Calorimetric study on hydration of CaO-based oxides

Y. Iguchi; T. Narushima; C. Izumi

doi:10.1016/S0925-8388(01)00970-7

Calorimetric study on hydration of CaO-based oxides

Y. Iguchi, T. Narushima, C. Izumi

ENG - Materials Processing

Tohoku University

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

Hydration behavior of compounds in Ca-(Si, Al or Fe)-O systems, CaO-(FeO or MnO) solid solutions and various kind of slags were investigated using calorimetric and dilatometric techniques in order to clarify the effects of CaO-based oxides on stability of steelmaking slag. Slow hydration rate and large volume expansion were observed in 3CaO·Al₂O₃, which was a harmful component for stabilizing slag. Heat of hydration and volume expansion of CaO solid solutions were almost the same as those of pure CaO in lower solute content region than 30-mole%, while the hydration rate decreased as MnO contents increased in higher solute content region. Hydration behavior of converter slag was dominated by free lime contained in the slag. It was suggested that 3CaO·Al₂O₃ affected hydration behavior of ladle furnace free (LF) slag because Al dissolution was detected after calorimetric measurements and slow expansion rates and higher heat of hydration than that calculated with free lime contents were observed for LF slag.

Original language	English
Pages (from-to)	276-281
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	321
Issue number	2
DOIs	https://doi.org/10.1016/S0925-8388(01)00970-7
Publication status	Published - 2001 Jun 14

Keywords

Calorimetry
Heat of hydration
Slags

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10.1016/S0925-8388(01)00970-7

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title = "Calorimetric study on hydration of CaO-based oxides",

abstract = "Hydration behavior of compounds in Ca-(Si, Al or Fe)-O systems, CaO-(FeO or MnO) solid solutions and various kind of slags were investigated using calorimetric and dilatometric techniques in order to clarify the effects of CaO-based oxides on stability of steelmaking slag. Slow hydration rate and large volume expansion were observed in 3CaO·Al2O3, which was a harmful component for stabilizing slag. Heat of hydration and volume expansion of CaO solid solutions were almost the same as those of pure CaO in lower solute content region than 30-mole%, while the hydration rate decreased as MnO contents increased in higher solute content region. Hydration behavior of converter slag was dominated by free lime contained in the slag. It was suggested that 3CaO·Al2O3 affected hydration behavior of ladle furnace free (LF) slag because Al dissolution was detected after calorimetric measurements and slow expansion rates and higher heat of hydration than that calculated with free lime contents were observed for LF slag.",

keywords = "Calorimetry, Heat of hydration, Slags",

author = "Y. Iguchi and T. Narushima and C. Izumi",

note = "Funding Information: The authors would like to express their gratitude to Mr M. Sakuma (graduate student at Tohoku University), who was formerly undergraduate student at Tohoku University for his assistance in the experiments. Thanks are also due to Mr H. Tobo (Kawasaki Steel Co., Chiba) for his expansion experiments for slags and CaO-based oxides. This work was partly supported by ISIJ Research Promotion Grant. ",

year = "2001",

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doi = "10.1016/S0925-8388(01)00970-7",

language = "English",

volume = "321",

pages = "276--281",

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T1 - Calorimetric study on hydration of CaO-based oxides

AU - Iguchi, Y.

AU - Narushima, T.

AU - Izumi, C.

N1 - Funding Information: The authors would like to express their gratitude to Mr M. Sakuma (graduate student at Tohoku University), who was formerly undergraduate student at Tohoku University for his assistance in the experiments. Thanks are also due to Mr H. Tobo (Kawasaki Steel Co., Chiba) for his expansion experiments for slags and CaO-based oxides. This work was partly supported by ISIJ Research Promotion Grant.

PY - 2001/6/14

Y1 - 2001/6/14

N2 - Hydration behavior of compounds in Ca-(Si, Al or Fe)-O systems, CaO-(FeO or MnO) solid solutions and various kind of slags were investigated using calorimetric and dilatometric techniques in order to clarify the effects of CaO-based oxides on stability of steelmaking slag. Slow hydration rate and large volume expansion were observed in 3CaO·Al2O3, which was a harmful component for stabilizing slag. Heat of hydration and volume expansion of CaO solid solutions were almost the same as those of pure CaO in lower solute content region than 30-mole%, while the hydration rate decreased as MnO contents increased in higher solute content region. Hydration behavior of converter slag was dominated by free lime contained in the slag. It was suggested that 3CaO·Al2O3 affected hydration behavior of ladle furnace free (LF) slag because Al dissolution was detected after calorimetric measurements and slow expansion rates and higher heat of hydration than that calculated with free lime contents were observed for LF slag.

AB - Hydration behavior of compounds in Ca-(Si, Al or Fe)-O systems, CaO-(FeO or MnO) solid solutions and various kind of slags were investigated using calorimetric and dilatometric techniques in order to clarify the effects of CaO-based oxides on stability of steelmaking slag. Slow hydration rate and large volume expansion were observed in 3CaO·Al2O3, which was a harmful component for stabilizing slag. Heat of hydration and volume expansion of CaO solid solutions were almost the same as those of pure CaO in lower solute content region than 30-mole%, while the hydration rate decreased as MnO contents increased in higher solute content region. Hydration behavior of converter slag was dominated by free lime contained in the slag. It was suggested that 3CaO·Al2O3 affected hydration behavior of ladle furnace free (LF) slag because Al dissolution was detected after calorimetric measurements and slow expansion rates and higher heat of hydration than that calculated with free lime contents were observed for LF slag.

KW - Calorimetry

KW - Heat of hydration

KW - Slags

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Calorimetric study on hydration of CaO-based oxides

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Keywords

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