Recovery of Iron from High-Iron Hot Rolled Mill Scales by Direct Reduction Technique

Yıl 2021, Cilt: 9 Sayı: 2, 581 - 590, 25.04.2021

Engin Çevik

https://doi.org/10.29130/dubited.841486

Öz

In this study, the integrated iron and steel plant mill scales prepared to concentrate in different ratios by blending with hematite character ore. CMC was used as binder and coke will be used as reductant. The calcite was added in such a way that the basicity ratio is 0.7. The pelletizing machine was pellet the blends containing the mill scales at different ratios and then drying at a temperature of 150 °C. 28 kg / pellet compressive strength was obtained in the pellets prepared from 100% mill scales. As the amount of ore increased, 45 kg / pellet was reached with a 50% increase in compressive strength. After compression tests, dried pellets were subjected to reduction at 3 different temperatures (1200, 1300 and 1400 C) and their reduction degrees were calculated based on oxygen loss. The highest reduction degree (82%) was obtained at 1400 ° C from the completely prepared with mill scales.

Anahtar Kelimeler

Mill scales, Direct reduction, Hematite

Destekleyen Kurum

Karabük Üniversitesi

Proje Numarası

KBÜBAP-17-YL-270

Teşekkür

This research was financially supported by the Scientific Research Projects Coordination Unit of Karabuk University grant no. KBÜBAP-17-YL-270.

Doğrudan İndirgeme Tekniğiyle Yüksek Demirli Sıcak Haddehane Tufalinden Demirin Geri Kazanımı

Öz

Bu çalışmada, hematit karakterli demir cevheri ile entegre demir çelik fabrikası haddehane tufali farklı oranlarda harmanlanarak hazırlanmıştır. Bağlayıcı olarak CMC ve indirgeyici olarak ise kok kullanılmıştır. Baziklik oranı 0.7 olacak şekilde kalsit ilave edilmiştir. Peletleme makinesi ile farklı oranlarda haddehane tufali içeren karışımlar pelet haline getirilmiş ve ardından 150 ° C’de kurutulmuştur. % 100 haddehane tufalinden hazırlanan peletlerde 28 kg / pelet basma dayanımı elde edilmiştir. Cevher miktarı arttıkça basma dayanımında % 50 artışla 45 kg / pelet’e ulaşılmıştır. Basma testlerinden sonra, kurutulmuş peletler 3 farklı sıcaklıkta (1200, 1300 ve 1400 oC) indirgenmeye tabi tutulmuş ve oksijen kaybına göre indirgenme dereceleri hesaplanmıştır. En yüksek indirgenme derecesine (% 82) 1400 oC 'de tamamen haddehane tufali ile hazırlanan peletlerde ulaşılmıştır.

Anahtar Kelimeler

Haddehane tufali, Doğrudan indirgenme, Hematit

Proje Numarası

KBÜBAP-17-YL-270

Kaynakça

• 1. G. Doğantepe, “Investigation of hematite iron ores and blast furnace dusts's availability in the sponge iron production, Master Thesis, Karabük University, Karabük, 2013.
• 2. L. Yi, Z. Huang, T. Jiang, R. Zhong, Z. Liang, “Iron ore pellet disintegration mechanism in simulated shaft furnace conditions” Powder Technol. 317, 89-94, 2017.
• 3. E. Cevik, H. Ahlatci, Y.Sun “Characterization and reduction behavior of cold-bonded composite pellets for direct reduction usıng an organic binder” Metallurgist, 57, No. 5-6, 468-477 , 2013.
• 4. S. Devasahayam, “A novel iron ore pelletization for increased strength under ambient conditions” Sustainable Materials and Technologies, 17, 1-7, 2018.
• 5. S. Sengupta, “Indian iron ore industry in global perspective”, Steelworld, 10-17, 2006.
• 6. C. Rubach, “World steel recycling in figures 2006 – 2010 steel scrap – a raw material for steelmaking”, Bureau of International Recycling, Brussels, 1-20, 2011.
• 7. T. C.Eisele and Kawatra, S.K., “A review of binders ın ıron ore pelletizatıon”, Mineral Processing & Extractive Metalurgy Review, 24 (1): 1-89, 2003.
• 8. I.Kaboyashi, Y. Tanigaki and A. Uragami, “A new process to produce iron directly form fine ore and coal” Ironmaking Conference Proceedings, Osaka, 649-657, 2001.
• 9. I. F. Kurunov “The direct production of iron and alternatives to the blast furnace in iron metallurgy for the 21st century” Metallurgist, 54, No. 5-6, 335-342, 2010.
• 10. K. S. Singh and T. Krishnan , “Reduction kinetics of iron ore pellets and the effect of binders” Master Thesis, Department of Metallurgical and Materials Engineering National Institute of Technology, Rourkela, 38, 2008.
• 11. R.Robinson, “High temperature properties of by-product cold bonded pellets containing blast furnace flue dust” Thermochimica Acta, 432 (1), 112-123 , 2005.
• 12. B. Anameric and S.K Kawatra, “The microstructure of the pig iron nuggets”, ISIJ International, 47 (1), 53-61, 2007.
• 13. B. Birol, , “The production of composite pellets and iron nuggets from Divrigi pellet concentrate” Master Thesis, Yıldız Technical University, İstanbul, 37, 2007.
• 14. G. Önkibar, “Pig iron production by direct reduction method from integrated iron and steel plant’s mill scales” Master Thesis, Sakarya University, Sakarya, 114, 2006.
• 15. B.B. Agrawal, K.K.Prasad, S.B. Sarkar and H.S. Ray, “Cold bonded ore–coal composite pellets for sponge ironmaking Part 1 Laboratory scale development”, Ironmaking Steelmaking, 27 (6), 421-425, 2000.
• 16. R. Robinson, , “High temperature properties of iron and steelmaking by-product cold bonded pellets”, Nordic Recycling Day, Mimer Cıru Centre, Sweden, 1-15, 2005.
• 17. E.Mousa, D. Senk and A. Babich, “Reduction of pellets-nut coke mixture under simulating blast furnace conditions” Steel Research Int., 81 (9), 706-715, 2010.