After refractory material is mixed with impurities, which has a certain impact on its performance, so the production of refractory products should try to ensure the purity of raw materials, especially for mullite light brick, the impurities will affect its chemical properties, thereby affecting its use When the furnace life caused. How does doping affect the quality of mullite brick?
1. Iron oxides such as iron oxide, ferrous oxide can penetrate into the mullite solid solution, although the melting point of mullite has little effect, but the impurities will be cast glass stained into a dark, increase the glass content, And the fire resistance of the product is reduced.
2. Too much alkali metal oxide can reduce the mullite content, serious or even break the mullite crystallization and melt, while producing more glass phase affect the performance of mullite light brick.
3. Calcium oxide slows down the role of light mullite crystallization, although little effect, but also need attention.
4. A small amount of magnesium oxide will produce impurities in the crystal, the corresponding reduction in the number of mullite.