Calcination is the process in which:
- ore is heated above its melting point to expel $H_2O$ or $CO_2$ or $SO_2$
- ore is heated below its melting point to expel volatile impurities
- ore is heated above its melting point to remove $S, As$ and $Sb$ as $SO_2$, $As_2O_3$ and $Sb_2O_3$ respectively
- ore is heated below its melting point to expel $H_2O$ or $CO_2$
The Correct Option is D
Solution and Explanation
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Concepts Used:
General Principles and Processes of Isolation of Elements
What are Ores and Minerals?
Minerals are the naturally occurring, homogeneous inorganic solid substances. They are having a definite chemical composition and crystalline structure, hardness and color. For example, copper pyrite, calamine, etc.
Impurities in an ore are called gauge. The removal of a gauge from the ore is called concentration ore.
Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –
- Concentration of the ore
- Isolation of the metal from its concentrated ore
- Purification of the metal