Use of magnesian fluxes of the Khalilovo deposit in sinter production

The article describes the magnesian fluxes properties of the Khalilovo deposit with different proportions of magnesite and serpentine. The results of laboratory experiments on the effect of these fluxes with various magnesite contents on the parameters of sintering process of the Kursk magnetic anomaly ores at JSC “Ural Steel” are presented. The use of experimental magnesian fluxes of the Khalilovo deposit increases the sinter strength, yield and sinter productivity. With the use of experimental fluxes instead of Bakal siderite, an increase in the sinter yield of 3  –  5  %  (rel.) can be reached. In addition, the sinter productivity increases from 1.04 to 1.08  –  1.15  t/(m2·h), that is, by 4  –  10  %  (rel.). The use of experimental magnesian fluxes increases the sinter strength: the tumbler index (+5  mm) increases by an average of 4  –  6  %  (abs.), and the abrasion index (–0.5  mm) decreases by 0.6  –  0.8  %  (abs.). Improving the strength characteristics of the sinter using magnesian fluxes of the Khalilovo deposit is due to the formation of “reinforcing” ferritic binder, as well as due to homogenization of the solidifying melt and its crystallization in the form of glass phase of the rankinite composition, which together limit the formation of β-Ca2SiO4 . The results of experimental sintering have confirmed the possibility of using experimental fluxes in the sintering production at sinter plant of JSC “Ural Steel” without changing the production technology. The rational variant for JSC “Ural Steel” is 50  % of magnesite of Khalilovo deposit in sinter rawmix. Replacement of the Bakal siderite in the production of sinter with 2  % of MgO on the magnesian flux of the Khalilovo deposit with 50  % of magnesite provides an increase in yield by 4  –  5  %, an increase in sinter strength by 5  –  6  % and an increase in sinter productivity by 8  –  10  % while keeping the iron content at the level of the “base” period.

1. Metallurgiya chuguna: Uchebnik dlya vuzov [Cast iron metallurgy: Textbook for universities]. Yusfin Yu.S. ed. Moscow: Akademkniga, 2004, 774 p. (In Russ.).

2. Dmitriev A.N., Shumakov N.S., Leont’ev L.I., Onorin O.P. Osnovy teorii i tekhnologii domennoi plavki [Basic blast furnace theory and technology]. Ekaterinburg: UrO RAN, 2005, 545 p. (In Russ.).

3. Malysheva T.Ya., Dolitskaya O.A. Petrografiya i mineralogiya zhelezorudnogo syr’ya: uchebnoe posobie dlya vuzov [Petrography and mineralogy of iron-ore raw materials]. Moscow: MISiS, 2004, 424 p. (In Russ.).

4. Yadav U.S., Ranjan A., Das B.K. etc. Evolution of sinter quality at “Tata Steel”. 5th Europ. Coke and Ironmaking Conf., Proceedings: Stockholm, SE, June 12-15, 2005. 2005, vol. 2, pp. 1–15.

5. Kryachko G.Yu., Belyaev Yu.V. Effect of slag composition on the operation of blast furnaces. Chernye metally. 2006, no. 3, pp. 17–22. (In Russ.).

6. Higuchi K., Takamoto Y., Orimoto T. etc. Quality improvement of sintered ores in relation to blast furnace operation. Shinnittetsu Giho. 2006, vol. 94, no. 06, pp. 036–041.

7. Shiau J.S., Liu S.H., Ho C.K. Effect of magnesium and aluminum oxides on fluidity of final blast furnace slag and its application. Materials Transactions. 2012, vol. 53, no. 8, pp. 1449–1455.

8. Yao L., Ren S., Wang X., Liu Q., Dong L., Yang J., Liu J. Effect of Al2O3 , MgO, and CaO/SiO2 on viscosity of high alumina blast furnace slag. Steel Research Int. 2016, vol. 87, no. 2, pp. 241–249.

9. Zhang X., Jiang T., Xue X., Hu B. Influence of MgO/Al2O3 ratio on viscosity of blast furnace slag with high Al2O3 content. Steel Research Int. 2016, vol. 87, no. 1, pp. 87–94.

10. Zhang K., Wu S., Huang W., Liu X., Zhu J., Du K. Effect of MgO on emergence of blast furnace primary slag with comprehensive furnace burden. In: 6th Int. Symposium on High-Temperature Metallurgical Processing. Jiang T. etc. eds. Springer, Cham, 2015, pp. 155–161.

11. Kim J., Lee Y., Min D., Jung S., Yi S. Influence of MgO and Al2O3 contents on viscosity of blast furnace type slags containing FeO. ISIJ International. 2004, vol. 44, no. 8, pp. 1291–1297.

12. Nakamoto M., Tanaka T., Lee J., Usui T. Evaluation of viscosity of molten SiO2–CaO–MgO–Al2O3 slags in blast furnace operation. ISIJ International. 2004, vol. 44, no. 12, pp. 2115–2119.

13. Panigrahy S.C., Rigaud M.A.J., Dilewijns J. The effect of dolomite addition on the properties of sinters produced from a high aluminous iron ore. Steel Research Int. 1985, vol. 56, no. 1, pp. 35–41.

14. Umadevi T., Roy A.K., Mahapatra P.C., Prabhu M., Ranjan M. Influence of magnesia on iron ore sinter properties and productivity – use of dolomite and dunite. Steel Research Int. 2009, vol. 80, no. 11, pp. 800–807.

15. Shapovalov A.N., Zavodyanyi A.V., Bratkovskii E.V. Use of metallic serpentito-magnisite ore from Khalilovo deposit for agglomerate production. Izvestiya. Ferrous Metallurgy. 2011, no. 3, pp. 25–29. (In Russ.).

16. Shapovalov A.N., Ovchinnikova E.V., Maistrenko N.A. Improving the preparation of the charge used for sintering at Ural Steel. Metallurgist. 2015, vol. 59, no. 3-4, pp. 204–211.

17. Shiroyan D.S., Gromova I.V., Elzhirkaev R.A. Studying the possibility of processing serpentine-magnesite raw materials from the Khalilovo deposit for magnesium sulfate. Uspekhi v khimii i khimicheskoi tekhnologii. 2014, vol. XXVIII, no. 5, pp. 122–125. (In Russ.).

18. Mineraly (spravochnik). T. IV., vyp. 1: Silikaty so strukturoi perekhodnoi ot tsepochechnoi k sloistoi, sloistye silikaty (kaolinovye mineraly, serpentiny, pirofillit, tal’k, slyudy) [Minerals (reference book).Vol. IV, issue 1: Silicates with structure transforming from chain-type to layer-type. Layer-type silicates (kaoline-type minerals, serpentine, profillite, talcum]. Chukhrov F.V. ed. Moscow: Nauka, 1992, 599 p. (In Russ.).

19. Raygan Sh., Abdizadeh H., Dabbagh A., Pourabdoli M. Influence of talc additive on cold strength and reducibility of iron ore sinters compared to bentonite. Ironmaking & Steelmaking. 2013, vol. 36, no. 4, pp. 273–278.

20. Umadevi T., Nelson K., Mahapatra P.C., Prabhu M., Ranjan M. Influence of magnesia on iron ore sinter properties and productivity. Ironmaking & Steelmaking. 2013, vol. 36, no. 7, pp. 515–520.

21. Yadav U.S., Pandey B.D., Das B.K., Jena D.N. Influence of magnesia on sintering characteristics of iron ore. Ironmaking & Steelmaking. 2013, vol. 29, no. 2, pp. 91–95.

22. Li T., Sun C., Liu X., Song S., Wang Q. The effects of MgO and Al2O3 behaviors on softening–melting properties of high basicity sinter. Ironmaking & Steelmaking. 2018, vol. 45. Issue 8, pp. 755–763.

23. Ovchinnikova E.V., Gorbunov V.B., Shapovalov A.N., Pisarev S.A., Durov L.N. Comparative study of the South Urals magnesium materials behavior at the sintering process temperature. Izvestiya. Ferrous Metallurgy. 2016, vol. 59, no. 11, pp. 814–820. (In Russ.).

24. Korotich V.I., Frolov Yu.A., Bezdezhskii G.N. Aglomeratsiya rudnykh materialov [Agglomeration of ore materials]. Ekaterinburg: UGTU-UPI, 2003, 400 p. (In Russ.).

25. Utkov V.A. Vysokoosnovnyi aglomerat [High-basicity sinter]. Mos-cow: Metallurgiya, 1977, 156 p. (In Russ.).

26. Malysheva T.Ya., Yusfin Yu.S., Gibadullin M.F., Korovushkin V.V., Mansurova N.R., Gostenin V.A. Effect of magnesium oxide on phase transformations and metallurgical properties of a highly basic sinter. Stal’. 2006, no. 10, pp. 4–6. (In Russ.).

27. Malysheva T.Ya., Pavlov R.M. Bundle mineral composition influence on basicity of sinter with different strength properties. Izvestiya. Ferrous Metallurgy. 2012, no. 11, pp. 6–10. (In Russ.).

28. Ovchinnikova E.V., Shapovalov A.N., Gorbunov V.B. Specific features of MgO behavior during sintering with the use of silderites of the Bakal deposit. Chernaya metallurgiya. Byul. in-ta “Chermetinformatsiya”. 2016, no. 11 (1403), pp. 30–33. (In Russ.).