| Title |
Effect of Al2O3 Content and Particle Size of Iron Ore on the Assimilation Characteristics of Sintered Ore |
| Authors |
서준기(Jun Gi Seo); 송재민(Jae Min Song); 이도연(Do Yeon Lee); 박태준(Tae Jun Park); 권한중(Han Jung Kwon) |
| DOI |
https://doi.org/10.3365/KJMM.2024.62.9.696 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Iron Ore; Assimilation; Penetration Depth; Sintered Ore; Reactivity Index |
| Abstract |
This study aims to comprehensively understand the effects of changes in the chemical composition and size of attached particles on the resulting assimilation characteristics during the sintered ore production process. By evaluating the penetration depth and changes in the chemical composition in the assimilated region of the iron ore and calcium ferrite, the Iron ore Reactivity Index (IRI) was derived using the melt penetration depth of the tablet-type calcium ferrite and iron ore. When the iron ore particle size was 1-0.5 mm, the IRI was 2.23, and ~45% of the iron ore tablets reacted with the calcium ferrite. When the particle size was 0.15 mm or less, the IRI was 0.46, indicating little assimilation with calcium ferrite. This phenomenon was directly related to Al2O3; the iron ore composed of large particles had a low alumina content, making its assimilation with calcium ferrite easier, while iron ore composed of small particles had a high alumina content, making its assimilation with calcium ferrite difficult. When ores of various particle sizes were blended to obtain an equal average particle size, the penetrated area between the ore and calcium ferrite was smaller in samples with a relatively large proportion of small particles. The larger the proportion of fine particle with high alumina contents, the smaller the assimilation area, indicating that the alumina content was the main factor influencing the ore- calcium ferrite reaction. This study shows that the chemical composition is the most important factor in iron ore sintering, and the assimilation behavior of iron ore and calcium ferrite can be controlled by blending iron ores of different sizes. |