EXPERIMENTAL STUDY OF MICROALLOYING IN STEELMAKING WITH IRON VANADIUM MUD
Iron vanadium mud is a kind of vanadium containing waste produced in the purification and removal extraction process after sodium roasting of vanadium slag,containing a large amount of vanadium,chromium and other valuable metals.It is both a hazardous environmental pollutant and a valuable strategic resource.In this paper,iron vanadium mud was directly returned to steelmaking to carry out microalloying experimental research.The results showed that the average weight loss rate of hydrous iron vanadate mud after drying is 52.83％,and the vanadium content in the iron vanadium mud accounts for 25.29％,mainly FeVO4;the thermodynamic equilibrium calculations proved the feasibility of experimental design and vanadium microalloying.In microalloying,iron,vanadium,chromium oxides and reductants react in the order of Fe2O3＞V2O5＞Cr2O3,and iron vanadium mud can effectively increase the vanadium and chromium content in steel.When the amount of iron vanadate mud was fixed,the addition of additional reductant silicon was conducive to improve the vanadium incremental rate,the test vanadium incremental rate up to 79％.However,an excess of reductant silicon will inhibit the carbon reduction reaction and reduce the vanadium incremental rate.The reaction time in the test has no effect on the microalloying,and it is considered that the reaction time up to 10 min has been reacted completely.By regulating the amount of iron vanadium mud and using aluminum as a reductant,the test vanadium incremental rate was significantly increased,up to 91.35％.In addition,the study concluded that the process of iron vanadium mud microalloying could be divided into five steps,and elucidated the microalloying mechanism of iron vanadate mud for steelmaking,effectively improved the recovery rate of vanadium in the mud.
iron vanadium mudmicroalloyingvanadium incremental ratealuminumsilicon
NETL
NSTL
万方数据
