各種実用ペレットの常温および高温性状

概要

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Sampled commercial pellets are classified into 6 types according to the chemical composition of gangue in pellets, that is SiO_2-type, (SiO_2+Al_2O_3)-type, high total Fe-type, CaO-type, (CaO+MgO)-type, and the rest. This paper mainly evaluated high temperature-reducing properties of 44 kinds of commercial pellets in the world, which were measured with one-ball softening test under load. As to beginning temperatures of softening of acid pellets, those of high total Fe-type pellets are higher, those of SiO_2-type pellets with large amounts of gangue minerals are lower, those of (SiO_2+Al_2O_3)-type pellets vary widely depending on indurating conditions and SiO_2/Al_2O_3 ratio in them. Beginning temperatures of softening of self-fluxed pellets are in the highest level. Melting down temperatures of pellets are linearly increased with the increase of total Fe-contents in acid pellets and that of melting points of gangue minerals in self-fluxed pellets. Therefore, in pelletizing of low grade ores, addition of MgO-contained minerals is contributed to improvement of high temperature properties. In acid pellets, the range of SiO_2/(SiO_2+Al_2O_3) ratio=0.75-0.85 in raw ores should avoid in order to attain better high temperature properties of pellets.
社団法人日本鉄鋼協会の論文
1979-03-01