At Kimitsu No. 3 sintering machine, a test was performed which produces a low-Al.03content (1 .500/0)sinter in contrast to an ordinary sinter (Al.03=I .850/•) .Together with tests performed to check the availability of this sinter at Kimitsu No. 3 and No. 4 blast furnaces, off-line model experiments were conducted with the use of the same sinter.The results obtained are as follows: (1) Keeping the sinter cold strength raised by lowering AI20, content at a fixed level has enabled a sintering with low energy (lower FeOcontent) to be done and the reducibility has been improved from ordinary 60'/• to 680/0 in JIS-Rl.(2) Through the off-line model experiments using this sinter and the tests with the use of the same sinter at the actual furnaces, the raise of a shaft efficiency of 2.0 to 2.5"/• has been attained with the raise of JIS-RI of 50/• at the lumpy zone of blast furnace.(3) At the cohesive zone accompaniedwith the formation of melt exceeding 11 50'C, the amount of FeO-containing melt formed has decreased and the chance of pores being stopped up by the melt has diminished thanks to the improved reduction efficiency and the decreased Al.O, and Si02 contents, which has led to a better permeability at the cohesive zone.Then, the resultant merit has brought the improvement in permeability of the blast furnace, which is verified by the foregoing off-line model experiments and actual furnace tests.
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Yamaguchi et al. (1994) studied this question.