Calcination is a process where a material, like an ore or solid substance, is heated to a high temperature.
This is done in the absence or with limited supply of air or oxygen.
The main goal of calcination is to cause thermal decomposition, remove volatile components, or induce a phase transition in the material.
How is Calcination Process Performed? 5 Key Steps Explained
1. Heating in Calcination Furnaces
Calcination is usually carried out in specialized furnaces called calcination furnaces.
These can be of different types, such as muffle, reverberatory, or shaft furnaces, or even kilns.
These furnaces are heated to temperatures ranging from 800°C to 1300°C, depending on the specific application.
2. Controlled Thermal Profiles
The calcination process often involves tight thermal profiles with strict tolerances.
This ensures that the desired outcome is achieved.
3. Stirring for Uniformity
During the calcination process, the material is often stirred.
This helps to ensure uniformity in the final product.
4. Removing Volatile Components
The main objectives of calcination include driving off water or moisture present in the material.
It also involves removing volatile constituents like carbon dioxide.
In some cases, it may involve oxidizing part or all of the substance.
5. Different Fuel Sources
Different types of calcination furnaces use various fuel sources such as electricity, gas, or oil.
The choice of fuel depends on the specific requirements of the application.
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