Abstract
Consideration has been done to obtain the relation between open hearth slag charged in blast furnace and the concentration of phosphorus in pig iron produced. When pig iron, fresh from blast furnace, is at once consumed without rest in steel work, and open hearth slag then made is again at once sent back without rest to blast furnace, the of phosphorus in pig iron produced arises gradually. Is there any limit in its arising? The outhor found the conclusion, primary, that, theoretically said, it arises boundlessly, but practically exist certain limit, and secondary that, utilizing open hearth slag in blast furnace, favorable point can be found in its utilization rate, at which open hearth slag is comparatively much used, without making the, of phosphorus in pig iron so high.
