FeO

FeSiO₃

MgSiO₃

CaSiO₃

A reducing agent

Flux

Slag

Gangue

Cu and Hg

Zn and Hg

Cu and Al

Fe and Pb

It is not affected by acids

It gives oxygen on heating

It melts at very high temperature

If has no effect of electricity

SiO₂

Fe₂O₃

K₂SO₄

NaF