Study on low-silica pellet with added MgO and TiO 2

Abstract

Low-silica pellet is beneficial for blast furnace to reduce the amount of slag and fuel rate. However, the reduction swelling of low-silica pellet is serious. The effects of TiO₂ and MgO on such metallurgical properties as reduction swelling, reducibility and smelting performance of pellets have been studied and production of magnesium–titanium-bearing pellet with low silica is proposed in this paper. The MgO in sinter can be transferred to pellet and TiO₂ is provided by the pellet for blast furnace to protect hearth erosion. The magnesium–titanium-bearing pellet with low silica, in which the content of MgO is 1.7%, SiO₂ is 2.8% and TiO₂ is 1.2%, has been produced by the raw materials from Shougang Jingtang United Iron & Steel Co., Ltd. The pellets were used on 5500 m³ blast furnace with a ratio of more than 28% stably and good technical and economical indexes were obtained. The average particle size of sinter was improved when the MgO content of pellet is increased without adding magnesium additives to sinter.