Control of Hydration of Free Magnesia in Steelmaking Slag

Ryo Inoue; Madoka Uchidate; Shiori Kusukawa; Natsumi Kado; Yasushi Takasaki; Shigeru Ueda

doi:10.1007/s40831-021-00401-y

Control of Hydration of Free Magnesia in Steelmaking Slag

Ryo Inoue, Madoka Uchidate, Shiori Kusukawa, Natsumi Kado, Yasushi Takasaki, Shigeru Ueda

Center for Mineral Processing and Metallurgy (CMPM)

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

Abstract

Abstract: The expansion phenomenon, which is a major issue when using steelmaking slag as a roadbed material and civil engineering material, is caused by the volume expansion during hydration of free CaO (undissolved CaO and precipitated CaO) and free MgO (undissolved MgO and precipitated MgO) contained in steelmaking slag. From the weight change of MgO reagent hydrated in distilled water, it was clarified that hydration of undissolved MgO proceeded slowly. In addition, experiments of hydrating MgO–FeO solid solution using an autoclave revealed that with increasing FeO concentration in the solid solution, the hydration degree became lower. The FeO content solved in solid MgO at 1550–1650 °C was experimentally determined and expressed by the following equation:(mass%FeO)in MgO=-0.477(mass%CaO)/(mass%SiO2)+0.756(mass%T.Fe)+0.695(mass%MgO)+437000/T-224.3From these results, the conditions for the formation of free MgO phase that is not hydrated (or easily hydrated) were discussed. Graphical Abstract: [Figure not available: see fulltext.]

Original language	English
Pages (from-to)	818-830
Number of pages	13
Journal	Journal of Sustainable Metallurgy
Volume	7
Issue number	3
DOIs	https://doi.org/10.1007/s40831-021-00401-y
Publication status	Published - 2021 Sep

Keywords

Free MgO
Hydration
Magnesiowüstite
MgO–FeO solid solution
Precipitated MgO

ASJC Scopus subject areas

Environmental Science (miscellaneous)
Mechanics of Materials
Metals and Alloys

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10.1007/s40831-021-00401-y

Cite this

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title = "Control of Hydration of Free Magnesia in Steelmaking Slag",

abstract = "Abstract: The expansion phenomenon, which is a major issue when using steelmaking slag as a roadbed material and civil engineering material, is caused by the volume expansion during hydration of free CaO (undissolved CaO and precipitated CaO) and free MgO (undissolved MgO and precipitated MgO) contained in steelmaking slag. From the weight change of MgO reagent hydrated in distilled water, it was clarified that hydration of undissolved MgO proceeded slowly. In addition, experiments of hydrating MgO–FeO solid solution using an autoclave revealed that with increasing FeO concentration in the solid solution, the hydration degree became lower. The FeO content solved in solid MgO at 1550–1650 °C was experimentally determined and expressed by the following equation:(mass%FeO)in MgO=-0.477(mass%CaO)/(mass%SiO2)+0.756(mass%T.Fe)+0.695(mass%MgO)+437000/T-224.3From these results, the conditions for the formation of free MgO phase that is not hydrated (or easily hydrated) were discussed. Graphical Abstract: [Figure not available: see fulltext.]",

keywords = "Free MgO, Hydration, Magnesiow{\"u}stite, MgO–FeO solid solution, Precipitated MgO",

author = "Ryo Inoue and Madoka Uchidate and Shiori Kusukawa and Natsumi Kado and Yasushi Takasaki and Shigeru Ueda",

note = "Funding Information: This study was carried out with research grant from Steel Foundation for Environmental Protection Technology. Publisher Copyright: {\textcopyright} 2021, The Minerals, Metals & Materials Society.",

year = "2021",

month = sep,

doi = "10.1007/s40831-021-00401-y",

language = "English",

volume = "7",

pages = "818--830",

journal = "Journal of Sustainable Metallurgy",

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number = "3",

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TY - JOUR

T1 - Control of Hydration of Free Magnesia in Steelmaking Slag

AU - Inoue, Ryo

AU - Uchidate, Madoka

AU - Kusukawa, Shiori

AU - Kado, Natsumi

AU - Takasaki, Yasushi

AU - Ueda, Shigeru

N1 - Funding Information: This study was carried out with research grant from Steel Foundation for Environmental Protection Technology. Publisher Copyright: © 2021, The Minerals, Metals & Materials Society.

PY - 2021/9

Y1 - 2021/9

N2 - Abstract: The expansion phenomenon, which is a major issue when using steelmaking slag as a roadbed material and civil engineering material, is caused by the volume expansion during hydration of free CaO (undissolved CaO and precipitated CaO) and free MgO (undissolved MgO and precipitated MgO) contained in steelmaking slag. From the weight change of MgO reagent hydrated in distilled water, it was clarified that hydration of undissolved MgO proceeded slowly. In addition, experiments of hydrating MgO–FeO solid solution using an autoclave revealed that with increasing FeO concentration in the solid solution, the hydration degree became lower. The FeO content solved in solid MgO at 1550–1650 °C was experimentally determined and expressed by the following equation:(mass%FeO)in MgO=-0.477(mass%CaO)/(mass%SiO2)+0.756(mass%T.Fe)+0.695(mass%MgO)+437000/T-224.3From these results, the conditions for the formation of free MgO phase that is not hydrated (or easily hydrated) were discussed. Graphical Abstract: [Figure not available: see fulltext.]

AB - Abstract: The expansion phenomenon, which is a major issue when using steelmaking slag as a roadbed material and civil engineering material, is caused by the volume expansion during hydration of free CaO (undissolved CaO and precipitated CaO) and free MgO (undissolved MgO and precipitated MgO) contained in steelmaking slag. From the weight change of MgO reagent hydrated in distilled water, it was clarified that hydration of undissolved MgO proceeded slowly. In addition, experiments of hydrating MgO–FeO solid solution using an autoclave revealed that with increasing FeO concentration in the solid solution, the hydration degree became lower. The FeO content solved in solid MgO at 1550–1650 °C was experimentally determined and expressed by the following equation:(mass%FeO)in MgO=-0.477(mass%CaO)/(mass%SiO2)+0.756(mass%T.Fe)+0.695(mass%MgO)+437000/T-224.3From these results, the conditions for the formation of free MgO phase that is not hydrated (or easily hydrated) were discussed. Graphical Abstract: [Figure not available: see fulltext.]

KW - Free MgO

KW - Hydration

KW - Magnesiowüstite

KW - MgO–FeO solid solution

KW - Precipitated MgO

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Control of Hydration of Free Magnesia in Steelmaking Slag

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