熔鑛爐湯溜り吹精に関する試驗報告

概要

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In order to reduce the cost price of iron and steel, it is necessary to ntilize fully natural resources in Japan and South-East Asia. First of all it must be prepared for the future to use the natural resources of iron, which contain sulphur in ever-increasing proportion. A special bessemerizing process was devised to blow air or oxygen directly into the hearth of the blast furnace. As regards this method a joint research of Tokyo University and Yawata Iron & Steel Co. Ltd., was executed in 1951∿52, using a 3ton test blast furnace of the Technical Institute of this Company. Through these experiments the slant tuyer for bessemerizing was invented, and the heat-proof blowing pipe of high durability was born, tbus a safe and practical method was found which we were able to use in this process, During these two years the following results were confirmed : (1) Through a simple operation, i. e. by only one bessemerizing (5-10 minutes) between tap to tap, a pig-iron of high temperature, containing low Si, S and high Mn, could be obtained even if the burden contained high sulphur. (2) In combination with the deeper hearth the tap interval could be prolonged considerably (from 2∿3 hours to 6∿8 hours). (3) A good condition of the furnace that is "cold top and hot bottom" could be maintained. The top-gas temperature was lowered and the hearth was kept hot. (4) Liquid pig and slag in the hearth could be extracted as samples for analysis at will, which made it possible to find the metal components before tapping. (5) By special designed jet-feeder it became possible to blow lime, ferro-silicon and other additional refining materials directly into the bath through the slant tuyer. (6) The components of the slag and metal in the bath could be controlled at will by using (4) and (5). (7) Through this special bessemerizing and the invention of a method to lower the metal bath temperature by blowing water and inert gases directly into the hearth, it became possible for the smelter to keep the bath temperature at the most desirable condition to detect impurities in refining, and to discharge at the constant tap temperature. In short, the special process of bessemerizing the bath in the blast furnace has made it possible to change the hearth which has been a dead space into an active one, and to make the most of bad natural resources containing high sulphur and other impurities. Still more, as a future prospect, it has made a step forward to the ideal blast furnace of "constant component, constant tapping temperature, and one to three taps a day".
社団法人日本鉄鋼協会の論文
1954-07-25

著者

金森九郎
東京大學生産技術研究所

熔鑛爐湯溜り吹精に関する試驗報告

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