Lipetsk State Technical University (Lipetsk, Russia):

A. P. Zhiltsov, Cand. Eng., Associate Prof., Head of the Department «Metallurgical equipment», e-mail: kaf-mo@stu.lipetsk.ru

Donbass State Technical University (Alchevsk, Lugansk People’s Republic | Ukraine):
D. A. Vlasenko, Senior Lecturer, Dept. «Machines of the Metallurgical Complex»
E. P. Levchenko, Cand. Eng., Associate Prof., Dept. «Machines of the Metallurgical Complex»

The practical experience of using hammer crushers in fractional preparation of charge materials in sinter production indicates that the quality of crushed flux has a significant impact on the performance of the charge materials sintering process and on physical and metallurgical properties of the sinter. Based on the Hooke’s law of elasticity, the Bond grinding hypothesis, and the Hertz static theory of impact, a mathematical model of the process of crushing material by applying a free impact has been developed. An analytical dependence of one of the main indicators of the dispersion process — the degree of crushing — on the hammers row mass, radius of the hammer mass center, length of its working face, radius of rotor’s suspension axes, material penetration depth into the working area, average particle diameter of the crushed raw material, and rotor’s angular rotation speed, elastic modulus of crushed material and operating coefficient has been determined. To confirm the reliability of the obtained dependence using various methods of installing hammers on the rotor’s suspension axis, a multivariate industrial experiment for the limestone dispersion in the hammer mill was conducted. Based on experimental data, the regression dependence of the degree of limestone grinding in the hammer mill on the impact bodies mass, and the initial fraction of the raw material was obtained. The conducted experimental studies showed a convergence with theoretical results at the level of 95% indicating the reliability of the adopted mathematical model. As a result, the effect of the total mass of hammers exerting the impact interaction upon the material on the efficiency of the dispersion process during fractional preparation of the sinter mixture was determined. The design of the proposed new combined method for fastening hammers on the rotor’s suspension axis, aimed at improving the crushing complex and allowing to increase the product yield by raising the limestone crushing degree by 1.8–3.3 times has been theoretically and experimentally substantiated.

1. Turgunova K. K., Timirbaeva N. R., Kθbegen E. et al. The research of autohesion properties of sintering burden. CIS Iron and Steel Review. 2018. Vol. 15. pp. 4–10.
2. Treatise on Process Metallurgy. Vol. 3: Industrial Processes. Editor–in–Chief S. Seetharaman. Elsevier. 2014. 1751 p.
3. Fernández-González D., Ruiz-Bustinza I., Mochón J. et al. Iron Ore Sintering: Raw Materials and Granulation. Mineral Processing and Extractive Metallurgy Review. 2017. Vol. 38. No. 1. pp. 36–46.
4. Vaisberg L. A., Korovnikov А. N., Podgorodetskiy G. S. Improvement of charge preparation systems in blast furnace practice. Chernye Metally. 2017. No. 8. pp. 24–27.
5. Shapovalov A. N., Ovchinnikova Е. V., Maystrenko А. N. Effect of the type of magnesia materials on the sintering process indicators at «Ural Steel» JSC. Chernye Metally. 2018. No. 11. pp. 38–42.
6. Titov V. N., Ivleva L. S., Pishikin А. А. The use of low-sized fractions of agglomerate and coke in the conditions of intensive work of blast furnaces. Chernaya metallurgiya. Byulleten nauchno-tekhnicheskoy i ekonomichesloy informatsii. 2017. No. 5. pp. 28–33.
7. Becker М. Mixing and granulating of agglomerate in the metallurgical industry. Chernye Metally. 2016. No. 4. pp. 25–27.
8. Mansurova N. R. Effect of genesis and charge basicity on the mineralogical composition and metallurgical properties of agglomerate: thesis of inauguration of Dissertation …of Candidate of Engineering Sciences: 05.16.02. MISiS. Moscow, 2007. 26 p.
9. Korotich V. I., Frolov Yu. А., Bezdezhsky Т. N. Agglomeration of ore materials. Ekaterinburg: GOU VPO «UGTU–UPI», 2003. 400 p.
10. Umadevi T., Mahapatra P. B., Bandopadhyay U. K. et al. Influence of limestone particle size on iron ore sinter properties and productivity. Steel Research International. 2010. Vol. 81. Iss. 6. pp. 419–425.
11. Higuchi K., Tanaka T., Tsuyoshi T., Takehiko S. Reaction Behavior of Dolomite Accompanied with Formation of Magnetite Solid Solution in Iron Ore Sintering Process. ISIJ International. 2007. Vol. 5 (47). pp. 669–678.
12. Subba Rao D. V. Minerals and Coal Process Calculations. London : Taylor & Francis Group, 2016. 354 p.
13. Lakshmi Shamvardhini Sydanna T. R. Manufacturing with design and analysis of rotor shaft of hammer mill crusher. International Journal of Science. Engineering and Technology Research (IJSETR). 2017. No. 5. pp. 877–881.
14. Iskanderov R. R., Lebedev А. Т. Hammer crushers: advantages and disadvantages. Vestnik APK Stavropolya. 2015. No. 1 (17). pp. 27–30.
15. Vlasenko D. А., Pavlinenko О. I., Levchenko E. P. Energy consumption of hammer crushers with fixed and hinged fasteners of beaters to a rotor. Vestnik DonNTU. 2016. No. 3. pp. 21–26.
16. Eliseev S. V., Zagoruiko M. G., Rybalkin D. A. et al. Determination of speed range of hammer mill grinder. ARPN Journal of Engineering and Applied Sciences. 2018. Vol. 13, No. 8. pp. 2846–2849.
17. Vlasenko D. A., Karpov A. V. Hammer crusher rotor. Patent RF No. 179695. Applied: 22.02.2018. Published: 22.05.2018. Bulletin No. 13.
18. Kochetkov A. V., Fedotov P. V. Several problems of shock theory. Naulovedenie (Internet journal). 2013. No. 5. [Electronic resource]. Available at: https://naukovedenie.ru/PDF/110tvn513.pdf (accessed: 26.08.2019).
19. Rossikhin Yu. A., Shitikova M. V., Duong T. M. Analysis of the collision of two elastic spherical shells. Mechanics, Energy, Environment. Energy, Environment and Structural Engineering Series. 2015. Vol. 42. pp. 107–111.
20. Vlasenko D. А., Levchenko E. P. Effect of raw material size on kinematic of work members and material in a hammer crusher. Vestnik DonNTU. 2018. No. 3. pp. 9–15.
21. GOST 12376–71. Single rotor crusher for medium and small grinding. Specification. Introduced: 01.01.1973.
22. Belay G. Е., Dembovsky V. V., Sotsenko О. V. Organization of metallurgical experiment: tutorial for universities. Moscow: Metallurgiya, 1993. 256 p.
23. Vlasenko D. А., Levchenko E. P., Bilan G. A. Mathematical modeling of the process of hammer attrition when grinding the material by free impact. Vestnik DonNTU. 2019. No. 1 (15). pp. 8–16.