Refractory castable composition and application

The degree of refractoriness refers to the refractory castable cone sample that counteracts the high temperature effect without softening the melted temperature in the absence of load. The refractory castables are accompanied by high temperature skills, which originated in the middle of the Bronze Age. In the Eastern Han Dynasty of China, clay refractory castables have been used as kiln and enamel for burning porcelain.

Acidic refractory castables use silicon as an important component, and silica bricks and clay bricks are commonly used. Silica brick is a siliceous product containing more than 93% of silicon compound. The raw materials used are silica, waste silicon brick, etc. The acid slag has strong corrosion resistance, the load is softened and the temperature is high, and the volume does not shrink after repeated calcination, and even slightly expands; However, it is susceptible to corrosion by alkaline slag and has poor thermal shock resistance.

Neutral refractory castables are made of aluminum, chromium or carbon. More than 95% of the corundum containing aluminum alloy is a high-quality refractory castable with a wide function. Chromium bricks with chromium as an important component have good corrosion resistance to steel slag, but have poor thermal shock resistance and low temperature at high temperature load.

Alkaline refractory castables are composed of magnesium and calcium, and magnesium bricks are commonly used. Magnesia bricks containing more than 80% to 85% of magnesium in combination have very good resistance to alkaline slag and iron slag, and have higher refractoriness than clay bricks and silica bricks.