Development of Continuous Rapid Curing Process for Cold Pellet and Evaluation of Physical Properties of Products

Miyashita, Tsuneo; Yoshikoshi, Hideyuki; Matsui, Seiji; Tajima, O.; Fukuyo, Hiroshi

doi:10.2355/tetsutohagane1955.69.16_1974

“…An example of the commercialization of a material for an electric furnace for silico-manganese production is only reported. 20,21) This study provides results of the rapid curing tests in RCA production involving small-scale batch tests, continuous rapid curing tests and plant steam curing tests.…”

Section: )mentioning

confidence: 99%

Development of Rapid Curing Process of Reactive Coke Agglomerate

Higuchi

¹

,

Yokoyama

²

,

Satō

³

et al. 2017

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We commercialized Reactive Coke Agglomerate (RCA), a cement-bonded pellet to decrease the thermal reserve zone temperature for the reduction of the reducing agent rate of blast furnaces. To achieve a high productivity of supplying RCA to large blast furnaces, a rapid curing process of RCA using steam was investigated. We obtained rapid curing of RCA within 18 h by combining primary curing for 12 h and stream curing at 80°C for 5 h subsequently with drying for 1 h. This combination provided sufficient strength to an RCA product when compared with the strength obtained after conventional yard curing, which requires a long curing time of 14 days. Plant trials revealed that a longer primary curing time was required because of the non-homogeneity of thermal conditions. Nevertheless, the curing period could be shortened by 12.5 days with drying and 9 days without drying. Mineralogy and morphology of hardened cement in RCA after rapid curing were investigated. XRD and thermal analysis revealed that the basic mineral composition of cement after rapid curing was comparable with that after conventional yard curing. In plant tests, during rapid curing, hydration and microstructural evolution of cement in RCA were accelerated by steam curing. RCA involving the steam curing process has been implemented in Oita works and it has been helping in a stable operation of two large blast furnaces under a low RAR.

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A review of binders in iron ore pelletization

Eisele

¹

,

Kawatra

²

2003

Mineral Processing and Extractive Metallurgy Review

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Development of Rapid Curing Process of Reactive Coke Agglomerate

Higuchi

¹

,

Yokoyama

²

,

Satō

³

et al. 2017

Tetsu-to-Hagane

3

0

View full text Add to dashboard Cite

We commercialized Reactive Coke Agglomerate (RCA), a cement-bonded pellet to decrease the thermal reserve zone temperature for the reduction of the reducing agent rate of blast furnaces. To achieve a high productivity of supplying RCA to large blast furnaces, a rapid curing process of RCA using steam was investigated. We obtained rapid curing of RCA within 18 h by combining primary curing for 12 h and stream curing at 80°C for 5 h subsequently with drying for 1 h. This combination provided sufficient strength to an RCA product when compared with the strength obtained after conventional yard curing, which requires a long curing time of 14 days. Plant trials revealed that a longer primary curing time was required because of the non-homogeneity of thermal conditions. Nevertheless, the curing period could be shortened by 12.5 days with drying and 9 days without drying. Mineralogy and morphology of hardened cement in RCA after rapid curing were investigated. XRD and thermal analysis revealed that the basic mineral composition of cement after rapid curing was comparable with that after conventional yard curing. In plant tests, during rapid curing, hydration and microstructural evolution of cement in RCA were accelerated by steam curing. RCA involving the steam curing process has been implemented in Oita works and it has been helping in a stable operation of two large blast furnaces under a low RAR.

show abstract

Development of Continuous Rapid Curing Process for Cold Pellet and Evaluation of Physical Properties of Products

Cited by 3 publications

References 0 publications

Development of Rapid Curing Process of Reactive Coke Agglomerate

Development of Rapid Curing Process of Reactive Coke Agglomerate

A review of binders in iron ore pelletization

Development of Rapid Curing Process of Reactive Coke Agglomerate

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