（1. Ironmaking Department， Shougang Jingtang United Iron and Steel Co.， Ltd.， Tangshan 063200， Hebei， China 2. Institute of Iron and Steel， Shougang Research Institute of Technology， Beijing 100043， China 3. School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing， Beijing 100083， China）
Abstract：In order to further improve the level of the concentrate charging in the large- sized 5 500 m3 blast furnace, based on the natural magnesium sintering without dolomite, combined with the relevant sintering cup test, the microstructure was studied in Shougang Jingtang Ironmaking Department. According to the production practice, the measures, such as optimizing the ore mix constitution and adjusting the process control parameters, were applied to produce the low- silicon and magnesium sinter with gradually reducing the mass fraction of SiO2 and MgO in the sinter. Through the application of the low- silicon low- magnesium sintering technology, the level of concentrate charging was guaranteed on the basis of the steady strength and granularity of the sinter in the Shougang Jingtang Ironmaking Department, and it had a good effect, which created a good raw material condition for improving the overall furnace grade, reducing the slag ratio and the injected coal in Jingtang 5 500 m3 special large blast furnace.
2017, Vol. 27 
