Measurement and Modeling of Thermal Conductivity for Dense Iron Oxide and Porous Iron Ore Aggliomerates in Stepwise Reduction.

摘要: Thermal conductivities of dense pure hematite, magnetite and wustite measured using the laser flash method as reference value have been summarized in form an empirical equation k=1/(AT+B). Wustite shows almost constant relatively low thermal conductivity due to lattice imperfection. resistivities, 1/k, three iron oxides appear change linearly a function temperature up Tammann temperature.Effective fired, nonfired pellets sinter, reduced into magnetite, metallic by CO-CO2 or H2 gas, also systematically range from room 1273 K. The porosity samples was found 20 62% reduction hematite iron. Measured effective values these ore agglomerates are remarkably smaller than those materials existence pore. Effective strongly depend on temperature. There is no significant difference at same degree.The well-explained modified unit cell model originally proposed Luikov when considering structure composed core part connecting solid phase. This clearly identify distinction originated preparation degree.