The effect of lime coating of hematite pellets on soot formation and reduction rate with CH4/H2

Abstract

In some of the Direct Reduction (DR) methods, the iron oxides would be reduced with reformed natural gas. Due to the reduction conditions, temperature, gas flow, pressure, and the component of the reducer gas, the decomposition of CH4, and CO to Csol/soot formation on the surface of the pellets is possible. Consequently, the rate of reduction, and the consumption of the reducer gas could be changed. In this research, the effect of coated hematite pellets with lime on the reduction rate of iron oxides, and also C sol/soot formation, is reported. By increasing of 3-8% lime on the surface of the pellets with a diameter of 10 mm, 15-40% H2 in H 2/CH4 mixture, and 1 050 to 1 250d̀C reaction temperature, the rate of Csol/soot formation is decreased, and the rate of reduction is increased.