延迪（YANDI）铁矿的烧结性能

SINTERING PROPERTIES OF YANDI ORE

研究在一澳大利亚混合铁矿中豆褐铁矿（延迪矿）加入比例的影响。与混合矿中其他铁矿相比，延迪矿具有更高的孔隙度。脱水以后，它的孔隙度进一步增加，导致由细赤铁矿晶粒组成的极度疏松结构的形成。这一特殊结构对混合矿的烧结性能有显著的影响。烧结杯研究及工业试验都证明：当延迪矿在混合矿中的比例超过１５％时，烧结厂的生产率、烧结矿还原性以及低温还原粉化率都有显著变化。

AbstractStudies were carried out to examine the effect of introducing varying levels of a pisolitic limonlte(Yandi)into an Australian iron ore blend.Compared with the other ores in the bl- end Yandi is more porous;its porosity increases further on dehydation,resulting in the for- mation of an extremely open structure composed of fine hematite grains(pseudo-relict hema- tite).This unique structure was found to have a considerable influence on the sintering beha- viour of the blends,Pilot-scale sintering studies and plant trials showed that sinter plant ptoductivity,sinter reducibility and the low-temperature reduction degradation index(RDI)altered si gnificantly when the level of Yandi in the ore blend excecded l5 wt%,The improve- ment in reducibility is thought to be a direct result of increased porosity in the sinter and the presence of the highly reducibl pseudo-relict hematite.Substanti al improvements in RDI were obtained in spite of lower levels of Feo in the s inter Plant trials have also shown that operational changes could be made to the sinter plant to avoid potentia1 deterioration of productivity.