Effect of Particle Size of Fine Hematite on Characteristics and Strength of Quasi-particle

In order to simplify the factor which affected on granulation properties of the iron ore, granulation experiment was conducted by using nuclei and fine iron ore having smooth surface. The effect of particle size of fine hematite iron ore on granulation properties and strength was investigated. The results obtained are follows: (1) From the results of granulation experiment using single test sample Ore HF, HF’ and HF’’ having different particle sizes, the wet and dry strength of quasi-particle obtained by using single test sample did not depend on the quasi-particle size. (2) When using mixing sample consisting of Ore HN used as nucleus ore and Ore HF, HF’ and HF’’ used as adherent fine ore, the wet and dry strength of quasi-particle bigger than 5 mm was almost the same level in the case of single test sample. On the other hand, the wet and dry strength of quasi-particle less than 5 mm was larger than that of single test sample. (3) When the quasi-particle size using mixing sample was bigger than 5 mm, the compressive strength of quasi-particle depended on the compressive strength of adherent layer because the nucleus ore did not contact with each other. On the other hand, when the quasi-particle size was smaller than 5 mm, the compressive strength of quasi-particle was independent on the compressive strength of adherent layer because the nucleus ore contacted with each other.