Question

In the extraction of copper, its sulphide ore is heated in a reverberatory furnace after mixing with silica to:

• A. remove $FeO$ as $FeSiO _3$
• B. separate $CuO$ as $CuSiO _3$
• C. decrease the temperature needed for roasting of $Cu _2 S$
• D. remove calcium as $CaSiO _3$

Answer 1

Answer: (A)

remove $FeO$ as $FeSiO _3$

Answer 2

The copper ore contains iron, it is mixed with silica before heating in reverberatory furnace. FeO slags off as FeSiO3​.
FeO+SiO2​⟶FeSiO3​