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Question
Explain the following:
Silica is added to the sulphide ore of copper in the reverberatory furnace.
Solution
Copper pyrites contain iron sulphide in addition to copper sulphide. In the reverberatory furnace copper ore is roasted to give oxides. \[\ce{FeO}\] is removed by adding silica from the matte containing \[\ce{Cu2S}\] and \[\ce{FeS}\].
\[\ce{2FeS + 3O2 -> 2FeO + 2SO2}\]
\[\ce{Feo + SiO2 -> \underset{(Slag)}{FeSiO3}}\]
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