Kiln Information

Civilization is based on a number of substances, and some of those substances require a large amount of heat. Cement and similar substances form the basis of our buildings, but require a huge amount of heat; cement has to be dried perfectly in order to become the powdery substance with which we are familiar, as well as some sort of motion that help grind it down. The best solution we have for this is the rotary kiln, a device that heats objects up while rotating, ensuring that the moisture will be removed from anything placed inside and effectively grinding itself down into powder.

More information on rotary kiln

How It Works

A rotary kiln is a relatively simple device: In essence, a large pipe is rotated at an angle just a few degrees above the plane. The pipe is heated, and the gases inside the pipe help heat whatever is inside the pipe and dry it. As the pipe rotates and the substance becomes drier it becomes to crumble, something that is accelerated by the motion of the pipe; the substance crumbles faster as gravity forces the substance in on itself and the chunks created help the grinding effect as well. The rotation of the pipe thus converts a wet substance introduced into the tube to powder within a few hours.


The rotary kiln has a number of basic parts. The most obvious part is the burner pipe; this is the pipe that extrudes from the rest of the kiln and rotates. When the operation is finished the pipe can be opened and the remains of the substance taken out. There is also the shell, which surrounds the rest of the equipment. The shell has a refractory lining which helps to protect from the heat caused by the internal heat exchangers to the pipe as well as against corrosive substances. There is also a drive gear in order to better control the speed at which the burner pipe rotates and the riding rings to rotate the burner piper. Some models also have wheels to help move the device to different locations as needed, even though the kiln is usually not moved from its location.


The rotary kiln is used in a wide variety of uses. The two best representative uses are cement and converting pig iron to slag. In order to create cement the wet material is introduced into the kiln; the kiln dries out the wet material, and as it dries out it crumbles into powder. The crumbling is encouraged as the mix of rock and powder combines, eventually grinding all the way down to powder. Pig iron can be introduced into the pipe instead, with the heaters eventually heating the iron to the point where it melts, with the rotation ensuring that all of the metal is heated and thus encouraging the metal to melt faster.

The rotary kiln is used to create a number of different substances, and has thus become the basis of a wide number of different processes used to build civilization. A simple device with a lot of different uses, it is highly useful in manufacturing.