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Assertion: In extraction of copper from ...

Assertion: In extraction of copper from chalcopyrite after roasting in supply of air ai moderate temperature, the temperature of the roasting ore is increased above the fusion temperature and then silica is added in reverberatory furnace.
Reason: In the extraction of copper from chalcopyrites during smelting, the impurity of iron is removed as fusible slag `(FeSIO_(3))` in blast furnace or reverberatory furnace.

A

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explantion for Statement-1.

B

Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explantion for Statement-1.

C

Statement-1 is True, Statement-2 is False.

D

Statement-1 is True, Statement-2 is True.

Text Solution

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The correct Answer is:
D
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Assertion: Silica is added as a flux in reverberatory furnace, in the extrcation of copper from copper phyrites. Reason: Silica decreases the melting point of the ore and increases the conductivity.

Select and write the most appropriate answer from the given alternatives for each sub-question: Silica is added to roasted copper ore during smelting process to remove :

Extraction of copper is done using copper pyrites. After roasting, the ore is mixed with silica and coke and then smelted in a blast furnace. The matte obtained from the blast furnace is charged into a silica-lined converter. Some silica is also added, and a hot air blast is blown into the mixture to obtain blister copper, which is purified by electrorefining. Matte is a mixture of