Sintering Technology Using Parallel Granulation Process at High                        Pellet Feed Ratio

Sinter plant is becoming ''a waste eater'' that actively recycle the raw materials generated in the steelworks. Especially, the recycling demand of slags in steelmaking processes has been increasing. These slags, which contains substances with a high melting point, is well known to reduces the fluidity of the melt. We recognized that mixture of two types of granulates, a donor of melt (High CaO/Fe 2 O 3 ) and a receptor of melt (Low CaO/Fe 2 O 3 ), formed a homogeneous sinter cake when using parallel granulation process. By adjusting the adhesive layer components of two types of granulates, the melt from donor moves to receptor and assimilation can be promoted. So, we have developed the granulation method with inclined mixing of limestone that has improved both productivity and sinter strength even when using steelmaking slag. The promotion of melt assimilation state has been proved by using SEM with mineral phase analysis function and X-ray CT.

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石灰傾斜配合造粒の溶融同化挙動に及ぼす影響

Osuga

Adachi

Yamazaki

et al. 2023

Tetsu-to-Hagane

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Strengthening Granulating and Sintering Performance of Refractory Iron Concentrate by Pre-Pelletizing

Han

Yang

Wei

et al. 2023

Metals

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May Concentrate Iron ore, as a refractory iron concentrate, deteriorates the permeability of the sintered layer during the sintering process due to its fine particle size and poor granulating performance. Therefore, it cannot be widely used in iron ore sintering. In this study, the strengthening granulation of May Concentrate Iron ore using pre-pelletizing to expand its utilization ratio was proposed. The experiments of conventional granulation, pre-pelletizing granulation and sinter pot test were carried out. Increasing May Concentrate Iron ore (a refractory iron concentrate) proportion was detrimental to conventional granulation, reducing the quasi-particle particle size and strength. May Concentrate Iron granulating and sintering performances were improved by pre-pelletizing. The quasi-particle average size at 36% May Concentrate Iron proportion jumped to 4.92 mm of pre-pelletizing granulation from 3.22 mm of conventional granulation. Meanwhile, the permeability index rose to 0.33 from 0.11, while the falling and drying pulverization ratio fell to 7.05% and 6.11% from 22.59% and 15.88%, respectively. The consolidation mode of matrix materials was liquid phase consolidation, while that of May Concentrate Iron pellets was solid phase consolidation, forming the structure of the pellets embedded in the matrix materials. Furthermore, the partial alkalinity of the matrix materials was increased because of the separation of May Concentrate Iron, generating a large amount of acicular calcium ferrite with better consolidation strength than conventional granulation sintering.

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Sintering Technology Using Parallel Granulation Process at High Pellet Feed Ratio

Cited by 2 publications

References 10 publications

石灰傾斜配合造粒の溶融同化挙動に及ぼす影響

石灰傾斜配合造粒の溶融同化挙動に及ぼす影響

Strengthening Granulating and Sintering Performance of Refractory Iron Concentrate by Pre-Pelletizing

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