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Ores and Minerals

Which of the ...

Question

Which of the following statement is incorrect about the extraction of lead from galena?

A

Galena is a sulphide ore and therefore, it is concentrated by froth flotation process.

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B

Self reduction takes place in absence of air.

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C

Complete roasting of galena gives PbO which is then reduced by coke or CO to give metallic lead.

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D

F e S i O_{3}

is obtained as slag.

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Solution

The correct option is D $F e S i O_{3}$ is obtained as slag.
Galena (PbS) is a sulphide ore and sulphide ore are generally concentrated with froth floatation method.
Then self reduction takes place to obtain lead.
$P b S + 2 P b O \to 3 P b + S O_{2}$
Also, complete roasting of galena gives PbO which is then reduced by coke or CO to give metallic lead.
But $F e S i O_{3}$ is obtained as slag in the extraction of copper from copper pyrites.

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Q. Sulphide ores of metals are usually concentrated by Froth Flotation process. Which one of the following sulphide ores offers and exception and is concentrated by chemical leaching?

Q. Lead obtained from galena ore (PbS) by air reduction or carbon reduction process contains base metal (Cu, Bi, As, Sn, Zn) as impurities. The removal of the impurity of Ag from the commercial lead is called:

Reduction to free metal: some of the methods commonly used to get free metal from the concentrates ore are below.

Smelting: The process of extracting a metal in the state of fusions is called smelting. In this process the ore is mixed with carbon and heated in suitable furnace

Electrolytic reduction process: This process is used in the extraction of the alkali and alkaline earth metals, zinc and aluminium.

Self reduction process: The sulphide ores of less electropositive metals like Hg, Pb, Cu etc., are heated in air so asto convert part of the ore into oxide or sulphate which then reacts with the remaining sulphide ore to give the metal.

After partial roasting, the sulphide of copper is reduced by :

Q. What is the appropriate order of processes for the extraction of lead from Galena?
A) Froth flotation B) Calcination C) Roasting D) Self Reduction E) Electrolytic Reduction F) Smelting

Lead is extracted from its chief ore galena by both carbon reduction as well as self-reduction.

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