St. Petersburg Mining University (St. Petersburg, Russia):

A. V. Kornev, Cand. Eng., Associate Prof., Head of lLboratory, Dept. of Industrial Safety, e-mail: kornev_opi@mail.ru
V. B. Kuskov, Cand. Eng., Associate Prof., Dept. of Mineral Processing, e-mail: opikvb@mail.ru
V. Yu. Bazhin, Dr. Eng., Prof., Vice-Rector on Science and Innovations, e-mail: bazhin-alfoil@mail.ru

Agglomeration is widely used in ferrous and non-ferrous metallurgy to prepare small-sized ores and finely ground concentrates for smelting. One of the methods of agglomeration is briquetting, which can be done with or without binders. For briquetting with binders, roll presses are usually used. An alternative to roll presses can be extrusion presses, the main advantages of which are obtaining very durable raw extrudates, possibility of processing wetter materials to produce briquettes of various sizes and shapes, as well as low capital and operating costs. The prospects of using the extrusion pressing method for agglomeration of iron ores have been shown. In particular, the effectiveness of application of this method for briquetting rich loose polydispersed iron ores with the aim of subsequent use of the obtained lump product in the composition of a metallurgical charge has been proved. Briquetting was carried out with binders. The results of studies of strength and other properties of extruded briquettes were presented. The physical and mechanical properties of the obtained extruded briquettes meet the requirements, which allows to use them as raw materials for the metallurgical industry.

1. Fernandez-González D., Mochon J., Ruiz-Bustinza I. et al. Iron ore sintering: Process. Mineral Processing and Extractive Metallurgy Review. 2017. Vol. 38 (4). pp. 215–227.
2. Kasai A., Nozawa K., Toyota H., Kitayma S. et al. Reduction of reducing agent rate in blast furnace operation by carbon composite iron ore hot briquette. ISIJ international. 2011. Vol. 51 (8). pp. 1333–1335.
3. Narita C. Y., B. Mourao M., Takano C. Development of composite briquettes of iron ore and coal hardened by heat treatment. Ironmaking & Steelmaking. 2015. Vol. 42 (7). pp. 548–552.
4. Wang H., Zhao W., Chu M., Wang R. et al. Fundamental research on iron coke hot briquette — A new type burden used in blast furnace. Ironmaking & Steelmaking. 2016. Vol. 43 (8). pp. 571–580.
5. Zhu D., Shi B., Pan J., Zhang F. Effect of pre-briquetting on the granulation of sinter mixture containing high proportion of specularite concentrate. Powder Technology. 2018. Vol. 331. pp. 250–257.
6. Polat G., Yilmazer D. K., Sarıdede M. N. Reduction Conditions of Briquetted Solid Wastes Generated by the Integrated Iron and Steel Plant. Int. J. Chem. Mol. Nucl. Mater. Metall. Eng. 2016. Vol. 10. No. 4. pp. 422–425.
7. Ugarov А. А., Ismagilov R. I., Mikhailov О. Yu., Solodukhin А. А. et. al. Full-scale reconstruction of the production facilities to provide the supply of the third HBI plant at Lebedinsky GOK (Lebedinsky Iron Ore Combine, JSC). Chernye Metally. 2016. No. 12. pp. 13–16.
8. Puzakov P. V., Kozub A. V., Ugarov A. A. et al. Technological parameters determining physical-chemical properties and required quality of green pellets at the roasting machine No. 3 of PJSC «Mikhailovsky GOK». CIS Iron and Steel Review. 2017. Vol. 14. pp. 4–8.
9. Drobíková K., Plasha D., Motyka O. et al. Recycling of blast furnace sludge by briquetting with starch binder: waste gas from thermal treatment utilizable as a fuel. Waste management. 2016. Vol. 48. pp. 471–477.

10. Lurie L. А. Briquetting in metallurgy. Moscow: Metallurgizdat. 1963. 324 p.
11. Eisele T. C., Kawatra S. K. A review of binders in iron ore pelletization. Mineral Processing and Extractive Metallurgy Review. 2003. Vol. 24. Iss. 1. pp. 1–90.
12. Nath S. K., Rajshekar Y., Alex T. C. et al. Evaluation of the Suitability of Alternative Binder to Replace OPC for Iron Ore Slime Briquetting. Transactions of the Indian Institute of Metals. 2017. Vol. 70. Iss. 8. pp. 2165–2174.
13. Kurunov I. F., Bizhanov А. М. Brexes is a new stage in agglomeration of raw materials for blast furnaces. Metallurg. 2014. No. 3. pp. 49–53.
14. Bizhanov А. М., Kurunov I. F., Dashevsky V. Ya. On the mechanical strength of extrusion briquettes (brexes) for blast furnace and ferroalloy production. I. The dependence of the strength properties of extrusion briquettes on a binder. Metally. 2015. No. 2. pp. 19–25.
15. Sergeev S. V., Lyabakh А. I., Zaytsev D. А. Experience in the development of rich iron ores of the Yakovlevsky KMA deposit. Nauchnye vedomosti BelGU. Seriya: Estestvennye nauki. 2011. No. 3 (98). Issue. 14. pp. 200–208.
16. Kuskov V. B., Kornev A. V. Briquettes for metallurgical industry. CIS Iron and Steel Review. 2011. Vol. 6. pp. 6–7.
17. Kuskov V. B., Kornev А. V., Sukhomlinov D. V. Briquetting of iron ore for the metallurgical industry. Zapiski gornogo instituta. 2013. Vol. 202. pp. 111–114.
18. Kornev А. V. Unfired agglomeration of polydisperse iron ores using binders: thesis of inauguration of Dissertation … of Candidate of Engineering Sciences. Saint Petersburg, 2013. 21 p.
19. GOST 17212–84. Iron ores, agglomerates and pellets. Method for determination of reductability. Introduced: 01.01.1986.
20. GOST 26517–85. Iron ores, agglomerates and pellets. Method for determination of initial softening point and temperature range of softening. Introduced: 01.01.1986.
21. Argimbaev К. R., Kornev А. V., Kholodnyakov G. А. Substantiation of the possibility of involving iron-containing tailings in processing with subsequent agglomeration of obtained concentrates. Zapiski gornogo instituta. 2013. Vol. 206. pp. 120–124.
22. Korchevenkov S. A., Aleksandrova T. N. Preparation of Standard Iron Concentrates from Non-Traditional Forms of Raw Material Using a Pulsed Magnetic Field. Metallurgist. 2017. Vol. 61. Iss. 5–6. pp. 375–381.
23. Aleksandrova T. N., Lvov V. V. The use of High-Gradient magnetic separation to increase the efficiency of extraction of magnetic fraction from coal combustion waste. 16^th International Multidisciplinary Scientific GeoConference SGEM 2016. June 28 — July 6. 2016. Book 4. Vol. 2. pp. 165–170.
24. Vaisberg L. A., Kuskova Ya. V. Improvement of circular concentrating tables as development of gravity concentration methods. Obogashchenie Rud. 2017. Iss. 4. P. 54–60. DOI: 10.17580/or.2017.04.10.