Effect of Residual Volatile Matter on Reduction of Iron Oxide in Carbon Composite Pellets





Volatile matter (V.M.) is released in the course of carbonization of coal under a rising temperature condition. The kind and amount of V.M. depend on the kind of coal. Components of V.M. are tar, hydrocarbons (CH<SUB>4</SUB>, C<SUB>2</SUB>H<SUB>4</SUB>, C<SUB>2</SUB>H<SUB>6</SUB>, C<SUB>3</SUB>H<SUB>8</SUB>), CO, CO<SUB>2</SUB> and H<SUB>2</SUB>, which are released in this order as a function of carbonization temperature. When the carbonization of coal under a rising temperature condition is interrupted at a maximum carbonization temperature, T<SUB>C, max</SUB>, semi-coal-char with residual V.M. is obtained. If some optimum interruption-temperature is chosen, small but most suitable amount of V.M. is retained. When the semi-coal-char thus obtained is heated again under the same rising temperature conditions but up to more than T<SUB>C, max</SUB>, the residual V.M. is released from just around T<SUB>C, max</SUB>. We propose novel iron ore agglomerate bearing such semi-coal-char with some strength in order to decrease the initial temperature for reduction of iron oxide under a rising temperature condition, such as in a blast furnace shaft. The carbonization of Newcastle blend coal under a rising temperature condition was interrupted at T<SUB>C, max</SUB> = 823, 873, 1073, 1173 and 1273 K, to obtain semi-coal-char with some residual V.M. Thus obtained semi-coal-char at T<SUB>C, max</SUB> = 823 K retained much amount of V.M, most of which was H<SUB>2</SUB>. The semi-coal-char was mixed with reagent grade hematite in the mass ratio of one to four, and added with a Bentonite of 1 mass% as a binder. The carbon composite pellets bearing the semi-coal-char were prepared and reduced from room temperature to maximum reduction temperatures, T<SUB>R, max</SUB> = 873, 973, 1073, 1173 and 1273 K, at 3 K min<SUP>-1</SUP> in the nitrogen gas atmosphere. It was confirmed by the gas chromatography of gas generated by reduction of pellets that the carbon composite pellets bearing the semi-coal-char at T<SUB>C, max</SUB> = 823 K had the highest reducibility of the iron oxide; the original Fe<SUB>2</SUB>O<SUB>3</SUB> was mainly changed to Fe<SUB>3</SUB>O<SUB>4</SUB> at T<SUB>R, max</SUB> = 973 K and 1073 K, to FeO at 1173 K and to Fe at 1273 K.


  • 実験力学 : journal of JSEM

    実験力学 : journal of JSEM 8, 142-146, 2008-06-25

    The Japanese Society for Experimental Mechanics

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