Industrial practice creates benefits

The basic research found that the advantages of light burnt magnesium powder and magnesium reduction were obvious. In November 2012, the Shougang Jingtang pellet produced magnesium pellets, which provided conditions for sintering magnesium. In February 2013, researchers began the downgrading of MgO industrial test in Shougang Jingtang Sinter, and achieved the following results: the sinter MgO content gradually decreased from 1.8% to 1.5%, combined with the adjustment of the mineral powder structure, the sinter grade was from 55.95%. Increased to 56.48%, after September 2013, the magnesium containing flux has been basically stopped in Shougang Jingtang. After magnesium reduction, the sintering index improved obviously: the ratio of sintered ore <10mm decreased from 20.28% to 17.85%, the reduction decreased from 80.15% to 84.7%, the performance of sintered ore droplets improved significantly, and the S characteristic value of sintered ore decreased from 262 kPa·°C. To 87kPa·°C. In recent years, the main indicators of Shougang Jingtang sinter are shown in the attached table.

After more than one year of industrial practice, the MgO content of Shougang Jingtang sinter in 2014 has stabilized at 1.4%~1.5%, which is at the lowest level in domestic large-scale sinter plants. In October 2014, it further reached 1.35%.

The figure shows the comparison of MgO content between Shougang Jingtang Sintering Plant and International Sintering Plant. Compared with some international advanced factories and mines, although the MgO content of Shougang Jingtang sinter is still slightly higher, it is a natural magnesium sinter that is not equipped with magnesium flux.

According to statistics, the annual benefit of Shougang Jingtang sintering magnesium reduction reached 8.125 million yuan. In October 2014, after expert appraisal, Shougang Jingtang sintering magnesium reduction research and practice reached the domestic leading level.

Experts believe that the successful practice of Shougang Jingtang sintering magnesium reduction has a great application prospect in China. Iron and steel enterprises can mainly consider the following two application schemes: one is to reduce the MgO content in the blast furnace slag by reducing the MgO content of the sinter, and contribute to the blast furnace concentrate; the second is to reduce the proportion of the sintered magnesium-containing flux, correspondingly in the ball Adding suitable magnesium-containing additives to the pellets - transferring the MgO content of the sintered ore to the pellets, improving the metallurgical and droplet properties of the integrated charge by producing low-magnesium sintered ore and high-magnesium pellets, thereby improving the technical and economic indicators of the blast furnace .