process for inhibiting the excessive foaming during the refining of molten iron before fusion, and to reduce the content of phosphorus and methods and devices for implementing said method

摘要

The present invention provides a process for preventing foaming over in the case of converting pig iron into steel, as well as for lowering the phosphorus content, by blowing in oxygen in the presence of basic, slag-foaming materials, with the simultaneous blowing of finely particulate calcium carbide into and/or on to the melt, wherein finely particulate calcium carbide is introduced in an amount corresponding to the oxygen excess of the slag at the point of time at which the rate of decarbonizing increases, the slag foams up and/or the slag indicates an increased oxygen potential. The present invention also provides a composition and apparatus for carrying out this process.