High-basicity coal-bearing iron oxide briquettes with a CaO/SiO2 of 2.0 and a C/O molar ratio of 1.1 to 1.2,which were produced by BOF steelmaking sludge,BF dedusting ash and pyrite cinder,were self-reduced at temperatures from 1 330 ℃ to 1 380 ℃ to study the phenomena of desulfurization and dephosphorization.During the self-reduction,the desulfurization ratio by evaporating as COS is 20% to 40%.Residual sulphur is attached in slag and it can be separated from iron nuggets.The total desulfurization ratio is...