Plant Treatments of EAF Slag for its Use as Construction Materials

Abstract

At the steel plant of Höganäs Sweden AB, different steel grades were produced using an Electric Arc Furnaces (EAF). The slag tapped by the EAF often disintegrated during cooling. Slag fines from the disintegration are difficult to handle and to use as materials in construction. The plant tests of EAF slag treatments using stabilizer MCP-F of high P2O5 content were thus conducted, with 1st and 2nd campaign adding 10 and 20 kg MCP-F/ton slag, respectively. The MCP-F addition in slag pots and other test operations were carried out smoothly, without impacting the EAF steel production. Rates P2O5 recovery in the EAF slag were lower in some test heats. Studies may thus be carried out in future to increase the P2O5 recovery from MCP-F, hence, achieving a higher efficiency of stabilization treatments for the slag from the EAF plant.

Sustainable steel production – Swedish initiative to ‘close the loop’

“…Process developments towards the recovery of Fe and Mn from steel slags by oxidation-electromagnetic separation route were carried out successfully and nano manganese ferrites with optimized magnetic properties could be precipitated out of the slags by this innovative process (Ye et al 2013).…”

“…Theoretical investigations on a laboratory scale as well as industrial full-scale trials were conducted in order to present and develop scientifically based recommendations regarding slag compositions and handling processes with a view to making slag a marketable and valuable product. Several of the recommended techniques are today adopted and used by the Swedish steel industry (Yang et al 2008; Yang et al 2013).…”