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Calcination and Roasting - Practice Questions & MCQ

Edited By admin | Updated on Sep 18, 2023 18:35 AM | #JEE Main

Quick Facts

  • Conversion of ore into oxide - Calcination and Roasting is considered one the most difficult concept.

  • 32 Questions around this concept.

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QuestionEASY

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?

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During the metallurgical process of calcination:

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Calcination is the process of heating the ore:

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Roasting is usually performed in:

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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:

\mathrm{CaCO}_{3}\: \rightarrow \mathrm{CaO}+\mathrm{CO}_{2} \uparrow
Limestone        Calcium
                       oxide

\mathrm{Al}_{2} \mathrm{O}_{3}.\mathrm{H}_{2} \mathrm{O}\: \rightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{H}_{2} \mathrm{O} \uparrow
   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:

2 \mathrm{FeS}+3 \mathrm{O}_{2}\: \overset{\Delta }{\rightarrow}2 \mathrm{FeO}+2 \mathrm{SO}_{2}
Pyrite

2 \mathrm{HgS}+3 \mathrm{O}_{2} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{HgO}+2 \mathrm{SO}_{2}
Cinnabar

\mathrm{ZnS\: +\: 2O_{2}\: \overset{\Delta }{\rightarrow}\: ZnSO_{4}}
Zinc Sulphide

\mathrm{PbS}+2 \mathrm{O}_{2} \stackrel{\Delta}{\longrightarrow} \mathrm{PbSO}_{4}
Lead Sulphide

During roasting volatile impurities are removed, S, As, Sb are removed as SO2, As2O3, Sb2O3 respectively and sulphides ores are converted into their oxides.

NOTE: Both calcination and roasting occur in a mainly reverberatory furnaces.

Study other Related Concepts

Calcination and Roasting Current Topic

Metallurgy
Extraction of Metals: Ores and Minerals
Froth Floatation Process
Leaching Process
Cyanide Process
Calcination and Roasting
Flux and Slag
Ellingham Diagram
Refining Process Against Impurities

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