Question

The slag obtained during the extraction of copper pyrites is composed mainly of ${FeSiO}_3$.

• A. True
• B. False

Answer 1

The correct option is A True

Copper is mainly extracted from copper pyrites. After the concentration of its ore by froth flotation process, the ore is roasted in a current of air to remove arsenic, antimony and much of sulphur.

The ore is then mixed with a little coke and sand and smelted in a water-jacketed blast furnace. The minor reactions that occured during roasting continue here. Ferrous oxide combines with sand to form a fusible slag.

$FeO+Si{O}_2\to FeSi{O}_3$ slag