Coupled reaction kinetics of duplex steelmaking process for high phosphorus hot metal

Abstract

The duplex steelmaking process has been proven to be an effective solution for the utilisation of high phosphorus iron ore, yet systematic analyses of the dephosphorisation rate and mechanism of duplex process for high phosphorus hot metal are seldom reported. Comprehensive exploration and discussion on the kinetics of duplex steelmaking process for high phosphorus hot metal are thus required. First, based on the kinetic model proposed by Robertson et al., a modified coupled reaction kinetic model was formulated and employed to analyse the dephosphorisation process of duplex melting for high phosphorus hot metal. Furthermore, a series of experiments were carried out to validate the accuracy of the established model, and the calculated results showed good agreement with the experimental data. Finally, a parametric study was conducted to perform a further discussion of the mechanism of duplex steelmaking process for high phosphorus hot metal.

Get full access to this article

View all access options for this article.

References

Diao

: ‘Applied fundamental research on medium and high phosphorus hot metal refining by duplex process in converter’, PhD thesis, Chongqing University, Chongqing, China, 2010.

Robertson

DGC

Deo

Ohguchi

: ‘Multicomponent mixed-transport-control theory for kinetics of coupled slag/metal and slag/metal/gas reactions: application to desulphurisation of molten iron’, Ironmaking Steelmaking, 1984, 11, (1), 41–55.

Ohguchi

Robertson

DGC

Deo

: ‘Simultaneous dephosphorisation and desulphurization of molten pig iron’, Ironmaking Steelmaking, 1984, 11, (4), 202–213.

Zhong

: ‘Coupled reaction kinetics of hot metal pretreatment process’, Steelmaking, 1987, (4), 63–68.

Dong

Jiang

Cai

: ‘Kinetics on simultaneous dephosphorisation and desulphurisation from hot metal’, J. N. China Metall. Coll., 1993, 10, (2), 7–12.

: ‘Kinetics of steelmaking’; 2001, Beijing, Metallurgical Industry Press.

Zhao

: ‘A coupling dynamic model for oxidizing dephosphorisation of stainless steel’, Res. Iron Steel, 2002, (5), 13–15.

Tian

: ‘Technology and theory of molten steel deep dephosphorisation out of converter for production of ultra-low phosphorus steel’, PhD thesis, University of Science and Technology Beijing, Beijing, China, 2005.

Kitamura

Shibata

Maruoka

: ‘Kinetic model of hot metal dephosphorisation by liquid and solid coexisting slags’, Steel Res. Int., 2008, 79, (8), 586–590.

10.

Turkdogan

: ‘Physical chemistry of high temperature technology’; 1980, New York, Academic Press.

11.

Chen

: ‘Handbook of commonly used diagrams and data in steelmaking process’; 1984, Beijing, Metallurgical Industry Press.

12.

Wagner

: ‘Thermodynamics of alloys’; 1962, Cambridge, MA, Addison-Wesley.

13.

Huang

: ‘Principles of iron and steel metallurgy’; 2002, Beijing, Metallurgical Industry Press.

14.

Lumsden

: ‘Physical chemistry of process metallurgy, part I’; 1961, New York, Interscience.

15.

Nagabayashi

Hino

Ban-ya

: ‘Mathematical expression of phosphorus distribution in steelmaking process by quadratic formalism’, ISIJ Int., 1989, 29, (2), 140–147.

16.

Ban-ya

: ‘Mathematical expression of slag–metal reactions in steelmaking process by quadratic formalism based on the regular solution model’, ISIJ Int., 1993, 33, (1), 2–11.