Special sintering method with previously preheating raw mix was investigated by sintering pot test. In this method the upper part of mix bed on the grate was preheated with 300°C hot air before ignition.Following results were obtained.(1) Degradation of quasi-particles in the mix bed decreased and bed gas permeability increased.(2) Coke consumption was reduced without the reduction in production and the deterioration in sinter quality. The potential heat of coke saved was more than the sensible heat of hot air for preheating. It is due to the increase of coke combustion efficiency by preheating mix bed.2. Test operation of this method by 460 m2 Dwight Lloyd sintering machine with sinter cooler waste gas (280°C) showed the saving of coke consumption by 4.8 Kg/t-sinter and coke oven gas (ignition gas) consumption by 1.0 Nm3/t-sinter.
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TASHIRO et al. (1980) studied this question.
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