The calcination process involves heating solids to high temperatures for various purposes.
It can be used for removing volatile substances, oxidizing a portion of the mass, or making the material friable.
Calcination is often considered a process of purification.
What is the Calcination Process? 7 Key Points to Understand
1. Heating Below Melting Point
In the calcination process, solid materials like ores are heated below their melting point.
This is usually done in the absence or with a limited supply of air.
2. Thermal Decomposition
Heating induces thermal decomposition, the removal of a volatile fraction, or phase transition.
3. Temperature Range
The temperature at which calcination occurs can vary.
It typically ranges from 800°C to 1300°C depending on the specific application.
4. Calcination Furnaces
Calcination furnaces are commonly used for this process.
These furnaces can have different configurations, such as muffle, reverberatory, or shaft furnaces or kilns.
5. Stirring for Uniformity
When a sample is being calcinated, it is often stirred to ensure uniformity in the final product.
6. Difference from Sintering
Calcination is different from sintering, another pyrometallurgical process.
Calcination involves heating a metal ore to remove impurities.
Sintering involves heating a metal ore to weld together small particles of a metal.
7. Example: Lime Production
One example of calcination is the production of lime from limestone.
In this process, limestone is heated to a high temperature, causing it to release carbon dioxide gas and form lime in an easily powdered condition.
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