With the development of the stainless steel industry,there emerges an urgent need to process large amounts of stainless steel dust and sludge.This stainless steel dust and sludge contains harmful elements such as K,Na,Pb,Zn,and S,which can negatively impact the environment when recycled back into the main production process.Effective removal of these harmful elements during the preparation of pre-reduced pellets from stainless steel dust and sludge can significantly reduce their presence in a closed-loop process,marking a significant step towards the resourceful utilization of stainless steel dust and sludge.Researchers draw on coal-based direct reduction processes to investigate the behavior of harmful element removal during the preheating,the oxidation roasting,and the coal-based pre-reduction of stainless steel dust and sludge pellets,and to optimize the parameters of the removal process.Under optimal pre-reduction conditions(C/Fe mass ratio of 2,the reduction temperature of 1250℃,and the reduction time of 80min)the removal rates for harmful elements K,Na,Pb,Zn,and S reached 95.47%,55.14%,98.13%,94.27%,and 65.57%respectively.The pre-reduced pellets achieved a compressive strength of 555N per pellet and a metallization rate of 86.48%,making them suitable as feedstock for stainless steel electric furnace smelting and achieving resourceful treatment of stainless steel dust and sludge.
stainless steel dust and sludgeoxidation roastingcoal-based reductionremoval of harmful elements
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