Flame front propagation and sinter strength properties of permeable sintering bed prepared via enhanced granulation with hydrated lime

Abstract

This paper is focused on investigating the influences of enhanced granulation with hydrated lime on the propagation of flame front and strength properties of the produced sinter in iron ore sintering. Pilot‐scale sinter pot experiments were performed at three hydrated lime levels, and the porous structures of sinter were reconstructed by high resolution X‐ray tomography. When hydrated lime increased from 0% to 2%, more permeable green bed with enlarged granule mean size and narrowed granule size distribution could be obtained, and sinter productivity increased from 37.3 to 40.7 t/m2/d while tumbler index of sinter decreased from 62.7% to 55.0%. Both the bed temperature and pressure profiles verified that hydrated lime addition fasten sintering by reduction of heat accumulation and acceleration of flame front speed in sintering bed. The three‐dimensional stress analysis based on the actual microstructures showed that more irregular sinter particles with higher porosity are obtained with higher hydrated lime due to the insufficient melt formation and coalescence during sintering. Sinter with 2% hydrated lime was much more compliant under the fixed compression, exhibiting larger potential to be deformed in locations including bridges with the small cross sections and notches with the small fillet radius.

Development of Cycloid-Shaped Roll Charging Chute for Sintering Process for Energy Decarbonization and Productivity Improvement in Steel Plants

“…Fan et al conducted simulations using artificial gas to analyze the influence of oxygen (O 2 ) content in circulating flue gas on the sinter bed [24]. Zhou and Zhou investigated the impact of granulation using hydrated lime on the sintering process and strength [25].…”

Effects of Adding Iron Ores-based Calcium Ferrites to the Sinter Mix on Sinter Quality and Reduction of CO₂, NO and SO₂

“…The defined time was set based on the previous studies that reported that the duration that the sample is exposed to the maximum temperature is very short. 36,41,42) Figure 4 represents the conditions implemented for the sintering experiment. After the samples were cooled, one sample was supplied for XRD analysis to identify the major phases present in the standard sinter, and the other sample was analyzed in terms of wet chemical analysis to evaluate the amount of total Fe, metallic Fe and Fe 2 + .…”

Numerical Investigation of the Defects Effect in Additive Manufactured Ti-6Al-4V Struts on Deformation Behavior Based on Microtomographic Images

“…Two main approaches can be distinguished, one of which is based on attempts to generate an imperfect shape of material structures from the data of the structure [ 9 , 10 , 11 , 12 ]. The second approach is to reproduce the shape as realistically as possible based on a material specimen [ 13 , 14 , 15 , 16 ]. In the case of the method based on realistic mapping, computer microtomography (micro-CT) is most frequently used [ 17 , 18 ].…”