Laboratory Studies on the Effect of End-of-Life Rubber Tyre Blending with Metallurgical Coke on Slag Foaming in Electric Arc Furnace Steelmaking
Abstract
Currently, less than 20% of end-of-life rubber tyres (ELTs) are recycled globally and it is believed that an estimated 4 billion ELTs are currently held in various stockpiles across the globe. In this work the effect of ELT blending with metallurgical coke on slag foaming phenomena in the electric arc furnace (EAF) was investigated in a laboratory scale horizontal tube furnace through the sessile drop approach. Cylindrical substrates of carbonaceous materials were formed from a Drop Tube Furnace-treated metallurgical coke and its blends with ELT. The substrates were then used for slag foaming studies in a horizontal tube furnace by measuring the ratio (Vt/Vo) of volume at time t (Vt) to the initial volume (Vo) as a function of time for various blends, using 0.065 g of pulverised EAF slag (47.1 wt % FeO). The results showed improvement in slag foaming with ELT blending, based on the measured values of (Vt/Vo). Slag foaming therefore presents another avenue for recycling the billions of ELTs currently disposed of illegally or held in various stockpiles across the Globe.
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