A Novel Process for Separation of Magnetite and Phosphorous Phases from a CaO–SiO2–FeO–P2O5 Slag

Iron and phosphorus were successfully separated from CaO– SiO 2 –FeO–P 2 O 5 slag through atmospheric control, B 2 O 3 addition and a combination of magnetic separation and flotation. For the slag with basicity (CaO/SiO 2 ) of 2.5 and B 2 O 3 addition of 6% (weight percentage), iron and phosphorus in the slag were enriched in the form of magnetite (Fe 3 O 4 ) and calcium phosphate (Ca 10 P 6 O 25 ) phases respectively under Ar atmosphere. Using a combination of magnetic separation and flotation, the concentrates were obtained with Fe 3 O 4 and P 2 O 5 content of 92.84% and 37.66% respectively, corresponding to the recovery ratios of 85.8% for iron and 91.3%

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