What do you understand by the following terms: (i) Roasting, (ii) Calcination, (iii) Smelting?

Solution

i) Roasting: In roasting, the ore is heated in aregular supply of air in a furnace at a temperature below the melting point of the metal. For example:

2ZnS + 3O₂ → 2ZnO + 2SO₂
2PbS + 3O₂ → 2PbO + 2SO₂

2Cu₂S + 3O₂ → 2Cu₂O + 2SO₂

ii) Calcination: Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of metal.

Fe₂O₃.xH₂O(s)+heat → Fe₂O₃ (s) + xH₂O(g)

ZnCO₃ (s) +heat → ZnO(s) + CO₂(g)

Some More Questions From General Principles And Processes of Isolation Of Elements Chapter

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General Principles And Processes Of Isolation Of Elements

What do you understand by the following terms: (i) Roasting, (ii) Calcination, (iii) Smelting?

Some More Questions From General Principles And Processes of Isolation Of Elements Chapter

Which of the ores mentioned in Table 6.1. could be concentrated by magnetic separation method?
Table 6.1 Principal ores of some important metal.

What is the significance of leaching in the extraction of aluminium?

Is it true that under certain conditions. Mg can reduce Al₂O₃and Al can reduce MgO? What are those conditions?

What is the role of depressant in froth floatation process?

Titanium is a metal of modern times. It is obtained as oxide. Why it could not be extracted earlier despite its wide occurence?

Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?

What criterion is followed for the selection of the stationary phase in chromatography?

What is the role of cryolite in the metallurgy of aluminium?

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General Principles And Processes Of Isolation Of Elements

What do you understand by the following terms: (i) Roasting, (ii) Calcination, (iii) Smelting?

Some More Questions From General Principles And Processes of Isolation Of Elements Chapter

Which of the ores mentioned in Table 6.1. could be concentrated by magnetic separation method?Table 6.1 Principal ores of some important metal.

What is the significance of leaching in the extraction of aluminium?

Is it true that under certain conditions. Mg can reduce Al2O3 and Al can reduce MgO? What are those conditions?

What is the role of depressant in froth floatation process?

Titanium is a metal of modern times. It is obtained as oxide. Why it could not be extracted earlier despite its wide occurence?

Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?

What criterion is followed for the selection of the stationary phase in chromatography?

What is the role of cryolite in the metallurgy of aluminium?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Which of the ores mentioned in Table 6.1. could be concentrated by magnetic separation method?
Table 6.1 Principal ores of some important metal.

Is it true that under certain conditions. Mg can reduce Al₂O₃and Al can reduce MgO? What are those conditions?