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Question
Why copper matte is put in silica lined converter?
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Solution
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.
\[\ce{2FeS + 3O2 -> 2FeO + 2SO2}\]
\[\ce{FeO + SiO2 -> FeSiO3}\]
\[\ce{2Cu2S + 3O2 -> 2Cu2O + 2SO2}\]
\[\ce{2Cu2O + Cu2S -> 6Cu + SO2}\]
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