Influence of matrix strength and pore structure on sinter cake strength

Theoretical and experimental studies were carried out to understand the effects of matrix strength and pore structure on the tensile strength of the sinter cake. The matrix strength was described in terms of mass percentage of calcium-ferrite and amorphous silicate. The influence of pore structure on the tensile strength of the sinter cake was determined by the porosity and the pore size distribution. The calculated tensile strength by this model was in good agreement with the observed one. As a results of the theoretical studies and the survey of the sinter cake in the sinter plant, it follows that the contribution of the pore size distribution on the sinter yield is about 60%. It is effective to control the pore size distribution, in other words, to decrease the pores above 1.0mm for the improvement of the sinter yield at the top of the sintering bed.