In the smelting of roasted copper pyrites ore | vedclass

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Question

(D) During the smelting of roasted copper pyrites $(CuFeS_2)$,the ore is heated with silica $(SiO_2)$ and coke. Iron has a higher affinity for sulphur

Vedclass · Accepted Answer

All the sulphur preferentially combines with iron to form $FeS$ and $FeO$ is formed

Vedclass · Answer

(D) During the smelting of roasted copper pyrites $(CuFeS_2)$,the ore is heated with silica $(SiO_2)$ and coke. Iron has a higher affinity for sulphur than copper. Therefore,the sulphur preferentially combines with iron to form ferrous sulphide $(FeS)$. The remaining copper forms cuprous sulphide $(Cu_2S)$. The iron sulphide $(FeS)$ is then oxidized to ferrous oxide $(FeO)$,which reacts with silica to form slag $(FeSiO_3)$. The primary reaction is: $2CuFeS_2 + O_2 \rightarrow Cu_2S + 2FeS + SO_2$.

In the smelting of roasted copper pyrites ore,melting occurs so that the first reaction is:

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