The structure of sintered ore of various basicity
DOI:
https://doi.org/10.31498/2225-6733.28.2014.33466Keywords:
sinter, basicity, recoverability, microstructure, strengthAbstract
In this article the selection of the optimum for recoverability and the strength of the agglomerates in order to achieve maximum efficiency of sintering and blast furnace production. Analyzed the microstructure and properties of agglomerates basicity 0,98-8,00 obtained under laboratory conditions. Data were confirmed by the fall of cold strength of sinter regardless of the charge composition and sintering conditions in the range of basicity of 1.15 - 1.50. The main reasons for the strength reduction - a complex mineralogical composition of the agglomerate, insufficient interaction of the components of the charge and the high content of dicalcium silicate Ca2SiO4. Most of the sinter plants produce sinter basicity in this interval. One solution to the problem is the production of two different base agglomerates that do not fall within the range of minimum durability. Worst performing sintering have agglomerates basicity B = 1.47. Best strength characteristics have interparticle basicity 2.0-3.0. Resilience remains quite high - 54-67%, although it has a significant downward trend. Recoverability of the maximum reached was 69.3% at 2.32 basicity. Replacing limestone lime positive impact on productivity and pelletization charge sintering process. It should also be noted some improvement in the sintered agglomerate relative to the base with a decrease in basicity to 0.98. Fayalite formed in significant quantities at a low basicity and normal agglomerates increases the strength of the agglomerate while lowering recoverability. Dicalcium silicate is formed in the low basicity the agglomerates at 675 ° C passes from β-phase to the γ-phase with increasing volume by 12% causing degradation agglomerate. In the structure of the agglomerates basicity 2.0-2.5 predominate magnetite, ferrite, calcium silicate and calcium glass is practically absent. These agglomerates have a recoverable 62,5-69,3% and strength 76,1-87,7%. Given the high strength, good recoverability and performance are recommended for the production of agglomerates basicity 2.0-2.5
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