Abstract: A two-step three-segment iron bath smelting reduction process with thick slag layer was proposed. The thick slag layer in the smelting reduction vessel was adopted to ensure the separation between the oxidation exothermic of oxidation zone and the reduction of reduction zone. The use of gas reforming furnace improved the gas utilization rate， and the use of rotary hearth furnace pre-reduction matched energy consumption of whole system to be lowest. Based on the material balance and energy balance principle， a static model of the process was established. According to all set aspects of process in production， the mass consumption and energy consumption were obtained and compared with other ironmaking processes to clarify the characteristics and advantages of the present process， which could provide a reference to the production practice.

Key words: thick slag layer, two-step three-segment, iron bath smelting reduction, pellet, static model