GAS-SOLID REACTION WILL HELP SOLID-SOLID REACTION — NOVEL IRON ORE AGGLOMERATE BEARING SEMI-COAL-CHAR

摘要

In the course of carbonization of coal under a rising temperature condition, volatile matter (V.M.) is released. The kind and amount of V.M. released depend on the kind of coal. Components of V.M. are tar, hydrocarbons (CH_4, C_2H_4, C_2H_6, C_3H_8), CO, CO_2 and H_2, 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 certain temperature, T_(C, max), semi-coal-char with residual V.M. is obtained. If some optimum interruption-temperature is chosen, small but most suitable amount of V.M., namely H_2, is retained. When the semi-coal-char thus obtained is heated again under the same rising temperature conditions but up to more than T_(C, max) , the residual V.M. is released from just around T_(C, max). We propose novel iron ore agglomerate bearing such semi-coal-char with some strength. While simple iron ore agglomerate bearing coal char will start the reduction reaction as solid-solid reaction at somewhat higher temperature, the proposed one will start the reduction reaction as gas-solid reaction at somewhat lower temperature but a little higher than T_(C, max). Samples of semi-coal-char and novel iron ore agglomerate bearing such semi-coal-char have been prepared and evaluated.