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The production of high value pig iron nuggets from steelmaking by-products – A thermodynamic evaluation
Resources, Conservation and Recycling, Volume: 170, Start page: 105592
Swansea University Authors: Dan Stewart, Andrew Barron
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DOI (Published version): 10.1016/j.resconrec.2021.105592
Zinc contaminated steelmaking by-products such as blast furnace (BF) dust and basic oxygen steelmaking (BOS) dust present a significant recycling challenge at integrated steelmaking plants. Rotary Hearth Furnaces (RHFs) provide an attractive route for recovery of Fe and Zn from these materials throu...
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Zinc contaminated steelmaking by-products such as blast furnace (BF) dust and basic oxygen steelmaking (BOS) dust present a significant recycling challenge at integrated steelmaking plants. Rotary Hearth Furnaces (RHFs) provide an attractive route for recovery of Fe and Zn from these materials through carbothermal reduction of the oxides in the material to yield Direct Reduced Iron (DRI) and crude zinc oxide. The next generation of RHF processes such as ITmk3 and e-nugget produce pig iron nuggets from iron ore concentrates and coal, as iron and gangue separate in-situ without an additional melting unit. A computational study of the metal-slag system using FACTSAGE 7.3 suggests that production of pig iron nuggets of good quality (93.75 wt.% Fe, 4.3 wt.% C, 0.116 wt.% S, 0.66 wt.% Mn) can be produced from BF dust and BOS dust in a ratio of 37:63 with addition of 5.4 wt.% SiO2 and 1.51 wt% MgO at 1450 °C. These computational results are in good agreement with experimental studies on similar material and, as such, suggest a practically feasible process.
Ironmaking, Pig iron nugget, Recycling, Basic oxygen steelmaking dust, Blast furnace dust
Faculty of Science and Engineering
Financial support was provided by Materials and Manufacturing Academy (M2A) that has been made possible through funding from the European Social Fund via the Welsh Government, the Engineering and Physical Sciences Research Council (EPSRC), and Tata Steel Europe. Additional support is provided by the Reducing Industrial Carbon Emissions (RICE) operations funded by the Welsh European Funding Office (WEFO) through the Welsh Government.