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The reducibility, fine generation dur'ing reduction and clustering oJ pellets and ores were discussed all the basis oJ the results oJ Ihe experiments made by reproducing the reducing conditionsIor a direct reduction shaf/Jurnace. Pellets produced at an actual pelletizing plant and 11lmp ores as well as pellets fired at the test plant were reduced at a temperature ranging Jrom 760°C to 960°C, with the reducing gas composed oJ H 2 : 55 %, CO: 36%, CO 2 : 5 % and CH,: 4%. The reducibility and clustering characteristics oJ pellet are related Jairly well to the amount oJ gangue or that oJ lime added, and the high iron grade pellet is superior to the low grade one in respect oJ the reducibility; however, on the contrary it tends to Jorm elusters. The decrease in reducibility with an illcrease in slag volume or lime addition is de/Jelldent OIl the Jormalion of liquid IJ/wse during the pellet firing process, where a certain amount oJ iron oxide is ineluded. The Jormation q[ cluster during the reduction process depends mainly on such three Jactors as temperature, load on the burden bed and IJ rolJerties oJ raw mataial. The shrinkage ratio of pellet bed qf the reduction underload test reiated to the strength oJ clusler, and the higher the shrinkage ratio is the stronger the cluster becol/IPs. Addition oJ a small amount oJ lime to the high iron grade pellet is effective to obstruct the Jormation oJ cluster.

Reduction Properties of Raw Materials for Direct Reduction Shaft Furnace