Design for Carbon Core Pellet toward Co-production with Sinter

Iwase, Kazumi; Higuchi, Takahide; Yamamoto, Tetsuya; Murakami, Taichi

doi:10.2355/isijinternational.isijint-2021-590

Cited by 2 publications

(8 citation statements)

References 27 publications

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“…In addition, the Blaine's surface area of 2 200 cm 2 gave the green pellets enough strength to prevent deformation or collapse during mixing with the sinter mix, charging into the pot and forming the wet zone. Moreover, as previously reported 26) , in order to secure permeability at high…”

Section: Effect Of Co-firing On Productivitymentioning

confidence: 53%

“…Quicklime was used to adjust the basicity, CaO/SiO 2 , of the pellets. Following the previous study 26) , the quicklime was blended so that the basicity of the pellets was adjusted to 2.0. Coke breeze sized between 3 and 5 mm was used as the carbon core.…”

Section: Preparation Of Green Pellet and Sinter MIXmentioning

confidence: 99%

“…Table 2 also shows the blending ratio of the green pellets and sinter mix and other pot test parameters. Since most of the coke nuclei in the pellets remain without being fully combusted even after co-firing with the sinter mix in the packed bed as the previous study reported 26) , the carbon core was not regarded as a heat source. The solid fuel rate with respect to the total mass of the sinter mix and green pellet was set to 4.0 mass% regardless of the green pellet blending ratio.…”

Section: Co-firing Of Green Pellets and Sinter MIX In Pot Testmentioning

confidence: 99%

“…Moreover, it is also possible to produce a highly reducible sintered ore containing a carbonaceous material after sintering by this process. A previous report 26) discussed the design of a green pellet that demonstrated high strength and reducibility and retained the carbon core inside the pellet even after co-firing with the sinter mix in the packed bed. The methodology for continuous production of this type of two-layered green pellet with a carbon core by using a disk pelletizer was subsequently studied 27) .…”

Section: Introductionmentioning

confidence: 99%

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Co-firing of Green Pellets and Sinter Mix in Packed Bed

Iwase¹,

Kawamoto

Higuchi³

et al. 2023

ISIJ Int.

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With the aim of developing an iron ore sinter with a better reducibility, the authors researched the co-firing of green pellets and a sinter mix in a packed bed. First, a physical simulation with a simulator for the charging equipment of a sintering machine demonstrated that the green pellets were distributed more strongly to the lowest part of the packed bed because their size is larger than that of the sinter mix. Pot tests based on the simulated pellet distribution proved that it is possible to produce a highly reducible sinter at higher productivity, particularly when a concentrate with a large Blaine surface area is used to produce rigid green pellets. Factors that could reduce product yield were also pointed out, i.e., diffusion of the melt from the sinter mix into the pellets and a larger local heat supply to the sinter mix than is suitable. These factors are thought to hinder the formation of thick and strong bonds in the co-fired sinter bed. A 450 kV class X-ray CT was used to visualize the internal structure of the sinter plugs, and revealed the plug made with the green pellets has higher porosity, which is important for better permeability, but also results in less bond formation, which reduces the yield in a co-fired plug. These findings revealed insights for fully enjoying the advantages of co-firing green pellets and sinter mix, as well as issues to be overcome in order to realize a successful co-firing process.

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Section: Effect Of Co-firing On Productivitymentioning

confidence: 53%

Section: Preparation Of Green Pellet and Sinter MIXmentioning

confidence: 99%

Section: Co-firing Of Green Pellets and Sinter MIX In Pot Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Co-firing of Green Pellets and Sinter Mix in Packed Bed

Iwase¹,

Kawamoto

Higuchi³

et al. 2023

ISIJ Int.

Self Cite

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show abstract

“…They also confirmed the effect of improving reducibility and reducing pressure loss in softening and melting tests. Iwase et al 20) designed the structure and composition of a pellet with a carbon core suitable for firing in a sintering machine. However, a mass production method for granulating iron ore pellets with a carbon core has not been established.…”

Section: Introductionmentioning

confidence: 99%

Method of Making Iron Ore Pellets with a Carbon Core by Disc Pelletizer

Iwase¹,

Higuchi²,

Yamamoto³

2023

ISIJ Int.

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The pellet making method was studied for production of iron ore pellets with a carbon core. The pellets are to be fired in a sintering machine to produce sintered ores containing carbonaceous material. This new raw material for the blast furnace will have advantages such as high reducibility and low slag generation. In this study, pellet making tests were performed using laboratory and pilot scale disc pelletizers with 3 to 5 mm coke breeze, concentrated iron ores and additives in order to construct a method for producing pellets with a carbon core. Scaling-up of the method was considered with four discs with diameters of 0.6, 1.2, 2.0 and 3.5 m. As a result, it was found that there were two strategies for producing pellets with a carbon core at high yield: supplying a suitable level of water with a small droplet size, and spraying water in a specific area where the coke breeze flows on the surface of the contents in the disc. This study demonstrated that iron ore pellets with a carbon core can be obtained at a yield of more than 90% by using the disc pelletizer with the 3.5 m diameter. It was also estimated that a production capacity of 70 t/h can be expected with a 7.5 m diameter disc for commercial scale operation. This achievement of constructing a method for producing pellets with a carbon core was a breakthrough which overcame one of the technical hurdles for the development of sintered ores containing carbonaceous material. KEY WORDS: iron ore pellet; carbon core; pelletizing; high reducibility; low slag.

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Design for Carbon Core Pellet toward Co-production with Sinter

Cited by 2 publications

References 27 publications

Co-firing of Green Pellets and Sinter Mix in Packed Bed

Co-firing of Green Pellets and Sinter Mix in Packed Bed

Method of Making Iron Ore Pellets with a Carbon Core by Disc Pelletizer

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