Development of new smelting process by using metal dusting

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As a fundamental research for the production of fine reduction iron powder by using metal dusting, the decomposition behavior of iron carbide at high temperature (above 750℃) and low temperature (under 750℃) was investigated by using a reagent hematite powder and iron ore particle. Moreover, the decomposition behavior of iron carbide was investigated by using a fluidized bed reactor. The results obtained are summarized as follows:(1) The decomposition rate of iron carbide which synthesized from reagent hematite with H_2-30vol%CH_4 at 750℃ was fastest at 650℃ and 900℃. Moreover, the amount of excess carbon generated during decomposition of iron carbide at 650℃ was 1/5 times that at 900℃. Therefore, The decomposition of iron carbide at 650℃ is well suited to remove the excess carbon.(2) The same experiment was carried out by using iron ore particle (250~600μm) and the same results when reagent hematite powder was used were obtained. Therefore, metal dusting is able to use iron ore particle.(3) The excess carbon generated during decomposition of iron carbide was removed by gasification with CO-20vol%C0_2 at 900℃. The removal rate of excess carbon generated at 650℃ was faster than that at 900℃ because the amount of excess carbon generated at 650℃ was smaller than that at 900℃.(4) It is difficult to remove the excess carbon generated during decomposition of iron carbide by using a fluidized bed reactor because of sintering the decomposition iron.