|
|
|
| KINETICS OF DESULPHURIZATION BY POWDER INJECTION AND BLOWING IN RH REFINING OF MOLTEN STEEL |
| WEI Chiho;ZHU Shoujun; YU Nengwen (Shanghai Enhanced Laboratory of Ferrous Metallurgy; Shanghai University; Shanghai 200072) |
|
Cite this article:
WEI Chiho;ZHU Shoujun; YU Nengwen (Shanghai Enhanced Laboratory of Ferrous Metallurgy; Shanghai University; Shanghai 200072). KINETICS OF DESULPHURIZATION BY POWDER INJECTION AND BLOWING IN RH REFINING OF MOLTEN STEEL. Acta Metall Sin, 1998, 34(5): 497-505.
|
|
|
Abstract The desulphurization process by powder injection and blowing in RH refining of molten steel and its mechanism have been considered and analyzed. Based on the two-resistance mass transfer theory and the mass balance of sulphur in the system, a kinetic model for the process has been developed. The ralated parameters of the model have been determined. Calculating and modelling for the process by injecting and blowing the lime based powder flux under the assumed operating modes in a RH degasser of 300 t capacity have been carried out using the model. The corresponding circulation rate and the powder injection and blowing rate were taken as 100 t/min and 150 kg/min, respectively. The initial contents of sulphur and the amounts of powder injection and blowing were respectively assumed to be 70, 60, 50, 40, 30, 20×10-4% (massfraction) and 10, 8, 6, 5, 4, 3 kg/t-steel. The total treatment time for desulphurization under each mode was set up to be 24 min that is equivalent to eight circulation cycles of liquid steel to be treated. The results indicated that the prediction made by this model is in good agreement with some data of the industrial experiments and production practice, injecting and blowing the lime-based powder flux(85%CaO+15%CaF2)of 3-5 kg/t-steel with the total treatment time of 12-20 min, it is entirely possible to make the sulphur content in molten steel decrease to the ultra-low level below (5- 10)× 10-4% from (60-80)×10-4%; intensifying the powder injection and blowing operation and increasing the circulation rate of liquid steel may effectively raise the rate of the process in RH refining.
|
|
Received: 18 May 1998
|
1远藤公一.制铁研究,19892 335:20(Endoh K. Sada Tetsu Togisata,1989; 335:20)
2 Endoh K.Nippon Steel Technic Rep,1990;45(4)
3Hatakeyama T,Mizukami Y,Igo K,Oita M.Ircn&Steelmaker,1989;15(7):23
4 Myrayama N,Mizukami Y,Azuma K,Onoyma S,Imais T.Proc 6th International Iron and Steel Congress,Vol.3, Napoya: The Iron and Steel Institute of Japan, 1990 151
5 Hale R J,Merk R,Otterman B A Steelmaking Conf Proc,ISS-AIME,Detroit,MI,1990:69
6上原搏英,水藤正人,高桥清志,有吉政弘,桐原理,加藤嘉英。CAMP-ISIJ,1922 5:1240(Ueharal H.Suito M,Takahashi K,Ariyoshi S,Kirihara T,Kato Y.CAMP-ISIJ,1992; 5:1240)
7冈田泰和,深川信,家田幸治,海老原明彦,池宫洋行,真目薰CAMP—ISIJ, 1992;5:1238(Okada Y, Fukawa M, Yata K, Ebihara A, Ikemiya N, Makoto M CAMP—ISIJt 1992 5: 1238)
8冈田泰和,真屋敬一。铁钢,1994;80(1):T9(Okada Y. Shinya H. Tetsu Hagane, 1994; 80(1): T9)
9川合保治,森克已,三宫好史。铁钢,1975;61(1):29(Kawai Y,Mori K,Sanomiya Y.Tetsu Hagane.1975;61(1):29)
10 Oeters F, Strohmenger P, Pluschkell W Arch Eisenhuttenwes, 1973 44: 727
11溶铁·溶滓物性植便览,溶钢·溶滓部会报告,东京:日本铁钢协会,1971:70(Youtetsu.Youkasu No MonoshoUe Yasukata ,YouHagane.Youkasu Tomokazu TsuguNori,Tokyo:ISIJ,1971:70)
12Tsujino R, Nakashima J, Hirai M, Sawada I. ISIJ Int; 1989: 29(7):589
13Szatkowshi M,Tsai M C.Ironmaking Steelmaking,1991;17(4):65
14 Geiger G H,Poirier D R.Transport Phenomena in Metallurgy,Reading Mass:Addison-Wesley;1973:18
15饭田孝道,上田满,森田普一郎.铁钢,1977;63(4):163(Handa N,Kamita M,Morita H,Tetsu Hagane,1977; 63(4):163)
16 Komai T,Mizukami Y, Proc 7th International Conference on Vacuum Metallurgy,Tokyo:ISIJ,1982:1383
17桐原理,加藤嘉英,田口整司,藤井辙也,上原搏英,大宫茂CAMP—ISIJ,1992; 5:1239(Kirihara T, Kato Y, Taguchi H, Fujii W, Uehara H, Osora S. CAMP-ISIJ, 1992; 5: 1239) |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
