A Iaboratory scale fine particles~las conveyedsystem was utilized to measure the reduction rates of liquid wustite with hydrogen at high temperatures. N2-H2mixtures having various flow rates and compositions were flowed downwardthrough a cylindrical reactor maintained at a constant temperature of 1 723 to 1 823 K. A batch of pure spherical wustite particles (mean dia.; 58,lm) was concurrently fed into the reactor at a small constant rate and reduced in a hot zone. The reduction process was

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... to proceed in such a manner that metallic iron particles were enclosed inside a wustite droplet. Rate analysis was made of one dimensional mass balance equations for particles and gas in a steady moving bed under an isothermal condition using the reaction rate for a singk~particle taking the shrinkage into consideration. Under relatively small reducing potentials. it was concluded that the major fraction of overall reaction resistance is attributable to chemical reaction. However. under higher reducing potentials, the reduction process was estimated to include an appreciable diftusion resistance within the liquid phase. Fromthe temperature dependenceof forward chemical reaction rate constants, the activation energy was evaluated to be 1 10kJ/mol.