Study On Direct Reductionand Melting Technology Of Vanadium Titanium Magnetite Concentrate

Based on vanadium titanium magnetite concentrate as raw material, directreduction-melting experiment has been carried out in laboratory for process parametersresearch, realize the comprehensive utilization of resources. Through a series ofexperimental studies, explores the reducing agent, reduction temperature, reductiontime and other factors in the direct reduction process on the influence of vanadiumtitanium magnetite concentrate metallization rate, in the process of the melting,basicity,melting temperature, holding time and other factors on the effect of metallized pelletmelting processs and slag, and the effects of enrichment of TiO2.Vanadium titanium magnetite concentrate pelletizing experiment results show thatas the pelletizing raw material in the increase of coal powder mass ratio of the raw balldrop strength and compressive strength are gradually decreased; The high ratio ofbinder can make pellets drop strength and compressive strength meet the requirementsof normal production.Vanadium titanium magnetite concentrate with carbon pellet direct reduction in theexperimental results show that the carbon and reduction time on the certain case, pelletsof metallization rate along with the increase of reduction temperature, when thereduction temperature to1300℃, pellets have certain degree of softening and binding;In the case of reduction temperature, reduction time must, as with the increased amountof carbon in the pellets, pellet direct reduction after metallization rate showed a trend ofincrease, after reaching to a certain extent. The factors affecting pellets metallizationrate of primary and secondary order: carbon content>reduction temperature> time. Thereducing reaction conditions for the optimal temperature of1250℃, reduction time60min, with16.56%carbon. Metallized pellet under the condition of the iron content is61.92%, metallization rate is86.5%, the content of TiO2is16.26%. Vanadium titanium magnetite concentrate of metallized pellet melting processs andthe experimental results show that when alkalinity is lower, with the increase ofalkalinity values, FeO content in slag; When alkalinity is greater than1.4, instead ofFeO content in slag as the alkalinity value increases; With the increase of meltingprocesss and temperature, higher FeO content in slag, small, and changes in between9%~11%; TiO2content at first and lowered later reached the highest at1500℃. With theextension of heat preservation time,FeO content in slag drops; The time of heatpreservation and the effect of TiO2slag enrichment effect is relatively small. Slagmelting processs and FeO content of TiO2content showed significant correlation. WhenFeO content in slag is low, TiO2content is relatively high, while FeO content in slag ishigher than10%, the enrichment of TiO2in the slag effect is obvious. Level of variablefactors on the impact of change on FeO content in slag be pecking order: melttemperature>alkalinity>holding time, the effect of TiO2content in slag be pecking order:melting processs temperature>holding time> alkalinity of heat preservation. Optimummelting processs of the process parameters for:basicity1.4,melting process temperature1500℃, holding time120min. Under the condition of themelting processs of FeOcontent in slag is6.50%, the content of TiO2is46.86%.