Learn the basics of refractory materials through breathable bricks

Learn the basics of refractory materials through breathable bricks

For steelmakers, the importance of breathable bricks is unquestionable, and the reliance of steelmaking on refractory materials can be said to be unparalleled; taking breathable bricks as an example, this paper discusses thermal stability, mineral composition and chemical composition, slag resistance , The four aspects of burning loss index briefly talk about the knowledge of refractory materials.

Thermal stability of refractory materials: the ability of refractory materials to withstand rapid cooling and rapid thermal changes in temperature without cracking and damage is the thermal stability of refractory materials.

Mineral composition and chemical composition of refractory materials: Mineral composition is the mineral lithofacies structure components contained in refractory products. For example, spinel, one of the raw materials of breathable bricks, the crystal of spinel includes normal spinel-type structure, reversed. Spinel type structure. The mineral composition of different refractories is the same, and the size, shape and distribution of mineral crystals are different, which will lead to different properties.

Slag resistance of refractory materials: The ability of refractory materials to resist slag erosion at high temperature is called slag resistance. At high temperature, the slag becomes liquid, and it forms a liquid phase after contacting with the refractory material, which will make the refractory material. The surface is peeled off; or from the pores of the refractory material into its interior (such as the brick core of the breathable brick), the temperature change, the volume expansion change, resulting in the loose damage of the refractory material. The higher the porosity of the refractory material, the slag The easier it is to enter, the more likely it will cause damage to the refractory.

The burning loss index of the refractory material: the burning loss index of the refractory material represents the index of the burning effect of the arc on 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 the refractory material.