转炉渣中磷的微观结构行为.

张 蕊; 贾吉祥; 刘承军; 闵 义

To design a reasonal composition of converter slag and achieve a satisfactory dephosphorization ratio， the structures of CaO-SiO2-FexO-P2O5 molten slags were examined by Raman spectroscopy， and the existence form and transformation behavior of phosphorus were further analyzed in terms of the variation of slag composition during the process of basic oxygen steelmaking. The results show that phosphorus in molten slags mainly exists in the forms of Q0(P)， Q¹(P) and Q²(P). Meanwhile， phosphorus can enter the silica tetrahedron and ferrite tetrahedron， and occupy the locations of silicon and iron to form the Si—O—P and Fe—O—P bonds， respectively. With the increasing total content of CaO and FeO， the molar fractions of the Q0(P)， Q¹(P)， Q0(Si) and Q¹(Si) with lower-degree polymerization increase， while the molar fractions of Q²(P)， Q²(Si) and Q³(Si) with higher-degree one decrease. In addition， Si—O—P and Fe—O—P bonds also gradually decrease. The Si—O—P and Fe—O—P bonds disappear， when the basicity of molten slag was 2.83.

MOLE fraction; RAMAN spectroscopy; SLAG; TETRAHEDRA; BASICITY; SILICON isotopes

Journal of Northeastern University (Natural Science), 2021, Vol 42, Issue 5, p646

1005-3026

Academic Journal

10.12068/j.issn.1005-3026.2021.05.006