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Steel production
ArticleName Influence of the gap between the rolls on parameters of the roll briquetting of metallurgical lime and magnesium oxide
DOI 10.17580/chm.2022.06.02
ArticleAuthor N. A. Babailov, Yu. N. Loginov, L. I. Polyansky
ArticleAuthorData

Institute of Engineering Sciences (IMASH) named after E. S. Gorkunov, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia:

N. A. Babailov, Cand. Eng., Senior Researcher, Laboratory of Applied Mechanics, e-mail: n.a.babailov@urfu.ru


Ural Federal University named after the first President of Russia B.N. Eltsin, Ekaterinburg, Russia:
Yu. N. Loginov, Dr. Eng., Professor, Dept. of Metal Forming


CJSC Spaydermash, Ekaterinburg, Russia:
L. I. Polyansky, Director

Abstract

The results of experimental studies carried out on two types of slag-forming materials widely used in ferrous metallurgy: metallurgical lime (calcium oxide CaO) and magnesium oxide (soft-burned magnesite or brucite, MgO) are presented. It is determined that these materials are well compacted by the method of "dry" briquetting (briquetting without binder and moisture), with obtaining sufficiently strong briquettes. The influence of the technological parameter of roller briquetting - the gap between the working rolls (bandages) of the briquetting press on the density, open porosity and relative performance of the roller press was studied. The probability of occurrence of cracks on the surface and in the volume of the briquette was studied. The dependences of the current density of the material being briquetted (CaO and MgO) on the pressing pressure, the so-called compression curves, have been determined. The change in the density of the briquette from the size of the gap between the rolls of the press, equal to the thickness of the bridge between the briquettes, is determined. The influence of the gapbetween the rolls on the relative productivity of the roller press in terms of mass and volume is presented. The relative performance, reduced to one received briquette, is determined. The results obtained are approximated by simple mathematical functions. The density of the briquettes is represented by an exponential function, and the results for the open porosity of the magnesia briquettes and the relative performance of the roller press are exponential functions.

The work was carried out within the framework of theme No. 0391-2016-0001 (АААА-А18-118020790140-5) and with the partial financial support of Decree No. 211 of the Government of the Russian Federation, contract No. 02.A03.21.0006.

keywords Roller briquetting, briquette, magnesium oxide, metallurgical lime, calcium oxide, pressing pressure, density, porosity, compression curve, productivity, brucite
References

1. Bizhanov A. M., Aubertot C. Sintering and Briquetting Synergy in Blast Furnace Smelting. Metallurgist. 2021. Vol. 65. pp. 699–712.
2. Agrawal R. K., Pandey P. K. Productive recycling of basic oxygen furnace sludge in integrated steel plant. Journal of Scientific and Industrial Research. 2005. Vol. 64, Iss. 9. pp. 702–706.
3. Tripathy H. K., Murthy B. V. R., Swamy Y. V., Mohanty J. N., Tripathy A. K. Briquetting of steel plant wastes suitable for charging in blast furnace. Journal of Mines, Metals and Fuels. 2008. Vol. 56. No. 1-2. pp. 28–32.
4. Babailov N. A., Polyanskiy L. I., Loginov Y. N. Briquetting Metallurgical Lime Screenings and Parameters Making it Possible to Improve Process Efficiency. Metallurgist. 2016. Vol. 60. pp. 576–580.
5. Technical specification 3821-001-50316524–2004. Briquetting roller presses of PBV series.
6. Technical specification 21-05764417-276–96. Metallurgical lime.
7. Babaylov N. A., Loginov Y. N., Polyanskiy L. I. Nature of fine materials compaction when roll briquetting in cells of different shapes. Chernye Metally. 2021. No. 2. pp. 39–44.
8. Babailov N. A., Loginov Y. N., Polyanskiy L. I. Determination of the angle of bite during roll briquetting of finely dispersed materials. Chernye Metally. 2020. No. 2. pp. 52–56.
9. Demidov К. N., Lamukhin А. М., Shatilov О. F. et. al. Steelmaking in converters using fluxes with a high content of magnesium oxides. Novye ogneupory. 2005. No. 5. pp. 13–21.
10. Kashcheev I. D., Terentyev E. A., Demidov K. N., Borisova T. V., Maryasev I. D. Properties and structure of magnesia modifiers for converter slags. Refractories and Industrial Ceramics. 2007. Vol. 48, Iss. 1. pp. 17–22.
11. Osipov V. A., Kungurtsev V. N., Stepanova E. V., Timofeeva Z. G., Bosyakova N. A. Composition and fabrication of magnesia briquettes from refractory scrap for repairing the lining of oxygen converters. Refractories and Industrial Ceramics. 2005. Vol. 46, Iss. 2. pp. 87, 88.
12. Li X. F., Liu Y. Q., Li H., Jiang Y., Ma H. W. Effects of briquette forming condition on the extraction of magnesium from calcined magnesite via vacuum aluminothermic reduction. Materials Science Forum. 2016. Vol. 849 pp. 168–172.
13. Jarnerud T., Karasev A. V., Jönsson P. G. Briquetting of wastes from pulp and paper industries by using AOD converter slag as binders for application in metallurgy. Materials. 2019. Vol. 12, Iss. 18. No. 2888. pp. 1–12.
14. Lanzerstorfer C., Brunner C. Agglomeration of iron-bearing fines: Selection of the binder for optimal briquette strength under various environments. METAL 2020 – 29th International Conference on Metallurgy and Materials, Conference Proceedings. 2020. pp. 31–36.
15. De Gisi S., Romaniello L., Dalessandro M., Todaro F., Notarnicola M. Recovery of iron rich residues from integrated steel making process by hydrated lime/molasses pressurised cold agglomeration. Journal of Cleaner Production. 2019. Vol. 233. P. 830–840.
16. Zhang Z., Lian F., Mа L., Jiang Yu. Effects of quicklime and iron tailings as modifier on composition and properties of steel slag. Journal of Iron and Steel Research International. 2015. Vol. 22. pp. 15–20.
17. GOST 25471–82. Iron ores, concentrates and pellets. Method for the determination of solidity on droption. Introduced: 01.07.1983.
18. GOST 26450.1–85. Rocks. Method for determination of open porosity coefficient by fluid saturation. Introduced: 01.07.1986.

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