Selection of refractory materials and masonry

Refractory materials in the unit kiln long-term by the high temperature, the temperature changes and flame, powder, glass of physical and chemical erosion and mechanical erosion effect, so over time, will gradually be peeling and melting molten glass, and To the glass caused by bubbles, wave tendons and refractory stones and other defects, serious when the drawing operation difficult. When the refractory material is eroded to a certain extent, it forced the unit kiln shutdown production. Therefore, from the glass melting quality and unit kiln operating life and other requirements to consider, must be based on different parts of the kiln and different thermal system, to correctly select the appropriate refractory.

First, E glass unit kiln selection of the main refractory material

1. dense chromium oxide brick

    It has the best anti-high temperature E glass erosion performance, the erosion of the glass is basically no pollution, it has become E glass unit kiln preferred high-quality refractory brick.

    The main technical indexes are Cr2O3 content> 94%, air porosity <15%, bulk density> 4.24g / cm3, and the erosion loss is only 1/2% of the dense zirconia brick. 10. The wall of the melting part of the melting chamber of the E glass unit kiln, the bottom of the high temperature part of the melting part, the wall of the main channel and the bottom of the tank, and the channel of the transition channel.

    C-1215, C-1215Z, CR-100 and the like, and GR95WA manufactured by VGT-DYKO, Germany, and UC-PC-95 manufactured by Nippon Shinagawa Co., Ltd., which are commonly used in the world.

  2. dense zirconia brick

    The corrosion resistance of the brick is slightly lower than that of the dense chrome oxide brick, and the isostatic pressing method is used. The technical index is ZrO2> 65%, the apparent porosity is less than 2.0%, the bulk density is about 4.25g / cm3, E glass in the temperature of more than 1370 ℃ there is erosion. The bottom of the melting part, the transition path, the bottom of the molding path, and the flow path and the trough of the molding channel, which are slightly lower in the glass chamber temperature of the E glass unit. In addition, dense zircon brick is also used as a dense brick brick lining brick.

    ZS-1000, ZS-835 and ZS-78 manufactured by CORHARP Co., Ltd., USA, and ZS65WA manufactured by PGT-DYKO, Germany, UC-Z, UC-CZ, UC manufactured by Nippon Shinagawa Co., Ltd. -CZB and so on.

    In recent years, China's Guangzhou Lingnan Refractories Co., Ltd. to introduce foreign technology and equipment, but also produced the use of isostatic pressing molding sintered dense zirconium brick, has been the domestic glass, glass furnace furnace part of the application.

    Germany KGT-DYKO company has developed a new type of coarse-grained structural zirconia brick, greatly improved the internal structure of the brick, thereby improving the resistance of the brick quenching and cooling performance. The bulk density was 3.75 g / cm3 and its porosity was 17%. The brick grade ZS65AR, has a good thermal shock resistance, the most suitable for drawing flow tank and leakage board tiles.

 3. Standard zircon brick

    The brick ZrO2 content of about 66%, bulk density of 3.7g / cm3, with good thermal stability and anti-peeling. The use of the powder in the erosion of the more serious mouth of the mouth of the mouth and the back wall, melting furnace observation hole brick and access to the flame space of the chest wall and roof brick, burner brick. But there are also the use of AZS burner brick and the use of mullite brick for the transition brick and kiln on both sides of the gap brick.

 4. sintered mullite tiles

    The chemical composition of the brick is Al2O3> 74%; SiO 22.2%. Bulk density of 2.5g / cm3, the main purpose is the standard chrome lining brick, melting part of the chest wall and the front wall, access flue lining brick, large arch and foot outlet mouth outside the brick, heat exchanger entrance flue outside the wall Wait. There is also a mullite brick which is melted by moulite and then has a better anti-high temperature creep and heat shock resistance. It can be used as kiln large and flame space chest wall. The effect is very good, the current localization has also been successful.

 5. Fused zirconia corundum brick (AZS brick)

    The chemical composition of the brick is ZrO2 34%, Al2O3 49.2%; SiO2 15.9%. Bulk density of 3.85g / cm3, the main purpose is to melt the mouth of the brick and brick mouth.

  6. Fused chrome corundum brick

    The chemical composition of the brick is 28.3% Cr2O3, Al2O3 58.3%, MgO, Fe2O3 5.2%. Bulk capacity of about 3.4g / cm3. Mainly used in the heat exchanger at the entrance of the flue interface brick.