Causes of refractory stone defects in glass furnace

There are mainly the following aspects:

1. Improper use of refractory materials: Alternative refractory materials should be different according to the melting temperature, glass composition, and use parts. For example, high-silicon and low-alkali materials, quartz refractory bricks are generally used for pool walls; zirconium corundum bricks are used for the upper layer of alkaline materials. If silica brick is used at the fire hole, it is easy to be eroded and form stones, so corundum brick should be used.

2. The melting temperature is too high: the temperature is too high, the reaction viscosity of the glass liquid and the refractory material, and the flow erosion is also intensified, and the corrosion is accelerated.

3. Excessive amount of fluxing agent: When the amount of fluxing agent is too large, the corrosion of refractory materials by fluoride is particularly serious.

4. Poor quality of refractories: the firing temperature of refractories is not enough, the porosity is high, the raw materials are impure, the particle ratio is improper, the forming pressure is low (for pressure-formed refractories), the casting shrinkage of fused refractories is too large, Improper atmosphere during manufacturing, poor annealing, high internal stress, etc.

5. Easy-to-react refractory materials are built together: Easy-to-react refractory materials are built together, such as when silica bricks and clay bricks react at a temperature above 1400℃. Therefore, when using at this temperature, avoid direct contact .