Effect of Microwave Irradiation on Hydrothermal Treatment of Blast Furnace Slag

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

ISIJ International, 2009, 49(8), 1259-1264

Number of Access:283（2025-09-03 08:29 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/26380

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Title
Effect of Microwave Irradiation on Hydrothermal Treatment of Blast Furnace Slag
Creator
CreatorName
Tae, Soon-Jae
NRID
1000010179773 1000010179773
researchmap permalink
read0013978 read0013978
CreatorName
Tanaka, Toshihiro
NRID
1000000210170 1000000210170
CreatorName
Morita, Kazuki
Subject
blast furnace slag
hydrothermal treatment
hydrothermal hot-pressing
microwave irradiation
microwave-hydrothermal treatment
recycling
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.
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
Source Title
ISIJ International
Volume (Issue)
49(8)
Page
1259-1264
Date of Issued
2009
Language
English
Handle URL
https://hdl.handle.net/11094/26380
PISSN
09151559
NCID
AA10680712
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.2355/isijinternational.49.1259
Access Rights
open access
CopyRight
© 2009 ISIJ
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article