Medium
In the extraction of copper,its sulphide ore is heated in a reverberatory furnace after mixing with silica to:
- Aseparate $CuO$ as $CuSiO_3$
- Bremove calcium as $CaSiO_3$
- Cdecrease the temperature needed for roasting of $Cu_2S$
- Dremove $FeO$ as $FeSiO_3$
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