Thermal treatment processes are crucial in the metallurgical industry.
They help in transforming raw materials into useful products.
Two such processes are calcination and roasting.
Understanding their differences can help in choosing the right process for specific applications.
What is the difference between two thermal treatment processes calcination and roasting? (5 Key Differences)
1. Presence of Air or Oxygen
Calcination is a process that involves heating ore without the presence of air or with only a small amount of air.
Roasting, on the other hand, involves heating ore in the presence of air or oxygen.
2. Purpose of the Process
Calcination is mainly used to thermally decompose carbonate ores and remove volatile impurities.
Roasting is used to oxidize or reduce the ore, depending on the desired outcome.
3. Temperature Range
In calcination, the ore is heated to a temperature below its melting point.
Roasting also involves heating to a temperature below the melting point, but in the presence of air or oxygen.
4. Chemical Reactions
Calcination causes the release of carbon dioxide gas and the conversion of carbonate minerals into their corresponding oxides.
Roasting involves the reaction of the ore with oxygen, resulting in the release of gases and the formation of solid metal oxides.
5. Applications
Calcination is commonly used in the production of lime from limestone.
Roasting is used to remove volatile impurities, convert sulfide ores into oxides, or promote the formation of metal oxides.
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