With the discovery and understanding of the heat resistance of calcium aluminate, the output of calcium aluminate in Europe increased rapidly in 1913. By the end of the 1980s and 1990s, new casting technologies gradually appeared for monolithic refractory materials. The pumping and self-flowing pouring technology of low-cement castables were first introduced and used. After that, wet spraying or spraying technology appeared. In these technological changes, refractory cement was produced. Refractory cement is also called calcium aluminate cement or high alumina cement. Aluminate cement is a hydraulic cementitious material made of bauxite and limestone as raw materials, calcined clinker with calcium aluminate as the main component and alumina content of over 50%, and then ground. Aluminate cement is often yellow or brown, but also gray. The main minerals of aluminate cement are monocalcium aluminate (CaO·Al2O3, abbreviated as CA) and other aluminates, as well as a small amount of dicalcium silicate (2CaO·SiO2).
Refractory cement can be used to as binding agent for various refractory aggregates (such as corundum, calcined high alumina bauxite etc.) to make refractory mortar or concrete, which is used as lining for cement rotary kiln and other industrial kilns.
Maintenance of refractory cement
When the refractory cement lining is baked, the following matters must be paid attention to:
1) At room temperature of 350 degrees, it is most likely to cause partial bursting, so special attention should be paid to slow baking. If there is still a lot of steam coming out after 350 degrees of heat preservation, the heating rate should still be slowed down.
2) Under the conditions of poor ventilation and difficult discharge of water vapor, the holding time should be extended appropriately.
3) When baking with heavy oil, it is necessary to strictly prevent the heavy oil from spraying on the surface of the furnace lining to prevent partial bursting.
4) When baking with firewood, direct contact with the flame often causes local heating to be too rapid, so it should be protected.
5) For the newly poured refractory cement, it can be baked after at least 3 days.
6) The cooling of the refractory cement lining should also be slow to avoid forced ventilation.
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