Distribution behavior of chromium and sulfur elements during co-treatment of vanadium extraction tailings and red mud
The process of blast furnace iron-oxygen top blowing converter blowing vanadium extraction-vanadium slag followed by sodium roasting-water leaching and vanadium extraction will form vana-dium tailings containing 30％～40％Cr2O3,forming an annual accumulation of millions of tons of solid waste.In this study,the vanadium tailings were extracted by synergistic reduction of high-iron red mud,and the Fe2O3 in the red mud was reduced by carbon at a temperature lower than the initial reduction temperature of chromium oxide,which promoted the rapid progress of chromium reduction and im-proved the recovery efficiency of Cr.The whole reaction system was simulated by FactSage thermody-namic software,and the effects of the chromium iron ratio,slag alkalinity and C/Si content on the parti-tion behavior of chromium and sulfur were calculated.The suitable Cr/Fe ratio of the raw materials was 0.18,the alkalinity of the slag was 1.8,the amount of carbon was nC/O=1.1,and the amount of Si was nSi/O=0.2.This study provides a new feasible scheme for the resource treatment and value-added applic-ation of Cr-containing vanadium tailings and high-iron red mud.
vanadium residue removal disposalhigh iron red mudsynergistic reductionchromium extractiondesulfurizationthermodynamic calculation
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