A refractory material is one that retains its strength at high temperatures. Refractory materials are used in linings for furnaces, kilns, incinerators and reactors. They are also used to make crucibles and moulds for casting glass and metals and for surfacing flame deflector systems for rocket launch structures.

A refractory brick is a block of refractory ceramic material used in lining furnaces, kilns, fireboxes, and fireplaces. A refractory brick is built primarily to withstand high temperature, but will also usually have a low thermal conductivity for greater energy efficiency.

Refractories play a critical, if unseen, role in both the rotary kiln lining, and the lining of the high volume static equipment areas that comprise a modern pre-calciner kiln system.

The durability of the rotary kiln brick lining generally determines the duration of a kiln operating campaign. Whilst great efforts are made to ensure appropriate refractory brick materials selection, installation, deployment (zoning) and the optimisation of the kiln light-up, it is primarily the nature and stability of the subsequent kiln operation that influences rotary kiln lining life.

A large number of kilns now use alternative fuels. Many of them substitute these alternative fuels through the main kiln burner as well as in the pre-heater / pre-calciner; the chemical and heat-release changes caused by inevitable short-term fluctuations in the fuel(s) mix has a major influence on the thermal, coating and atmosphere conditions existing through the rotary kiln into the pre-calciner.

Expert systems are available that help limit the influence of fuel mix fluctuations on the flame shape, but not many cement kilns are equipped with such systems. Consequently, the main influence of the use of alternative fuels is often on clinker chemistry due to the different ash compositions of individual alternative fuels.

Henan Zhengzhou Mining Machinery Co., Ltd is leading mining equipment manufacturing in the world, who has provided innovative technology and products for mine and energy of over 100 countries and district. We adopt the advanced technology and choose the refractory bricks according to different requirements, to make sure the normal operation and long lifetime of rotary kiln.