Roasting of copper pyrites is done:

to remove moisture and volatile impurities

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to oxidise free sulphur

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to decompose pyrites into

{C u}_{2} S

and

F e S

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to decompose

{C u}_{2} S

into blister copper

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Solution

The correct options are
A to remove moisture and volatile impurities
B to oxidise free sulphur
C to decompose pyrites into ${C u}_{2} S$ and $F e S$
During roasting of copper pyrite ore:
(A) moisture is removed and sulphur, arsenic and antimony are removed in the form of their volatile oxides.
(B) Free sulphur is oxidized to sulphur dioxide.
(C) Coppr pyrite decomposes into cuprous sulphide and ferrous sulphide.
Thus options A, B and C are correct.
(D) Cuprous sulphide is decomposed into blister copper during bessemerisation.
Thus option D is incorrect.

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Similar questions

Q. Copper is extracted from 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 thrown into the mixture to obtain blister copper which is purified by electrorefining.

During roasting, copper pyrites are ultimately converted into a mixture of:

When copper pyrite is roasted in excess of air, a mixture of $C u_{2} S$ and $F e O$ are formed. FeO is present as impurity. This can be removed as slag during Smelting. The flux added to form slag is

Q. Balanced equations for "the extraction of copper from copper pyrites by self-reduction." is :

C u_{2} S + 2 C u_{2} O \to 6 C u + S o_{2}

If the given statement is true enter 1 else 0.

Q. Roasting of copper pyrites ores is for the following purposes:

Q. Why does copper obtained in the extraction from copper pyrites have a blistered appearance?

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