Silica is added to roasted copper ores during | vedclass

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Question

(B) Silica $(SiO_2)$ is added during the smelting process to remove iron oxide $(FeO)$ impurities present in the roasted copper ore.During roasting,ir

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ferrous oxide

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(B) Silica $(SiO_2)$ is added during the smelting process to remove iron oxide $(FeO)$ impurities present in the roasted copper ore.During roasting,iron sulfides present in the ore react with oxygen to form iron oxides $(FeO)$.$2FeS + 3O_2 ightarrow 2FeO + 2SO_2$Silica acts as an acidic flux and reacts with the basic impurity $FeO$ to form a fusible slag,iron silicate ($FeSiO_3$ or $FeO \cdot SiO_2$).$FeO + SiO_2 ightarrow FeSiO_3 	ext{ (slag)}$This slag is less dense than the molten matte and can be easily removed.

Silica is added to roasted copper ores during extraction in order to remove

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