Why copper matte is put in silica lined converter?
Copper matte contains Cu2S and FeS. Copper matte is put in a silica-lined converter to remove the remaining FeO and FeS present in the matte as slag (FeSiO3). Also, some silica is added to the silica-lined converter. Then, a hot air blast is blown. As a result, the remaining FeS and FeO are converted to iron silicate (FeSiO3) and Cu2S is converted into metallic copper.
`2FeS + 3O_2 -> 2FeO + 2SO_2`
`FeO + SiO_2 -> FeSiO_3`
`2Cu_2S + 3O_2 -> 2Cu_2O+2SO_2`
`2Cu_2O +Cu_2S -> 6Cu +SO_2`
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