refractory

Impurities on the performance of refractory material have a certain impact, so in the production process, we should try to ensure the purity of raw materials, especially mullite insulation brick. Impurities can affect the chemical properties, which may affect the life of the furnace.

First of all, FeO can penetrate the mullite solid solution, even if the little effect on the melting point of mullite, the glass phase will be dark, affecting the performance of mullite insulation brick.

Second, the excess alkali metal oxide can reduce the content of mullite, and even damage the crystallization of mullite, at the same time will have an impact on the glass phase, and affect the performance of mullite insulation brick.

Finally, CaO will slow down the crystallization process of mullite, although the impact is very small, but still need attention.