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Calcination and Roasting MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET
Quick Facts
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Conversion of ore into oxide - Calcination and Roasting is considered one the most difficult concept.
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7 Questions around this concept.
Solve by difficulty
Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with:
Concepts Covered - 0
Conversion of ore into oxide - Calcination and Roasting
Calcination
Calcination is the process of heating the ores below their melting points in absence of air to remove volatile impurities like water, CO2 and organic
matter etc.
For example:
Limestone Calcium
oxide
Bauxite Alumina
During calcination the ore becomes porous, volatile impurities are removed and carbonate ore decomposes into oxides.
Roasting
Roasting is the process of heating the ore in excess of air in order to convert metals into their oxides and water-insoluble sulphides into water-soluble sulphates. It is also called de-electronation of ores.
For example:
Pyrite
Cinnabar
Zinc Sulphide
Lead Sulphide
During roasting volatile impurities are removed, S, As, Sb are removed as SO2, As2O3, Sb2O3 respectively and sulphides ores arc converted into their oxides.
NOTE: Both calcination and roasting occur in mainly reverberatory furnace.
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