The difference between the spinel brick and silicon mullite brick

This is the two kinds of products: silicon refractory mullite brick, mullite bricks should be. The main component is aluminum and silicon, crystalline mullite to A3S2 (3AL2O3.2SIO2). The main ingredient is magnesium spinel or spinel, namely MGO and Al2O3.

Mullite brick belongs to the silicon aluminum brick, the main characteristic is thermal expansion coefficient is low, good resistance to thermal shock, resistance to wear and chemical corrosion resistance.

Belong to the mg Al spinel brick brick, is the main characteristics of anti erosion ability,refractory material, good abrasion resistance, good heat shock stability. Their bulk density higher than mullite stoned. However, there are problems of spinel water, may react with steam powder. In this sense, the mullite is more stable.

What is said above the silicon mullite brick has many advantages, but we choose to forget a little, it is the main cause of low thermal conductivity! Refractory materials but resistance to chemical attack ability is not very good, also thermal shock is not very good, for the following reasons, pressure and thermal shock is inverse proportion relationship.

The main characteristics of spinel brick is resistance to mechanical stress better, refractory material is suitable for use in near tyre. For the water problems in the above posts have said, please note that the coefficient of thermal conductivity!

Clay brick appear “black” or “red” reasons

Clay brick firing, sometimes a “black” or “red” waste. The reason there is no consensus clear. That is due to lack of oxidizing atmosphere, and firing caused by excessive. Brick kiln firing process, if the lack of organic matter oxidation atmosphere, the brick at the beginning beforesintering to oxidation burn, will make the sintering products inside showed different degrees of black, red. In addition, iron, titanium impurities contained in the brick, in the original fast atmosphere, reducing from high valence oxide into low oxide, also can make the products inside is black or brown green. When the firebrick appear after firing this kind of situation, often used in the production of: enhanced oxidation atmosphere in the kiln, to keep the adobe oxidizing atmosphere longer and give a full 600 to 1000 DEG C; or adjust the kiln method, increase tile surface oxidized area, make direct contact with the flame of the green area increases, improve the effect of oxidation.