Co-modification of metallurgical slags to recover valuable metals by carbothermal reduction
For the effective recovery of valuable metals in metallurgical slags,a novel co-modification method between BOF and copper slag was proposed. The phase reconstruction laws and element separation characteristics during the co-modification and carbothermal reduction process of BOF and copper slag were investigated through high-temperature experiments. The effects of the basicity[w( CaO)/w( SiO2 )]of modification,reduction temperature,and molar ratio of carbon and oxygen[n ( C )/n ( O )]on the metal recovery rate were also investigated. The results show that the interaction between BOF and copper slag increases the activity of iron oxides in the modified slag. Moreover,under the optimal process conditions of modification basicity of 1.25,reduction temperature of 1550℃,and n(C)/n(O)=1.2,an alloy can be recovered with Fe,Cu,P,and Mn contents of 93.19％,3.81％,0.12％,and 0.10％,respectively.
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