Influence of the Reducing Conditions on the Chemical Composition of Pig Iron

Studies on the electric pig iron smelting of iron sand-I

Abstract

The fundamental studies on the reducing smelting of iron are and iron sand were researched by many authors. However in these researches, ores of solid state were reduced with reducing agent of gaseous state, it seemed to be not yet reported in details on the reducing smelting in molten state of these.
The authors reduced are and flux in molten state and studied on influence of the reducing conditions on the chemical composition of pig iron. When iron are and iron sand were redu. ced in various reducing conditions, the results were summarized as follows:
1) With increase of reducing temperature, Si, Mn and Ti content of pig iron were increased, S content decreased and P and V content did not change.
2) With increase of slag basicity (%ΣCaO/%ΣSiO₂), Si and S content of pig iron were decreased, Mn content was increased, Ti content was increased gradually and V content did not change.
3) With increase ofΣTiO₂ content in slag, Si, Mn and S content of pig iron was decreased gradually and Ti content was increased to the constant value on the same conditions but did not increase more than its value.
4) When the reduction of iron sand in comparison with iron are at the same conditions, in general, the one obtains high C and low Si content of pig iron and the other obtains low C and high Si content of pig iron.
5) Constituent range indicates the lowest melting temperature (1260. 1310.) of TiO₂ containing slag exists between ΣTiO₂ content in slag=20-25% and slag basicity %ΣCaO/ΣSiO₂=0. 7. -0.8.