Understand the basic knowledge of refractory materials through ladle breathable bricks

For steel manufacturers, ladle air-permeable bricks are very important, and steel-smelters’ reliance on refractory materials can be said to be unparalleled. Taking air-permeable bricks as an example, this article focuses on thermal stability, mineral composition and chemical composition, slag resistance, The four aspects of burning index briefly talk about the knowledge of refractory materials.

The thermal stability of refractory materials: the ability of refractory materials to withstand rapid changes in temperature without cracking or damage is the thermal stability of refractory materials.

(Picture) Impermeable air brick

The mineral composition and chemical composition of the refractory material: The mineral composition is the mineral petrographic structural composition contained in the refractory product. For example, spinel is one of the raw materials of breathable bricks. The crystals of spinel include normal spinel structure and inverse spinel structure. Different refractory materials have the same mineral composition, and the size, shape and distribution of mineral crystals are different, which will lead to different properties.

Slag resistance of refractories: The ability of refractories to resist slag erosion at high temperatures is called slag resistance. At high temperatures, the slag becomes liquid, and after contact with the refractory material, it will form a liquid phase, which will cause the surface of the refractory material to peel off; or enter the interior from the pores of the refractory material (such as the brick core of the permeable brick ), temperature changes, volume expansion changes, resulting in loose and damaged refractories. The higher the porosity of the refractory, the easier it is for the slag to enter, and the more likely it is to cause damage to the refractory.

(Picture) Silicon carbide castable

Burning loss index of refractory materials: The burning loss index of refractory materials represents the index of the effect of electric arc on the burning loss of the furnace wall. This index plays an important role in determining the smelting process route. For example, the determination of the secondary side voltage of the ladle refining furnace is It is determined according to the burning loss index of refractory materials.

firstfurnace@gmil.com specializes in the production of refractory materials, such as ladle breathable bricks, nozzle block bricks, electric furnace covers, etc., focusing on the research and development, production and sales of refractory materials such as breathable bricks for 17 years. Professional manufacturers are trustworthy!