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Silica is added to the sulphide ore of copper in the reverberatory furnace.

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Copper pyrites contain iron sulphide in addition to copper sulphide. in the reverberatory furnace, copper ore is roasted to give oxides. FeO is removed by adding silica from the matte containing Cu2S and FeS.

2FeS+3O2  2FeO+2SO2

FeO+SiO2 FeSiO3(Slag)

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