Recycling application BF slag used as aggregates of various construction projects BOF slag 16.5 83.5 After entrapped metal recovery, part of this was used as internal raw material in the sinter plants and others for asphalt concrete and concrete agent materials De-S slag 0.0 100.0 After metal recovery, the residues were used as materials for land amendment, temporary roads, soil improvement and low strength concrete and concrete materials.