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 C_sol/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 H₂/CH₄ mixture, and 1050 to 1250°C reaction temperature, the rate of C_sol/soot formation is decreased, and the rate of reduction is increased.