Introduction to Common Refractory Bricks From Material Composition (2)

4. Corundum bricks, corundum refractory bricks are high-grade refractory bricks among high-alumina refractory bricks, and their aluminum content is above 90%. Different corundum refractory bricks can be processed according to different corundum raw materials, such as white corundum refractory bricks, brown Corundum refractory bricks, zirconium corundum refractory bricks, corundum mullite bricks, sintered corundum bricks, and fused corundum bricks, etc.

(1) White corundum bricks are made of white corundum as the main raw material and are sintered at high temperatures. Brown corundum refractory bricks and zirconium corundum refractory bricks.

(2) Corundum mullite bricks. When making mullite bricks, appropriate corundum is added, and processed by electric melting or sintering to produce fused corundum mullite bricks and sintered corundum mullite bricks.

5. Magnesium, magnesium-calcium, aluminum-magnesium, and magnesium-silicon are magnesia made from fused magnesia or sintered magnesia as the main raw material, adding powder and binder, and processed by electrofusion or sintering. Refractory material, magnesia has a high load softening temperature and strong resistance to alkaline slag and can be used in higher temperature working environments. Magnesia bricks can be added with other refractory raw materials as needed to produce refractory bricks with different properties, such as magnesia-carbon bricks, magnesia-calcium bricks, magnesia-alumina bricks, and corresponding refractory castables, and other magnesia refractory materials.

6. Carbon composite refractory materials are made of graphite, anthracite, coke, etc. as refractory raw materials, adding powder binder and sintering in a reducing atmosphere isolated from air. The types of carbon bricks are: self-baking carbon bricks, ordinary carbon bricks, semi-graphite carbon bricks, microporous carbon bricks, and high-temperature molded carbon bricks.

Self-baking carbon bricks are made of high-temperature burning anthracite as aggregate, a mixed powder of burning anthracite and coke as the fine powder, medium-temperature coal tar pitch as binder, kneaded evenly at a certain temperature, and formed by high-frequency molding vibration, products with precise dimensions and specific physical and chemical properties. It has the characteristics of high-temperature resistance, good thermal conductivity, high-temperature strength, strong corrosion resistance to slag and iron, and low price.

Ordinary carbon bricks are high-temperature-resistant neutral refractory products made of coke, anthracite, and graphite as the main raw materials, and organic materials such as pitch, tar, and anthracene oil as binders. Carbon bricks have high refractoriness, high thermal and electrical conductivity, and good slag resistance. Moreover, it has good thermal stability, low thermal expansion coefficient, high-temperature strength, high-temperature resistance, good wear resistance, and corrosion resistance to various acids, alkalis, salts, and organic solvents, but it is easy to oxidize in an oxidizing atmosphere.

Due to the properties of graphite and carbon brick refractories, it is a strong contender for reducing atmosphere applications. Blast furnaces use carbon bricks and graphite bricks in appropriate quantities, especially in their hearth; but carbon bricks and graphite bricks can also be applied in the furnace waist and other places, such as tap holes.