Experimental Study Of Sintering On Indonesia Vanadium-Titanium Magnetite

In recent years, the price of iron ore increases rapidly. The competition among steel companies becomes drastic. So, it is important for each steel company to cut down production costs and improve competitive advantages. The diversifications, stabilization, low-cost of iron ore supply are the effective measures which can maintain the stability of production, reduce production costs and improve competitiveness for the steel companies. As main raw material of blast furnace, the quality of sinter is directly related to the iron-making processes, therefore, it is necessary to assess its possible impact on the blast furnace process before any new iron ore will be used.According to the raw material conditions and smelting conditions of a typical iron and steel plant, the Indonesia Vanadium-Titanium magnetite is applied to the sintering production for iron making in the typical iron and steel plant. The proportions of it are 0%,7.5%,15%,22.5%,30%, and 45% in sintering process. The researches mainly include the variation of sintering index, metallurgical properties, and the fluidity of Titanium-content slag. The results are as follows:When the basicity of sinter is 1.9, with the increase of the proportion of Indonesia Vanadium-Titanium magnetite:(1) The proportion of finished sinters decreases gradually, when the proportion of Indonesia Vanadium-Titanium magnetite is 0%, the proportion of finished sinters is 83.5%, it decreases to 80.1%, when the proportion of finished sinters is 45%. The vertical sintering speed gets down, too. With the proportion of Indonesia Vanadium-Titanium magnetite increase from 0% to 45%, the vertical sintering speed decrease from 20.8mm/min to 17.9mm/min. Similarly, the sintering utilization coefficient decreases from 1.65t/(m2·h) to 1.47t/(m2·h).(2) With the proportion of Indonesia Vanadium-Titanium magnetite increase from 0% to 15%, the drum index improves slightly. With the proportion increase from 15% to 45%. the drum index decreases from 66.22% to 48.44%. Summing up the above, the variation of drum index is related to the addition of Indonesia Vanadium-Titanium magnetite.(3) The RDI-3.15 of sinter is increasing gradually. When the proportion of Indonesia Vanadium-Titanium magnetite is 0%, it is 31.56%; when the proportion is 45%, the RDI-3.15 is 41.74%; it increases by 10.18%. The variation of RDI-3.15 is involved with perovskite (CaO·TiO2), because the cementing action of perovskite is weaker.(4) With the proportion of Indonesia Vanadium-Titanium magnetite increase from 0% to 15%, the RI improves slightly. When the proportion increases continually, the RI decreases rapidly. With the addition of Vanadium-Titanium magnetite increase from 0% to 45%, the RI of sinter decreases by 6.56% in all.(5) With the increasing of the Vanadium-Titanium magnetite in sinter, the starting softening temperature increases gradually and the final softening temperature increases as well, thereby the softening range becomes narrow. Both starting and final melting temperatures begin to ascent, and the variation of melting range is not obvious. The temperature of softening and melting range becomes narrow slightly. The△Pmax is increasing gradually.(6) According to the slag conditions of a typical iron and steel plant, the variation of melting temperature for slag is not obvious after the addition of TiO2 slightly, but when the content of TiO2 is more than 10%, the melting temperature gets up gradually, at the same time, the fluidity of slag is worse.