Refractory materials used in the cement industry are generally divided into the following types:
Alkaline refractory materials have excellent properties of high temperature resistance and strong resistance to chemical attack. They are important kiln lining materials for cement kilns. However, alkaline refractory materials have the main disadvantages of high thermal expansion, high thermal conductivity and poor thermal shock resistance performance. Alkaline refractory materials for cement kilns mainly include direct bonded magnesia chromium bricks, semi-directly bonded magnesia chromium bricks, ordinary magnesia chromium bricks, dolomite bricks, magnesia bricks with and without zirconium, spinel and Chemically bonded unburned magnesia chromium bricks, etc.
High alumina bricks have high compressive strength, high refractoriness under load and good thermal shock resistance. High alumina bricks suitable for cement kilns mainly include phosphate bonded high alumina bricks, phosphate bonded high alumina wear-resistant bricks, anti-flaking high alumina bricks, chemically bonded (special) high alumina bricks and ordinary high alumina bricks.
Alkali-resistant bricks have excellent alkali corrosion resistance. Under certain conditions, they can react with alkali compounds in kiln materials and kiln gas and quickly form a closed dense protective glaze layer on the bricks, preventing further internal seepage. Alkali-resistant bricks are one of the indispensable kiln lining materials for new dry process kilns. Alkali-resistant bricks include ordinary alkali-resistant bricks, high-strength alkali-resistant bricks, alkali-resistant insulation bricks, etc.
Refractory castables have the characteristics of simple production process, energy consumption, flexible and convenient use, etc., and are widely used in preheater systems. Refractory castables suitable for cement kilns mainly include corundum castables, high-aluminum castables, alkali-resistant castables and lightweight castables.
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