Abstract
No. 2 blast furnace in Kokura Steel Works which started in January 1951, is now producing the low copper, low sulphur pig iron to be used for steel plants.
Recently, in order to increase the output, to decrease coke ratio and to improve the pig quality, improvements in the blast furnace practice was thoroughly performed as follows:
1) Preparation and controlled use of raw materials was more improved.
2) Sinter production was increased more and sinter qualities were more improved.
3) In the furnace operation, the slack-wind-blowing was practiced and the blast pressure was controlled and charging method was found out the best.
4) Tuyeres were changed from the circular type to the elliptic type.
As results of this improved operation, espectally the output increased to over 400t/day, and the coke ratio decreased below 0•700, during the period from December 1953 to April 1954.
This improvement presumably depends mainly on the better sizing of raw materials as well as on the furnace operation matched for it.
