Abstract: The exothermic reaction of biomass fuel is too fast， causing a heat mismatch between flame front and wave front， which can greatly affect the performance of the ore sintering. In this work， the CaO powder will be filled in the pore of biomass fuel and the “package granulation” will be used to make a modification of biomass fuel in order to optimize the reaction. The differential thermal and thermo gravimetric results of modified fuel are compared with those of coke breeze. The experimental results show that the exothermic reaction temperature of the biomass fuel modified by CaO powder increases to 382.09℃ and the exothermic inflection point temperature increases to 395.23℃， and the differential thermal curve moves back and delays thermal release. As to the biomass fuel modified by the “package granulation” in the sintering mixture， the weightlessness temperature increases to 462℃， the weight loss time is prolonged， and the weight loss curve closes to that of coke powder.

Key words: biomass fuel, iron ore sintering, biomass modification, package granulation, sintering fuel gas