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Why is sulphide ore of copper heated in ...

Why is sulphide ore of copper heated in a furnace afer mixing with silica?

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Iron oxide present as impurity in sulphide ore of copper forms slag which is iron silicate and copper is produced in the form of copper matte.
`FeO + SiO_2 to FeSi O_3`
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MODERN PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-NCERT FILE (Ncert Exemplar Problems) (Short Answer Type Questions)
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