The density is 2.7-32g/cm3, the opening rate is 1% - 12%, and the high working temperature is 1500~ 1700 ° C. Sintered mullite is mainly used to build renewal walls.

Molten mullite is mainly used for laying pool walls, observation holes, wall sills, etc.

5. Refractory bricks for glass kilns: fused zirconium corundum bricks

Molten zirconium corundum bricks are also called white iron bricks. Usually, according to the content of zirconium, molten zirconium corundum bricks are divided into 33%, 36% and 41%. Zirconium corundum bricks used in the glass industry contain 50% to 70% Al2O3, 20% to 40% ZrO2, density 3.4 to 4.0g/cm3, apparent porosity 1% to 10%, high temperature about 1700 ℃, including, molten zirconium corundum bricks with 33% and 36% zirconium are used for masonry kiln wall, flame space chest wall, small furnace jet port, small furnace shovel, small furnace, tongue sputum, etc. Use% molten corundum bricks to build corners of pool walls, fluid holes and other glass to violently erode severe parts of solar eclipses. This material is a widely used molten refractory in the glass industry.

6. Refractory bricks for glass kilns: fused alumina bricks

Mainly refers to molten α, β corundum, molten β corundum cast refractory bricks, mainly composed of 92%~ 94% Al2O3 corundum crystal phase, density 2.9~ 3.05g/cm3, apparent porosity 1%~ 10%, high use, temperature is about 1700 ° C.

Molten alumina has good resistance to glass dialysis and hardly pollutes glass. It is widely used in glass walls, tank bottoms, flow channels, working section channel walls, material channel bottoms, etc. of glass melting kiln studios, and does not require refractory contamination.

7. Refractory bricks for glass kilns: quartz bricks

The main component of quartz brick is SiO2, the content is as high as 99%, the density is 1.9~ 2g/cm3, the fire resistance is 1650 ° C, the working temperature is about 1600 ° C, the acid corrosion resistance is used to build acidic boron walls, glass. Flame space thermocouple hole brick, etc

8. Refractory bricks for glass kilns: alkaline refractories

Alkaline refractories mainly refer to magnesia bricks, aluminum-magnesia bricks, magnesia-chromium bricks and magnesia-olivine bricks. Its properties are corrosion resistance to alkaline materials, and the refractory degree is 1900-2000 ° C. It is widely used in the upper wall of glass melting kiln renewers, renewal chambers, main structures and the structure of small furnaces.

9. Refractory bricks for glass kilns: glass kiln insulation bricks

The heat dissipation area of the glass furnace is large and the thermal efficiency is low. In order to save energy and reduce consumption, a large number of thermal insulation materials must be used to achieve integrated thermal insulation. In particular, the pool wall, pool bottom, concrete and updater walls, the molten part and the working part are insulated to reduce heat dissipation. Insulating bricks have large porosity and very low mass, and the density does not exceed 1.3g/cm3. Insulating bricks with large porosity have an adiabatic effect due to the poor heat transfer performance of air. Its heat transfer coefficient is 2 to 3 times lower than that of ordinary refractory materials, and the larger the porosity, the better the thermal insulation effect. There are many different types of thermal insulation bricks, such as clay thermal insulation bricks, silicon thermal insulation bricks and high aluminum thermal insulation bricks.