Abstract
The paper presents the calculation methods of burnt zonal fl uxed pellets at the basis of rising strained state at their cooling on the border of zones with diff erent temperature of crystallizalization of slag content. The calculations of strained state for Kachkanar pellets with diff erent disposition of hematite and magnetite zones were carried out. It was shown that cooling of the burnt zonal pellets in the air at the border of magnetite core and hematite shell–stretching radial tenses appear and they contribute to the loss of contact between the core and the shell. It was determined that the presence of the three-zonal structure of pellets (core–hematite shell–magnetite fi lm surface) contributes to re-distribution of normal tenses at their section. The increase of thickness of magnetite fi lm surface decreases stretching tenses in radial direction at the border of the core and the shell, in the result of which the strength of pellets rises. At cooling of burnt pellets with hematite core and magnetite shell in the neutral atmosphere at the border of zones stretching normal tenses appear in tangential direction, they contribute to the reduction of strength of pellets.
Highlights
It was shown that cooling of the burnt zonal pellets in the air at the border of magnetite core and hematite shell–stretching radial tenses appear and they contribute to the loss of contact between the core and the shell
It was determined that the presence of the three-zonal structure of pellets contributes to re-distribution of normal tenses at their section
At cooling of burnt pellets with hematite core and magnetite shell in the neutral atmosphere at the border of zones stretching normal tenses appear in tangential direction, they contribute to the reduction of strength of pellets
Summary
Предложена методика расчета напряжений в обожженных зональных офлюсованных окатышах на основе возникновения при их охлаждении напряженного состояния на границе зон с разной температурой кристаллизации шлаковых включений. Что при охлаждении обожженных зональных окатышей на воздухе на границе магнетитового ядра и гематитовой оболочки возникают растягивающие нормальные напряжения в радиальном направлении, способствующие отрыву ядра от оболочки. При охлаждении обожженных окатышей с гематитовым ядром и магнетитовой оболочкой в нейтральной атмосфере на границе зон возникают растягивающие нормальные напряжения в тангенциальном направлении, способствующие снижению прочности окатышей.
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