A) \[\text{FeSi}{{\text{O}}_{\text{3}}}\]as fusible slag and \[\text{C}{{\text{u}}_{\text{2}}}\text{S}\]as matte
B) \[\text{CaSi}{{\text{O}}_{3}}\]as infusible slag and \[\text{C}{{\text{u}}_{\text{2}}}\text{O}\]as matte
C) \[\text{C}{{\text{a}}_{3}}{{(P{{O}_{4}})}_{2}}\]as fusible slag and \[\text{C}{{\text{u}}_{\text{2}}}\text{S}\]as matte
D) \[F{{e}_{3}}{{(P{{O}_{4}})}_{2}}\]as infusible slag and \[\text{C}{{\text{u}}_{\text{2}}}\text{S}\]as matte
Correct Answer: A
Solution :
Roasted copper pyrite on smelting with sand produces \[\text{FeSi}{{\text{O}}_{\text{3}}}\]as fusible slag and \[C{{u}_{2}}S\]as matte. For removing the gangue, \[\text{Fes,}\]silica present in the lining of the Bessemer converter, acts as a flux and forms slag (iron silicate) on reaction with FeO. \[\underset{Gangue}{\mathop{FeS}}\,+3{{O}_{2}}\xrightarrow{{}}2FeO+2S{{O}_{2}}\] \[\underset{Gangue}{\mathop{FeO}}\,\,+\,Si{{O}_{2}}\xrightarrow{{}}\underset{Slag}{\mathop{FeSi{{O}_{3}}}}\,\] Copper matte mainly contains \[C{{u}_{2}}S\]and FeS.
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