Abstract: Material balance and heat balance equations in COREX smelting reduction process were established by taking the principle of Rist operating line in blast furnace for reference. As the mainly raw materials， lump coal with high volatile would generate large amounts of H2 during the splitting decomposition in the process. Therefore， the influences of H2 on the Rist operating lines of the upper shaft furnace and the lower melter gasifier must be considered. Through the thermodynamic calculation， the mathematic model of Rist operating lines for the whole COREX process was established by an combination of the upper and the lower operating line. Several methods for decreasing the consumption of COREX fuels were proposed， such as improving melting rate， changing the charging fuel structure and so on. The calculation results showed that when the inferiority coke was used for COREX instead of lump coal， the fuel and oxygen saving reached 1747kg and 188% in theory， respectively.

Key words: Rist operating line, COREX process, material balance, heat balance, energy consumption