Сement kiln is a type of rotary kilns. Most Portland cement is made in a rotary kiln. Cement rotary kiln are used also for heat processing of another minerals and aggregates such as lime and iron ore.
Basically, cement kilns are used for the pyroprocessing stage of manufacture of Portland and other types of hydraulic cement, in which calcium carbonate reacts with silica-bearing minerals to form a mixture of calcium silicates. Over a billion tonnes of cement are made per year, and cement kilns are the key element of this production process: their capacity usually defines the capacity of the cement plant.
“Strommashina” is an outstanding manufacturer of cement kilns. Our high standards, together with more than 50 years of firing units manufacturing, make us one of the top rotary kiln manufacturers.
We can offer high quality firing equipment for different types of processes:
Dry process cement kilns
Сement kiln is a long cylinder rotating about its axis once every minute or two. The axis is inclined at a slight angle, the end with the burner being lower. The blended raw material enters the kiln via the pre-heater tower. Here, hot gases from the kiln, and probably the cooled clinker at the far end of the kiln, are used to heat the raw meal. As a result, the raw meal is already hot before it enters the kiln.
The dry process is much more thermally efficient than the wet process.
Wet process kilns
The original rotary cement kilns were called 'wet process' kilns. In their basic form they were relatively simple compared with modern developments. The raw meal was supplied at ambient temperature in the form of a slurry.
A wet process kiln may be up to 200m long and 6m in diameter. It has to be long because a lot of water has to be evaporated and the process of heat transfer is not very efficient.
To achieve consistent quality results, it is important to maintain a uniform product temperature at the kiln entry, mid zone, and discharge.