The calcination process is a crucial step in cement production.
It typically takes about 30 minutes in a rotary kiln.
During this time, the material is heated to approximately 1500 °C.
This high temperature converts the material into clinker.
Before reaching the rotary kiln, the raw meal undergoes preheating and partial calcination.
This preheating stage occurs in a precalciner vessel.
About 90% of the limestone is decarbonated in just a few seconds.
The calcination process involves heating the material to a high temperature.
The goal is chemical dissociation.
In cement production, raw materials are first ground and homogenized.
These materials are then introduced into the top of the preheater tower.
They pass through a series of cyclones.
The material is flash heated to around 900 °C in the precalciner vessel.
Despite the short residence time in the precalciner, it is enough to decarbonate most of the limestone.
After precalcination, the material enters the rotary kiln.
Here, it is heated to approximately 1500 °C.
The tumbling action and partial melting in the kiln facilitate the conversion into clinker.
The residence time in the rotary kiln is about 30 minutes.
This is the duration of the calcination process.
Following calcination, the clinker is cooled in a cooler.
It is then ground with gypsum to produce cement.
The air used to cool the clinker is also utilized as preheated combustion air.
This enhances the thermal efficiency of the process.
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