Thermodynamics and Kinetics of the Reduction for Acid Vanadium-titanium Slags in Electric Furnace
|Course||Iron and steel metallurgy|
|Keywords||Acidic vanadium titanium slag Reduction reaction Slag phase phase SEM|
In this paper, the acidic vanadium - titanium slag furnace reduction process , Thermodynamics of vanadium allocation of molten iron and slag . And thermodynamic studies based on the the vanadium titanium slag reduction kinetics studies . Also investigated the phase composition of vanadium titanate slag reduction process , microscopic form of evolution, as well as V, Ti , and other elements of the change of the mode of occurrence in the slag . In this paper, the analysis of vanadium-containing titanium slag reduction reaction research situation at home and abroad based on acid residue, use the synthetic slag analog metal pellets in the experimental study of vanadium oxide slag . The experiment investigated the iron slag ratio, the reaction temperature , the initial V2O5 content , the initial TiO2 content of the initial FeO content of vanadium oxides . Experimental results show that : the reaction temperature to 1580 ° C , the slag iron ratio of 1:4 , synthetic slag composition and metal pellets acidic slag composition , the acidic of vanadium titanium slag vanadium oxide reduction reaction faster in 70min reduction rate can reach 80% , the equilibrium was achieved at 120min , the reduction rate was 92.9% . The higher the temperature, the greater the amount of the iron bath and slag , the greater the initial content (V2O5) are more conducive to vanadium reduction reaction to improve the reaction rate . The initial content in the slag (FeO) and the initial content (TiO2) are the higher , the less beneficial vanadium reduction reaction is carried out , reducing the reaction rate . Different vanadium oxide reduction rate of slag XRD and SEM analysis, we found the main phases in the pyrope mixed with a small amount of diopside black titanium and magnesium stone mixed with a small amount of iron oxide , titanium large number of endowed magnesium titanium black stone in . Ti in the early stage of the reaction ( vanadium oxide reduction rate of 28.75% -38.34 %) most of the occurrence long strip Mg3Al4Ti3O25 , tests show that the solid solution phase material , a small part of phase dispersed in the silicate phase and a small piece of particulate matter , with the the reduction reaction is carried out , Ti gradually from the silicate phase precipitates and binding the strip Mg3Al4Ti3O25 aggregates grew growth with small pieces of particulate matter , the tests show that the solid solution phase , and eventually this phase . Beginning of the reaction , V ( vanadium oxide reduction rate of 28.75% -38.34 %) mainly occur in small pieces granular and long strips of titanium - containing material phase titanium closely associated with the conduct of the reduction reaction , V is gradually restore the iron liquid , late in the reaction ( vanadium oxide reduction rate of 71.41% -76.68 %) , the remaining were not restored V Fu presence of silicate phase .