Reduction and Melting Behavior of Pre-reduction Metallized Carbon-Bearing Pellets in Iron Bath Smelting Reduction Furnace

Because of the problems associated with pulverized charge in rotary kilns of the rotary kiln pre-reduction and bath smelting process, we proposed that the pulverized charge was granulated moderately to produce carbon-bearing pellets, and the particle size range was limited. In this work, we mainly investigated the effect of smelting temperature and smelting time on the reduction and melting separation of the pellets. The results indicated that the pellets could achieve a high metallization ratio and favorable separation when the proportion of the pellets with particle size of 2–5 mm was more than 60%, the smelting temperature was 1500–1550°C, and the smelting time was 160–200 s. This moderate granulation of the pulverized charge is effective in reducing energy consumption and increasing production efficiency of the process when the range of particle sizes of the pellets is controlled.