چكيده به لاتين
In this study, the substitution of starch binder instead of bentonite adhesive for making iron oxide pellets was investigated. The use of bentonite binder with silica is not recommended to make pellets. Because it increases the acidity of the slag and the energy consumption of the arc furnace. A disk pelletizer has been used to make pellets. The pellets were dried at 250 °C, then the preheating step was performed at 320 to 1000 °C and in the end the samples were sintered at 1300 °C for 20 minutes. The strength of pellets was measured in wet and sintered state, and also the porosity of the samples was measured using Archimedes method and compared with each other. The amount of added water to produce pellets was between 8 and 9% by weight. The highest drop numbers obtained for pellets produced with bentonite and starch binders were 7 and 7.8, respectively. The compressive strength of pellets produced with 2 and 2.5% by weight of bentonite binder was equal to 2600 N / pellet, and the porosity of these samples was 21 and 20.6%, respectively. While the maximum compressve strength for pellets produced with starch adhesive was 2050 N/pellet. Finally, using 0.5 and 0.25% by weight of a mixture of bentonite and starch binders, pellets were produced with a compressive strength of 2240 N/pellet and a porosity of 23.5%.
