The recovery of metal oxides from stainless steel dust using C (graphite), SiFe, and Al as reductants was investigated under various conditions. The apparent distribution ratio of Cr ( m/s Cr L ′ ) in the recovered metal and residual slag phases was defined as the major performance metric. The results show that the recovery ratio of metals increases as the ratio of CaO:SiO 2 by mass in the residual slag increases to 1.17. The residual content of metals in the slag decreases as the Al 2 O 3 content of the slag is increased from approximately 8wt% to 10wt%. The recovery ratio of Cr increases with increasing m/s Cr L ′ , and a linear relationship between m/s Cr L ′ and the activity coefficient ratio of CrO in the slag and the recovered metal phase is observed. The combination of C and SiFe or Al as the reducing agents reveals that Si is the more effective coreductant.
Nomenclature
B:Basicity of the residual slag, which is defined as B = [(%CaO) + (%MgO)]/[ (%Al 2 O 3 ) + (%SiO 2 )]; :
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