The feasibility of processing electric arc furnace (EAF), basic oxygen furnace (BOF) and ladle metallurgy furnace (LMF) slags for metal recovery and carbon dioxide sequestration was evaluated using a combination of grindability and sequestration tests on industrial slags and modeling studies using METSIM. Power consumption, slag-carbon dioxide capture, and metal recovery all increased inversely to grind size (P_(80)) within the range of 50-1,000 mu m. The optimum grind size was determined based on a calculated process net value using commodity indexes. EAF and BOF slags exhibited sharp maximum values at 110-120 mu m, with a rapid decrease at larger or smaller sizes due to increased power consumption or decreased metal recovery. LMF slag exhibited much less sensitivity to grind size, with approx 3 percent variation from its peak size of 370 mu m over most of the studied range. All slags showed net positive carbon dioxide sequestration benefits based on slag capture and generation by the power supply source.
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