Effect of Microwave Irradiation on Hydrothermal Treatment of Blast Furnace Slag

Tae, Soon-Jae; Tanaka, Toshihiro; Morita, Kazuki

doi:https://doi.org/10.2355/isijinternational.49.1259

アクセス数:157件（2024-04-17 02:41 集計）

固定URL: https://hdl.handle.net/11094/26380

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タイトル	Effect of Microwave Irradiation on Hydrothermal Treatment of Blast Furnace Slag
著者	著者名 Tae, Soon-Jae
	NRID 1000010179773 1000010179773 researchmap permalink read0013978 read0013978 著者名 Tanaka, Toshihiro
	NRID 1000000210170 1000000210170 著者名 Morita, Kazuki
キーワード等	blast furnace slag
	hydrothermal treatment
	hydrothermal hot-pressing
	microwave irradiation
	microwave-hydrothermal treatment
	recycling
抄録	The effect of microwave irradiation on the hydrothermal treatment of blast furnace (BF) slag was investigated using a 2.45 GHz microwave irradiation system. The comparison of the features of a microwave-hydrothermal (M-H) reaction with those of a conventional hydrothermal (C-H) reaction showed that in both these reactions, tobermorite (Ca_5Si_6O_<16>(OH)_2·4H_2O) was formed as the major phase in the treated samples. When the BF slag was hydrothermally treated by the C-H reaction, tobermorite was formed in the vapor state as the major phase at 200°C after a holding time of 48 h; in the M-H reaction, tobermorite was rapidly formed within 3 h at the same temperature. It was elucidated that microwave irradiation promoted the hydrothermal reaction to a significant extent. Furthermore, effects of microwave irradiation on BF slag subjected to hydrothermal hot-pressing were investigated. After microwave irradiation, the compressive strength of the slag compact and rate of porosity in the compact after treatment increased and decreased, respectively, in comparison with those before treatment. Moreover, microwave irradiation was advantageous over conventional heating at the same temperature in that it enhanced the compressive strength of the BF slag.
出版者	日本鉄鋼協会
	The Iron and Steel Institute of Japan
	ニホン　テッコウ　キョウカイ
収録物名	ISIJ International
巻(号)	49(8)
ページ	1259-1264
刊行年月	2009
言語	英語
ハンドルURL	https://hdl.handle.net/11094/26380
PISSN	09151559
NCID	AA10680712
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.2355/isijinternational.49.1259
アクセス権	open access
権利情報	© 2009 ISIJ
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	ISIJ International. 2009, 49(8), p. 1259-1264
DC.title	Effect of Microwave Irradiation on Hydrothermal Treatment of Blast Furnace Slag
DC.creator	Tae, Soon-Jae
	Tanaka, Toshihiro
	Morita, Kazuki
DC.publisher	日本鉄鋼協会
	The Iron and Steel Institute of Japan
	ニホン　テッコウ　キョウカイ
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2009
DC.identifier	https://doi.org/10.2355/isijinternational.49.1259
DC.subject	blast furnace slag
	hydrothermal treatment
	hydrothermal hot-pressing
	microwave irradiation
	microwave-hydrothermal treatment
	recycling
DCTERMS.abstract	The effect of microwave irradiation on the hydrothermal treatment of blast furnace (BF) slag was investigated using a 2.45 GHz microwave irradiation system. The comparison of the features of a microwave-hydrothermal (M-H) reaction with those of a conventional hydrothermal (C-H) reaction showed that in both these reactions, tobermorite (Ca_5Si_6O_<16>(OH)_2·4H_2O) was formed as the major phase in the treated samples. When the BF slag was hydrothermally treated by the C-H reaction, tobermorite was formed in the vapor state as the major phase at 200°C after a holding time of 48 h; in the M-H reaction, tobermorite was rapidly formed within 3 h at the same temperature. It was elucidated that microwave irradiation promoted the hydrothermal reaction to a significant extent. Furthermore, effects of microwave irradiation on BF slag subjected to hydrothermal hot-pressing were investigated. After microwave irradiation, the compressive strength of the slag compact and rate of porosity in the compact after treatment increased and decreased, respectively, in comparison with those before treatment. Moreover, microwave irradiation was advantageous over conventional heating at the same temperature in that it enhanced the compressive strength of the BF slag.
DC.rights	© 2009 ISIJ
DC.format	application/pdf
citation_title	Effect of Microwave Irradiation on Hydrothermal Treatment of Blast Furnace Slag
citation_author	Tae, Soon-Jae
	Tanaka, Toshihiro
	Morita, Kazuki
citation_publisher	日本鉄鋼協会
	The Iron and Steel Institute of Japan
	ニホン　テッコウ　キョウカイ
citation_language	英語
citation_date	2009
citation_journal_title	ISIJ International
citation_volume	49
citation_issue	8
citation_firstpage	1259
citation_lastpage	1264
citation_doi	https://doi.org/10.2355/isijinternational.49.1259
citation_public_url	https://hdl.handle.net/11094/26380

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