Calcination is a process that involves heating ore strongly below its melting point.
This can be done either in the absence of air or with a limited supply of air.
The primary purpose of calcination is to convert carbonates and hydroxides into their respective oxides.
7 Key Points to Know About the Process of Calcination of Ores
1. Purpose of Calcination
Calcination is commonly used to remove impurities from metal ores.
2. Effects of Calcination
This process allows for the removal of volatile fractions and induces phase transitions.
3. Types of Calcination Furnaces
Calcination furnaces are used for this process and can vary in configuration.
Common types include muffle, reverberatory, and shaft furnaces or kilns.
4. Temperature Range
The temperature range for calcination is typically between 800°C to 1300°C.
5. Importance of Thermal Profiles
It is important to maintain tight thermal profiles with strict tolerances to ensure uniformity in the final product.
6. Difference Between Calcination and Sintering
While both processes involve heating a metallic material to a temperature below its melting point, calcination focuses on removing impurities, while sintering aims to weld together small particles of a metal.
7. Applications of Calcination
Calcination has various applications in different industries.
For example, ashing furnaces are used in the food industry to estimate the mineral content of food samples.
In the petroleum industry, ashing furnaces are used to test the combustibility of products and crude oil.
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