Abstract
A method is proposed for calculating the stress in roasted zonal fluxed pellets. The method is based on the appearance of a stress state at the boundary zones with different solidification temperatures of the slag inclusions on cooling. The stress state is calculated for Kachkanar pellets with different positions of the hematite and magnetite zones. It is shown that, on cooling annealed zonal pellets in air, tensile normal stress appears in the radial direction at the boundary of the magnetite core and the hematite shell. The presence of a three-zone structure in the pellets (magnetite core + hematite shell + surface magnetite film) facilitates the redistribution of normal stress over the cross section. Increasing the thickness of the surface magnetite film reduces the tensile stress in the radial direction at the boundary of the core and the shell. As a result, the pellet strength is increased. On cooling roasted pellets with a hematite core and a magnetic shell in a neutral atmosphere, tensile normal stress appears in the tangential direction, tending to reduce the pellet strength.
Published Version
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