鉄鉱石粉の熱分解反応速度

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In order to clarify the thermal decomposition behavior of fine iron ore which is injected into the raceway of a blast furnace, thermal analyses of fine iron ore have been made under various atmospheric conditions (N_2, CO_2, air, O_2 and N_2+O_2 with different oxygen concentrations from 1% to 25%), particle size (average dia. : 55, 155 and 325μm) and heating rate (0.033, 0.167 and 0.33K/s). Akinetic analysis of the reaction (3Fe_2O_3=2Fe_3O_4+1/2O_2) has been made based on measured thermalgravimetric curves by the Coats' method. Its results show that the reaction rate could be described by a second order reaction rate equation with relation to unreacted degree. dα/dt=k(1-α)^2 k=exp(A-E/RT) Furthermore it was found that the starting temperature (T_<D1>) and the kinetic behavior of the reaction were independent of the particle size in the range from 55 to 325μm. However, they were strongly affected by the oxygen potential of the gas atmosphere. Empirical equations to estimate T_<D1>, E and A were obtained as a function of P_<O_2> in the gas atmosphere as follows : T_<D1>=75560/{44.56-ln[P_<O_2>/(1.013*10^5)]} E=20730/{6.543-ln[P_<O_2>/(1.013*10^5)]} A={14.43+ln[P_<O_2>/(1.013*10^5)]}*10^2/6.9306 Using these equations, the thermal decomposition processes of iron ore were analyzed under various conditions and the results coincided well with our experimental results. Under heating conditions simulating raceway in a blast furnace, it was predicted that the injected fine iron ore could be almost decomposed from Fe_2O_3 to Fe_3O_4 in the raceway.
社団法人日本鉄鋼協会の論文
1992-04-01

鉄鉱石粉の熱分解反応速度

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