1.

State oftherole ofsilicain themetallurgyofcopper.

Answer»

SOLUTION :During roasting, copperpyrites are convertedintoamixtureofFeOand`Cu_ 2O`.
`""underset ("Copper pyrites")(2CuFeS_2 )+O _ 2overset (Delta) toCu_2S +2Fe S +SO _ 2`
`""2Cu_ 2S+3O _ 2overset (Delta ) to2 Cu_ 2O+2 SO _ 2and2 FES +3 O _ 2to2 FeS +3O _ 2to2 FeO+2 SO _2 `
ToremoveFeO(basic ), an acidicflux silicaisaddedduringsmelting. FeOthen combineswith` SiO _ 2`toformferroussilicate` (FeSiO_ 3 ) `slag whichfloatsover moltenmatteand hencecan beeasilyremoved
`"" FeO+underset ("FLUX")(SiO_2) tounderset ("Slag")(FeSiO_3) `
Thus,therole ofsilica inmetallurgyofcopperis toremoveferrous OXIDE as ferroussilicateslag.


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