Modification of industrial BOF slag: Formation of MgFe2O4 and recycling of iron

摘要: Abstract Efficient recycling of iron oxide from industrial BOF (basic oxygen furnace) slags has always been an issue in metallurgy. In this study, a new method was developed for the efficient oxide: It transformed into magnesioferrite spinel (MgFe2O4) by mixing slag with 6.00% SiO2 first, and then modified got cooled down 1400 °C to 1270 °C at rate 1 °C/min. Finally, Fe resources were recycled magnetic separation. Various experiments analyses such as XRD, SEM–EDS analyses, Factsage thermodynamic simulation, magnetization characterization, dry separation, chemical analysis carried out. The results show that obtained MgFe2O4 high melting point (1716.76 °C theory) ferromagnetism (specific susceptibility (8.03–206.84) × 10−5 m3/kg). Therefore, it could be separated weakly (0.024–0.136) × 10−5 m3/kg). Furthermore, applied different slags. yield increased above 80% when content Fe2O3 range 25.81–46.90%. After modification total 15.80%, 21.20% 37.00% slag. This is better than direct separation without any treatment. reused either sintering or splashing material. nonmagnetic can used produce value-added building materials. Hence, recycle slags, achieving sustainable development steel industry.