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Synopsis Although conventional agglomerates, such as pellets and sinter, have superior properties for the blast furnace, they also have inferior properties. The purpose of the present investigation was to develop a new iron ore agglomeration process that differs from the conventional ones and thereby to improve the properties of the agglomerates. The main results obtained are as follows : (1) Differing from conventional mini-pellet-bearing sinter, the agglomerates, composed of difusional bonding structures, are constituted from aggregates of irregularly shaped pellets restricted to between 5 and 10 mm in diameter. (2) Fine ores such as pellet feeds can be used in large quantities as raw materials for this process, differing from the conventional sinter processes, because they are granulated completely. (3) According to an estimation of methods for the addition of fine coke to the raw materials by the mathematical model, it became clear that the method for preferential addition of cokes to the surface of green balls was suitable because of e ffective coke combustion. This was verified by pot grate, furnace tests. (4) The properties of the new experimentally produced agglomerates were found to be superior to those of sinter. The desirable properties were considered dependent mainly on micro-and macro-structures and process characteristics.

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