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Extraction of Iron

Why is sulphi...

Question

Why is sulphide ore of copper heated in a furnance after mixing with silica?

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Solution

Silica (flux) being an acidic flux removes the impurities of iron oxide the basic impurity, by reacting with it. Thus, iron silicate (slag) is formed.
$F e O G a n g u e + S i O_{2} F l u x ⟶ F e S i O_{3} S l a g$

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