To study the influence of process parameters on the carbon-thermal reduction of steel slag and determine the optimal process conditions,Baotou Steel's hot splashing slag and production coke particles as raw materials were used to study the influence of process parameters on carbon thermal reduction of steel slag through four factors and four levels of orthogonal experiments with different coke slag ratios,alkalinity,reduction temperature,and time.The optimal parameters for reducing slag iron recovery rate and pulverization rate were determined through range analysis and verified.The results show that the factors which affect the iron recovery rate after slag reduction are the coke slag ratio,reduction temperature,alkalinity,and insulation time.The optimal horizontal combination is a coke slag ratio of 10∶90,an experimental temperature of 1 600 ℃,an alkalinity condition of 1.8,and an insulation time of 50 min.The iron recovery rate after slag reduction can reach 59.67％;the factors that affect the 100-mesh screening rate of the powder after slag reduction are the coke slag ratio,alkalinity,reduction temperature,and insulation time.The optimal combination of levels is a coke slag ratio of 25∶75,an experimental temperature of 1 450 ℃,an alkalinity condition of 2.2,and an insulation time of 30 min.The 100-mesh screening rate of the powder after slag reduction is 78.08％,which is the highest level in all experiments;under the experimental conditions of a coke to slag ratio of 25∶75,reduction temperature of 1 550 ℃,alkalinity of 2.0,and insulation for 60 min,the iron recovery rate and 100-mesh screening rate of the slag sample after reduction are both good,reaching 47.18％and 43.83％,respectively.
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