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  • Which among the following reactions are involved in extraction of copper from chalcopyrite?Option: 1 <img alt="\begin{aligned} & \mathrm{FeO}+\ma

Which among the following reactions are involved in extraction of copper from chalcopyrite?

Option: 1

\begin{aligned} & \mathrm{FeO}+\mathrm{SiO}_2 \rightarrow \mathrm{FeSiO}_3(\text { slag }) \\ \end{aligned}


Option: 2

2 \mathrm{Cu}_2 \mathrm{O}+\mathrm{Cu}_2 \mathrm{~S} \rightarrow 6 \mathrm{Cu}+\mathrm{SO}_2 \\


Option: 3

2 \mathrm{Cu}_2 \mathrm{~S}+3 \mathrm{O}_2 \rightarrow 2 \mathrm{Cu}_2 \mathrm{O}+2 \mathrm{SO}_2


Option: 4

All of the above


Answers (1)

best_answer

The chalcopyrite ore is \mathrm{CuFeS_{2}}. The concentrated copper oxide ore from roasting method will have iron impurities.
Roasting: 2 \mathrm{Cu}_2 \mathrm{~S}+3 \mathrm{O}_2 \rightarrow 2 \mathrm{Cu}_2 \mathrm{O}+2 \mathrm{SO}_2

The concentrated ore is mixed with silica and heated in reverberatory furnace to get copper matte. 

Silica is added to Copper matte followed by hot air blast. It converts impurities such as FeS and FeO into slag. Whereas Copper present in \mathrm{Cu_{2}S/ Cu_{2}O} is extracted. 

The various reactions involved in extraction of copper from cuprous oxide are:

\begin{aligned} & 2 \mathrm{FeS}+3 \mathrm{O}_2 \rightarrow 2 \mathrm{FeO}+2 \mathrm{SO}_2 \\ & \mathrm{FeO}+\mathrm{SiO}_2 \rightarrow \mathrm{FeSiO}_3(\mathrm{slag}) \\ & 2 \mathrm{Cu}_2 \mathrm{O}+\mathrm{Cu}_2 \mathrm{~S} \rightarrow 6 \mathrm{Cu}+\mathrm{SO}_2 \end{aligned}

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