Abstract
The thermal stresses in three types of iron-ore pellets with differentiated porosity are compared. The thermal stress of pellets obtained by the spraying of wet batch onto the batch coating and onto pelletized materials is analyzed. The influence of the porosity and thermal mass of the pellets on the thermal-stress distribution over the pellet cross section is determined. The variation in the strength of pellets with differentiated porosity over the cross section is assessed in the presence of a dynamic temperature field over the porous sphere. The role of the thermal mass in the core and shell of the pellet is also evaluated. The action of thermal stress in activating the sintering of iron-ore pellets is analyzed. Recommendations for improving the thermal conditions in pellet roasting are outlined. The best pore structure is obtained by forced nucleation of pellets, which results in elevated porosity in the core.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Yaroshenko, Yu.G., Pavlovets, V.M., Trofimov, N.I., Shvydkii, V.S., Lobanov, V.I., and Maizel’, S.G., Thermo-stressed state of iron-ore pellets in the initial stage of sintering, Izv. Vyssh. Uchebn. Zaved., Chern. Metall., 1987, no. 10, pp. 102–105.
Melamud, S.G. and Yur’ev, B.P., Stress calculation in roasted iron-ore pellets on cooling, Steel Transl., 2015, vol. 45, no. 12, pp. 903–907.
Pavlovets, V.M., Okatyshi v tekhnologii ekstraktsii metallov iz rud (Pellets in the Technology of Metal Extraction from Ores), Novokuznetsk: Sib. Gos. Ind. Univ., 2014.
Pavlovets, V.M., Organization principals of forced nucleation in an empty zone of pelletizing disk, Izv. Vyssh. Uchebn. Zaved., Chern. Metall., 2009, no. 4, pp. 3–6.
Pavlovets, V.M., Research of heat-force regimes of wet charge spraying intended for forced nucleation, Izv. Vyssh. Uchebn. Zaved., Chern. Metall., 2009, no. 6, pp. 9–13.
Pavlovets, V.M., Study of the receiving process of wet pellets with the use of forced nucleation, Izv. Vyssh. Uchebn. Zaved., Chern. Metall., 2010, no. 6, pp. 15–20.
Abzalov, V.M., Gorbachev, V.A., Evstyugin, S.N., Klein, V.I., and Leont’ev, L.I., Fiziko-tekhnicheskie i teplotekhnicheskie osnovy proizvodstva zhelezorudnykh okatyshei (Physical-Technical and Heat Engineering Principles of Iron-Ore Pellet Production), Yekaterinburg: Toreks, 2012.
Yusfin, Yu.S., Pashkov, N.F., Antonenko, L.K., Zhak, R.M., Maizel’, G.M., and Bazilevich, T.N., Intensifikatsiya proizvodstva i uluchshenie kachestva okatyshei (Intensification of Production and the Improvement of Pellet Quality), Moscow: Metallurgiya, 1994.
Ruchkin, I.E., Proizvodstvo zhelezorudnykh okatyshei (Production of Iron-Ore Pellets), Moscow: Metallurgiya, 1976.
Maerchak, Sh., Proizvodstvo okatyshei (Production of Pellets), Moscow: Metallurgiya, 1982.
Boley, B.A. and Weiner, J.H., Theory of Thermal Stresses, New York: Wiley, 1960.
Mel’nikova, I.V., Spravochnik (kadastr) fizicheskikh svoistv gornykh porod (Handbook (Cadastre) of Physical Properties of Rock Minerals), Moscow: Nedra, 1975.
Lykov, A.V., Teoriya teploprovodnosti (Theory of Heat Conductivity), Moscow: Vysshaya Shkola, 1967.
Tuchinskii, L.I., Plastic relaxation of thermal stresses in nonisothermal conditions, Poroshk. Metall., 1982, no. 11, pp. 24–29.
Skorokhod, V.V., Plasticity conditions of porous bodies, Poroshk. Metall., 1978, no. 11, pp. 83–87.
Urusov, V.S., Energeticheskaya kristallokhimiya (Power Crystal Chemistry), Moscow: Nauka, 1975.
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © V.M. Pavlovets, A.V. Gerasimuk, 2016, published in Izvestiya Vysshikh Uchebnykh Zavedenii, Chernaya Metallurgiya, 2016, No. 8, pp. 536–542.
About this article
Cite this article
Pavlovets, V.M., Gerasimuk, A.V. Thermal stress in iron-ore pellets with differentiated porosity. Steel Transl. 46, 538–543 (2016). https://doi.org/10.3103/S0967091216080131
Received:
Published:
Issue Date:
DOI: https://doi.org/10.3103/S0967091216080131