Contribution Oral Presentation
Application of biomass fuel in iron ore sintering
In metallurgy, it is essential to obtain and use high quality fuel and reducing agents with low environmental impact. The use of biomaterials as a fuel might help to solve technological and environmental issues of sinter production. Biomass has enormous renewable carbon potential and CO2 neutrality. The main advantages of biomass are the low mineral composition and almost complete absence of sulphur, and the disadvantages are low bulk density, high moisture and volatile matter yield, high oxygen content, alkaline earth metals and relatively low carbon content. The biomass disadvantages as a fuel can be effectively eliminated through its use in compressed form. This will increase the bulk density of the material, give it the necessary size and mechanical strength. An even greater effect of improving the biomass properties as fuel is achieved after its preliminary carbonization. As a result of biomass pyrolysis, the amount of carbon increases, the content of oxygen and nitrogen decreases.
In this study, we investigate the use of some raw and pyrolysis-processed biomass pellet types, for iron ore sintering. As a alternative fuels used commercial pellets of sunflower husk (SFH), conifer wood, wheat straw, and walnut shell. The pyrolysis temperature was set to 673, 873, 1073, and 1273 K, and the proportion of biomass in the fuel composition was set to 25%
For all the test runs of sintering, the composition of the blend was the same, the changes were made only for the biofuel type. It was established that the addition of biofuels to the sintering blend leads to the increase in the gas permeability of the sintered layer. The analysis of the complex characteristics of the sintering process and the resultant sinter showed that the use of wood and SFH pellets leads to the production of sinter with sufficient strength characteristics. Good sintering process and product results were achieved when the sintering blend had a 25% composition of wood or SFH pellets pyrolyzed at 1073 and 873 K, respectively.