ペレット製造における焼成雰囲気の影響について(製銑関係)

概要

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The influence of firing atmosphere on phisical properties of fired iron ore pellets was investigated in a bench scale. Pellets were made from one of six kinds of natural iron ores or three kinds of artificial iron ores. Pure nitrogen, pure oxygen, mixture of nitrogen and oxygen in various rate, and others, were used as the firing atmosphere. The results obtained are as follows ; (1) The crushing strength of limonite pellet became weak as the oxygen content in firing atmosphere was higher. The crushing strength of magnetite pellet was low when fired in the atmosphere containing 6∿10% oxygen, and that of hematite pellet was almost independent of firing atmosphere. (2) Physical properties of pellets fired in atmosphere of steam, carbon dioxide or nitrogen were mostly the same. (3) Higher oxygen content in the firing atmosphere tends to give higher porosity for all the pellets tested. (4) When CaCO_3 was added to the ore, the bonding mechanism was seemed to be complicated. (5) The results show that the crushing strength and chemical composition of pellets are influenced by the firing atmosphere. This indicates that an adequate knowledge of the effect of firing atmosphere for each iron ore is necessary in order to improve the pellet quality.
社団法人日本鉄鋼協会の論文
1970-02-01