The object for the foundation of Amagasaki Iron & Steel Mfg., Co. consists in the characteristics of high percentage use of home ores.
These iron materials, pyrite cinder and Kanehira ore, were sintered after treatment of extracting copper.
Such sintered ore is used for materials of superior quality with least impurities, such as phosphurus, sulphur and alumina.
The effect of sinter, improved by a demand for No. 1 blast furnace operation, indicated good reducibility by incorporation of sinter in the blast furnace burden.
In addition to sinter in burden, results of operation were profitable to reduce coke ratio and to increass pig iron production.
With regard to allowable limit of copper contents in iron, sinter addition rates were limited as follows:
1) For lower copper pig iron, utilizing less than 45% of sinter in burden
2) For basic pig, 50-70% of sinter
3) For foundry pig iron, 80-100% of sinter
Therefore, all-sinter burden was performed only for foundry pig iron blowing.
With the application of W. Oelsen curve on the studies of operating results for various addition rate of sinter in burden, the author proved that the higher sinter addition rate, the better reacting behaviors in furnace were achieved.
As sinter addition rate is increased in burden, the effect of desulphurization showed better efficiency.
In case of an all-sinter blowing for foundry pig iron, the author could not find any difficulties in desired control of the furnace.
So that sinter, made from pyrite cinder, from the point of the merit of iron ore, was able to utilize the economically excellent iron source.