EVALUATION OF THE INDICATORS OF THE PROCESSES OF LADDLE DESULFURATION OF CAST IRON USING VARIOUS REAGENTS AND THEIR INDUSTRIAL VERIFICATION

  • Anatoliy Shevchenko Iron and Steel Institute of Z. I. Nekrasov of National Academy of Sciences of Ukraine, Dnipro, Ukraine https://orcid.org/0000-0003-0867-6825
  • Ivan Manachyn Iron and Steel Institute of Z. I. Nekrasov of National Academy of Sciences of Ukraine, Dnipro, Ukraine https://orcid.org/0000-0001-9795-6751
  • Borys Dvoskin Iron and Steel Institute of Z. I. Nekrasov of National Academy of Sciences of Ukraine, Dnipro, Ukraine https://orcid.org/0000-0003-2891-7833
  • Oleksandr Bashmakov "TITANPROEKT", Zaporizhzhya, Ukraine
  • Olexander Vergun Iron and Steel Institute of Z. I. Nekrasov of National Academy of Sciences of Ukraine, Dnipro, Ukraine
  • Volodymyr Kislyakov Iron and Steel Institute of Z. I. Nekrasov of National Academy of Sciences of Ukraine, Dnipro, Ukraine https://orcid.org/0000-0002-1775-5050
  • Serhiy Shevchenko Iron and Steel Institute of Z. I. Nekrasov of National Academy of Sciences of Ukraine, Dnipro, Ukraine
Keywords: out-of-furnace desulfurization of cast iron, powdered lime, granular magnesium, reagent consumption, desulfurization efficiency

Abstract

The purpose. For an objective technical and economic assessment of the 3 pig iron desulphurization technologies, a complex of comprehensive studies of the indicators of out-of-furnace treatment of pig iron was carried out under the same and equivalent refining conditions for 2 groups of ladles - with a mass of pig iron of 80-120 tons and more than 200 tons (heavy-duty ladles).
Results. It is shown that one of the main parameters and indicators is the reagent consumption, which determines all the main indicators of the process. A comparative analysis of the indicators in Table 1 also indicates that in the KR process, an increase in the mass of iron in the ladle reduces the efficiency of desulfurization, since the transition from ladles with an iron mass of 80 and 100 tons to large ladles (260 tons) is accompanied by a decrease in the specific degree of desulfurization. removal increases reagent consumption per unit of sulfur removed. Significant specific consumption of reagents (up to 8-17 kg/t of pig iron) and the duration of mixing (up to 8-20 min), as well as the cycle – up to 25-68 min, which causes noticeable temperature losses of pig iron - an average of 40-42 °C, and in a number of desulfurization modes - up to 92-128 °C. This is due to the fact that with an increase in the mass of cast iron, the mass transfer processes between the slag and the liquid iron of the ladle worsen. The highest specific consumption of reagents in the KR process resulted in the highest costs in the implementation of this process. The lowest specific costs for monoinjection of magnesium determine the lowest costs for the industrial development of this process. The actual indicators of industrial purges indicate about. that monoinjection of granular magnesium is characterized by the lowest cost of reagents - an average of 0.42-0.55 kg/t of pig iron, the shortest duration of the desulfurization operation – an average of 5.5-7.7 minutes and at the same time providing up to super deep desulfurization of pig iron – up to 0.0003-0.001 %, degree of desulfurization – up to 99 %, high intensity of sulfur removal - on average 12-14.4%/min., high degree of assimilation of the reagent – on average 75-92 %.
Originality. Nomograms for determination and prediction of specific costs of different reagents in different processes and ladles depending on the variable initial sulfur content in cast iron and its set final value are presented.
Practical implications. The presented actual data on the technology applied KR-processes (CaO+CaF2), co-injection of lime with magnesium (CaO+Mg) and mono-injection of granular magnesium according to the Ukrainian blowing technology. The costs for desulfurization processes KR - co-injection - mono-injection are in the ratio 3:2:1. The advantage of injection processes for desulfurization of cast iron is substantiated.

References

Kudrin, V. A. (1992). Vnepechnaia obrabotka chuguna i stali. Moskva: Metallurgiia

Shevchenko, A. F., Bolshakov, V. I., & Bashmakov, A. M. (2011). Tekhnologiia i oborudovanie desulfuratcii chuguna magniem v bolshegruznykh kovshakh. - Kyiv: Naukova dumka

Voronova, N. A. (1980). Desulfuratciia chuguna magniem. Moskva: Metallurgiia

USh Mezhdunarodnyi simpozium po Desulfuratcii chuguna i stali. (2004). Sb. dokladov. Nizhnii Tagil

In, Zhui Iu. (2008). Otechestvennoe staleplavilnoe proizvodstvo - obzor sostoianiia i razvitie tekhnologii do 2010 g. // In: sb. nauch. tr. vsekitaiskoi konf. "Vyplavka i nepreryvnaia razlivka stali". Khanchzhou, KNR, 1-13

Stepanov, A. A., Lamukhin A. M., Zinchenko, S.D. et al. (2004). Osvoenie tekhnologii proizvodstva stalei s ispolzovaniem ustanovki desulfuratcii chuguna v usloviiakh konverternogo proizvodstva OAO «Severstal». In: VIII Simpozium po desulfuratcii chuguna i stali. Nizhnii Tagil, 83-87.

Zborshchik, A. M., Kuberskii, S. V., Kosolap, N. V. et al. (2011). Effektivnost ispolzovaniia reagentov v sovremennykh protcessakh vnedomennoi desulfuratcii chuguna. Biul. "Chernaia metallurgiia", (12), 35-41

Shevchenko, A. F., Bashmakov, A. M., Manachin, I. A. et al. (2013). Tekhniko-ekonomicheskoe sopostavlenie protcessov vnepechnoi desulfuratcii chuguna po rezultatam ikh promyshlennogo osvoeniia. Chernaia metallurgiia. Biull. Chermetinformatciia, (10), 9-13

Brodskii, S. S., Uchitel, L. M., Nesvet, V. V. et al. (1999). Povyshenie effektivnosti desulfuratcii chuguna poroshkovoi izvestiu. Metall i lite Ukrainy, (3-4), 34-37

Zborshchik, A. M., Kuberskii, S. V., Dovgaliuk, G. Ia. et al. (2011). Effektivnost ispolzovaniia fliuidizirovannoi izvesti dlia desulfuratcii chuguna v 300- tonnykh zalivochnykh kovshakh. Stal, (9), 16-19

Shevchenko, A. F., Manachin, I. A., Vergun, A. S. et al. (2017). Vnepechnaia desulfuratciia chuguna v kovshakh. Tekhnologiia. Issledovaniia. Analiz. Sovershenstvovanie. Dnepropetrovsk: Dnіpro –VAI»

Zborshchik, A. M., Kuberski,i S. V., & Kosolap, N. V. (2011). Effektivnost ispolzovaniia reagentov v sovremennykh protcesakh vnedomennoi desulfuraitci chuguna. Cher. metallurgiya, (12), 35-40

Shevchenko, A. F. (2011). Kompleksnaia otcenka razlichnykh tekhnologii vnepechnoi desulfuratcii chuguna. Chernaia metallurgiia. Biull. Chermetinformatciia, (7), 33-41

Ushakov, A. N., Bigeev, V. A., Stoliarov, A. M., & Potapova, M. V. (2019). Tekhnologiia proizvodstva trubnoi ultranizkosernistoi stali. Chernye metally, (12), 26-31

Ushakov, S. N., Bigeev, V. A., Stolyarov, A. M. & Potapova, M.V. (2018). Ladle Desulfurization of Converter Low-Sulfur Pipe Steel. Metallurgist, Springer (USA), 62, 667-673

Ushakov, S. N., Avramenko, V. A., Bigeev, V. A., Stolyarov, A. M. & Potapova, M. V. (2018). Manufacture of Low-Sulfur Pipe Steel with Ladle Desulfurization of Cast Iron. Metallurgist, Springer (USA), 61, P.967-970

Bigeev, V. A., Nikolaev, A. O. & Brusnikova, A. V. (2014). Production of low-sulfur steel with limited hydrogen content. Steel in Translation, Springer (USA), 44, 272-275

Kravetc, A. N. (2002). Razrabotka energosberegaiushchei tekhnologii rafinirovaniia chuguna v zalivochnom kovshe s odnovremennym udaleniem kremniia i sery. Kand. diss. Dneprodzerzhinsk-Dnepropetrovsk. Institut chernoi metallurgii.

Shevchenko, A. F., Bashmakov, A. M., Manachin, I. A. et al.(2013). Tekhniko-ekonomicheskoe sopostavlenie protcessov vnepechnoi desulfuratcii chuguna po rezultatam ikh promyshlennogo osvoeniia. Chernaia metallurgiia, Biull. Chermetinformatciia. (10), 9-13

Stepanov, A. A., Zinchenko, S. D., Lamukhin, A. I. et al. (2004). Osvoenie tekhnologii proizvodstva stali s ispolzovaniem ustanovki desulfuratcii chuguna v usloviiakh konverternogo proizvodstva OAO «Severstal». Trudy VIII Mezhd. simpoziuma po desulfuracii chuguna i stali. Nizhnij Tagil, Russia, 83-87

Ushakov, S. N., Avramenko, V. L., Bicheev, V. A., Stoliarov, A. M., & Potapova, M. V. (2017). Proizvodstvo trubnoi nizkosernistoi stali s kovshevoi desulfuratciei chuguna. Metallurg, (11), 47-61

Smirnov, A. N., & Zborshchik, A. M. (2012). Vnepechnoe rafinirovanie chuguna i stali. Donetck. GUVZ DonNTU

Published
2021-09-30
How to Cite
Shevchenko, A., Manachyn, I., Dvoskin, B., Bashmakov, O., Vergun, O., Kislyakov, V., & Shevchenko, S. (2021). EVALUATION OF THE INDICATORS OF THE PROCESSES OF LADDLE DESULFURATION OF CAST IRON USING VARIOUS REAGENTS AND THEIR INDUSTRIAL VERIFICATION. Metallurgical and Ore Mining Industry, (3), 56-73. https://doi.org/10.34185/0543-5749.2021-3-56-73