Customer in Singapore ordered 215 tons silica refractory fire bricks
In November. 215 tons silicon bricks are packed for delivering to customer in Singapore. High quality silica refractory fire brick in Topower Refractory.
What is the main refractory material for glass melting kiln?
Silica brick mainly uses in glass melting kiln as refractory material.
The chemical composition of silica brick:
Silica bricks are made of high -purity quartz stones and mixed with a small amount of lime milk after being selected by burn. Part of its aggregate can be used after being broken with waste silica brick. Advanced silicon bricks should be treated with special chemical treatment. To remove impurities.
The raw materials and production processes used in silica refractory fire bricks:
1. The determination of the raw material ratio and particle composition
Silica brick raw materials are mainly quartz stones, waste silicon bricks, lime, mineralized agents and organic binding agents. Adding waste silica brick can reduce the burn of bricks and expand, but it will also reduce the refractory and strength of the product. Therefore, it should be determined according to different situations. The principle is that the larger the single weight of the product, the more complicated the shape, the more the addition, the generally controlled within 20%. Lime is also added in the form of lime milk, and the effect of a binding agent will increase the intensity after drying. The mineralized agents in production are mainly rolled iron oxide skin. The commonly used organic binding agent is sulfuric acid pulp waste solution
The general principles of determining the composition of silica brick is the following points:
① When selecting critical particle size, ensure that the brick is also stable for the maximum density and high temperature firing volume.
② hope that the critical particles in the blank are small and the fine particles are small.
③ When using different quartz stone mixes, the high expansion temperature began to add high granules with high granules, and began to expand the temperature with low particles with fine particles.
2. Determination of silica refractory fire bricks firing system
The silica brick changes in the process of firing, making it more difficult to burn it. Therefore, the physical chemical changes, the shape and size of the body, and the characteristics of the kiln should be targeted at the brick in the process of firing.
① The temperature section below 600 ° C. The heating should be faster and uniformly.
② In the temperature section of 7001100 ° C, the temperature rise speed can be evenly accelerated than the previous section.
③ At the temperature section of 1100-1430 ° C, the temperature should be gradually reduced.
④ Burning the flames with weakness at the high temperature stage, and at the same time, the temperature distribution of the temperature in the kiln is evenly distributed, and the flame should be avoided to impact the bricks. After reaching the highest fever temperature. There must be enough insulation time, generally fluctuating within 20-48h.
⑤ It can be cooled quickly above 600 ° C, and it is advisable to slow down at low temperature. Table 10-4 lists the heating speed in different temperature fan groups. Figure 10-1 shows the production process of silica brick.
