When copper pyrite is roasted in excess of air, a mixture of Cu2S and FeO are

Discussion Forum : General Principles And Process Of Isolation Of Elements

Question -

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

Options:

A . Silica which is an acidic flux

B . Limestone, which is a basic flux

C .

S i O_{2}

which is a basic flux

D . CaO which is a basic flux

Answer: Option A
:
A

FeO (Basic gangue) impurity is mixed with $S i O_{2}$ (acidic flux) to form a fusible slag

$F e O$ $+ S i O_{2}$ $\to$ $F e S i O_{3}$

(slag)

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