Effect of Ferro-Coke and Iron Ores Mixing Charging on Primary Slag Formation in Blast Furnace
2014; Taylor & Francis; Linguagem: Inglês
ISSN
1743-2812
Autores Tópico(s)Metal Extraction and Bioleaching
ResumoThe profile and position of the cohesive zone is one of the key factors affecting the blast furnace stable operation. The effect of ferro-coke mixing into the burden materials on primary slag formation process in the blast furnace was experimentally studied. Seven kinds of iron-bearing burden were studied. The results demonstrated that the addition of ferro-coke can lower the compression starting temperature of all samples. This is because ferro-coke starts to react with CO2 at lower temperatures and increases the difference between the CO concentration in gas and the equilibrium content, accelerating the indirect reduction of iron ore. Moreover, the addition of ferro-coke would generally increase the softening-end temperature and decrease the melt-down temperature, leading to smaller softening-melting temperature range by a large margin. This suggests the mixing of ferro-coke into iron ores can remarkably improve the permeability of blast furnace stock. The addition of ferro-coke increased significantly the carbon content in dropped liquid iron. Giving priority to the effect on the stock permeability, it was suggested to use the ferro-coke prepared with 20% iron ore A.
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