What are the principles that should be followed for the choice of refractory materials for glass kilns?

2017-07-07 09:16:21

  At present, China's glass melting furnace life is generally only 2 to 3 years, while some developed countries were 5 to 8 years or even longer. The reason is that China's refractory quality is only one of the reasons, more importantly, not yet pay attention to the choice of refractory materials and with the use of the problem. Material selection, must focus on the overall situation, otherwise, even if the high quality refractories accounted for a large proportion, will still affect the life of the furnace.

    The choice of refractory materials for glass kilns is as follows
    1. According to the type of kiln and the characteristics of various parts of the selection of reasonable refractory kiln parts of the different parts of the damage caused by the difference, requiring the material and the characteristics of the work to adapt. Such as flat glass furnace with brick and low-alkali borosilicate instrument glass kiln brick is not the same, with a melting furnace, wall brick and large magnetic materials are not the same, small furnace brick and flue brick is not the same The The reason is that these parts of the different working environment, material performance should be matched with the environment.
    2. According to the choice of glass components of the corresponding refractory material to reduce the pollution of glass and glass contact with the refractory material, by the erosion of molten glass and contaminated glass liquid; and large magnetic, chest wall is eroded, the droplets will contaminate the glass: Material particles fall into the glass can also cause pollution. Because the composition of refractory material and glass there is a big difference between. If the material contains colored ions, will make the glass coloring; into the glass of the refractory material will make the glass original plate crystal and stripes, nodules; unmelted refractory particles become refractory stone; porosity, Poor quality refractory contact with glass will bring a lot of bubbles. For the same composition of the glass, different refractory materials are eroded and the degree of contamination of glass liquid is different, so should be based on the choice of glass components of the corresponding refractory material.
    3. According to the use of materials to select the performance of refractory materials Although the material selection is not any part of the best quality refractories, but the material must be able to meet the performance requirements. General should be noted: in the use of temperature and other conditions of use. Has a high resistance to chemical erosion, contact with the material without contact reaction; has good thermal shock stability, in order to avoid changes in temperature caused by cracking of the brick; re-burning volume stability, especially with regard to try not to use Full heat shrinkable material; with sufficient fire-resistant sneeze and load softening temperature, so that the material can withstand thermal shock and high temperature mechanical load; shape is correct, the size is correct to reduce the amount of material processing to improve the overall masonry The Reduce the slit.
    4. Can be mass-produced, and refractory prices are not too high Since the emergence of zirconia corundum brick, sintered refractories are also towards the use of high-quality raw materials and the use of new technology in the direction of development, so that glass refractory refractory material has undergone tremendous changes The Improve the use of performance, in order to improve the glass melting process, improve the quality of glass to create a good condition