8th International Congress on Science and Technology of Ironmaking - ICSTI 2018

Flash ironmaking is a new smelting reduction process. The extent of molten iron carburization is close to saturation in the blast furnace process. However, the extent of carburization in a flash ironmaking process is unexpected because there is no compression of solid charge and no carburization reactions occurred between the deadman bottom and hot metal. To this end, iron powder reduced and chemical pure graphite were used as raw materials, and the iron powder was heated up to 1855K by using a tubular resistance furnace, and the high-purity N2 was used as the protective gas to study the kinetics of coke dissolution in molten iron. The experimental results show that discarding the change of "k" _"t" with dissolution time, the values of "k" _"t" were determined under experimental conditions in each group, 4.20×10-6 m/s (First group), 5.28×10-6 m/s (Second group) and 6.50×10-6m/s (Third group) under natural convection conditions. Considering the change of dissolution rate coefficient with dissolution time, the dissolution rate "k" _"t" decreases with the increase of dissolution time and is only controlled by mass transfer, and also decreases with the increase of sulfur content in the iron bath.