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Synopsis To evaluate high temperature properties of blast furnace burdens, a series o f reduction under load tests was carried out under the conditions simulating blast furnace processes, using sinter, self-fluxed pellets and acid pellets. To investigate the softening and melting mechanism, structural analysis was conducted on those samples taken after interrupting the test. The results obtained are summarized as follows: (1) Generation of molten slag is involved in the assimilation process of slag during softening and melting of samples, and the basic path for this assimilation is considered to be toward the final composition (average gangue composition before reduction) along the direction expanding the liquid phase area with heating. (2) The difference in softening and melting behavior of these burden materials is directly due to the quantity of molten slag formed in the slag assimilation process. It is indirectly due to the differences in reducibility at about 1 000 °C in addition to the composition and volume of gangue before reduction.

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