EFFECT OF PARTICLE MORPHOLOGY OF IRON ORE ON MOISTURE SEGREGATION IN SINTER MIXTURE

摘要

Suitable content and distribution of sinter mix moisture plays an important role in promoting particle growth and improving granulated particle strength. Previous researches mainly concerned the effects of water absorption and saturated water amount of iron ore on moisture addition. However, rare researches covered the effect of particle morphology of iron ore on moisture segregation in sinter mixture. By application of immersion method and capillary water suction method, experiments are conducted to study the effects of porosity, size distribution and particle shape on water absorption rate. Moreover, water absorption characteristics of iron ore at different stages are investigated, thus relationship between particle morphology and moisture segregation is obtained, and moisture segregation mechanism is explored. The results are as follows: (1) Iron ore which has larger porosity, smaller particle size and plate structure has larger water absorption rate, thus this typical iron ore can obtain more segregated water. (2) The process-water absorption rate of iron ore is mainly influenced by particle shape in the earlier stage while affected mainly by porosity in the later stage. (3) The size and amount of capillary pores among iron ore particles are mainly determined by particle morphology of iron ore which produces the different capillary effects and all these results in the moisture segregation.