Long-term Alkali Elution Behavior from Steelmaking Slag into Seawater by an Open Channel Vessel

Yamato Matsuda, Ryo Tanaka, Takahiro Okuno, Azhar Uddin, Yoshiei Katou, Katsunori Takahashi, Eiji Kiso

Research output: Contribution to journalArticle

Abstract

Steelmaking slag has been used in the coastal area for the purpose of the environmental improvement. Short-term alkali elution behavior induced by free CaO in the steelmaking slag was investigated by a batch and continuous vessel. In this study, long-term alkali elution experiments were done in an open channel vessel with a slag box to make clear the decreasing mechanism of the alkali elution from steelmaking slag into seawater. The experimental period was 44 d (1056 h). The pH values increased just in the beginning of the experiment, and then gradually decreased in about 100 min. They showed almost the same value as that of seawater in 1200 min. As the experimental time passed, the white deposits on the steelmaking slag layer, which were composed of Mg[OH] 2 and CaCO 3 , spread to the lower slag zone in the slag box. The white deposit zone of larger slag size was more rapidly diffused downward than that of smaller one due to larger voidage in the slag layer. While carrying out the batch test with the used slag by the long-term experiment, the alkali elution rate of slag layer on the open channel flow was 0.03-0.11 times decreased compared with the unused slag, whereas that of the lower positioned slag layer was 0.10-0.38 times decreased. From these results, it was found that the alkali elution rate was reduced by the white deposit on the steelmaking slag.

Original languageEnglish
Pages (from-to)61-68
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume105
Issue number4
DOIs
Publication statusPublished - Apr 1 2019

Fingerprint

elution
slags
Steelmaking
Alkalies
Seawater
Slags
vessels
alkalies
Deposits
deposits
boxes
open channel flow
Open channel flow
Experiments

Keywords

  • Long-term alkali elution
  • Open channel vessel
  • Sea water
  • Steelmaking slag

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

Cite this

Long-term Alkali Elution Behavior from Steelmaking Slag into Seawater by an Open Channel Vessel. / Matsuda, Yamato; Tanaka, Ryo; Okuno, Takahiro; Uddin, Azhar; Katou, Yoshiei; Takahashi, Katsunori; Kiso, Eiji.

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 105, No. 4, 01.04.2019, p. 61-68.

Research output: Contribution to journalArticle

Matsuda, Yamato ; Tanaka, Ryo ; Okuno, Takahiro ; Uddin, Azhar ; Katou, Yoshiei ; Takahashi, Katsunori ; Kiso, Eiji. / Long-term Alkali Elution Behavior from Steelmaking Slag into Seawater by an Open Channel Vessel. In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan. 2019 ; Vol. 105, No. 4. pp. 61-68.
@article{53f230f5ce6f4512a064c998491f5e40,
title = "Long-term Alkali Elution Behavior from Steelmaking Slag into Seawater by an Open Channel Vessel",
abstract = "Steelmaking slag has been used in the coastal area for the purpose of the environmental improvement. Short-term alkali elution behavior induced by free CaO in the steelmaking slag was investigated by a batch and continuous vessel. In this study, long-term alkali elution experiments were done in an open channel vessel with a slag box to make clear the decreasing mechanism of the alkali elution from steelmaking slag into seawater. The experimental period was 44 d (1056 h). The pH values increased just in the beginning of the experiment, and then gradually decreased in about 100 min. They showed almost the same value as that of seawater in 1200 min. As the experimental time passed, the white deposits on the steelmaking slag layer, which were composed of Mg[OH] 2 and CaCO 3 , spread to the lower slag zone in the slag box. The white deposit zone of larger slag size was more rapidly diffused downward than that of smaller one due to larger voidage in the slag layer. While carrying out the batch test with the used slag by the long-term experiment, the alkali elution rate of slag layer on the open channel flow was 0.03-0.11 times decreased compared with the unused slag, whereas that of the lower positioned slag layer was 0.10-0.38 times decreased. From these results, it was found that the alkali elution rate was reduced by the white deposit on the steelmaking slag.",
keywords = "Long-term alkali elution, Open channel vessel, Sea water, Steelmaking slag",
author = "Yamato Matsuda and Ryo Tanaka and Takahiro Okuno and Azhar Uddin and Yoshiei Katou and Katsunori Takahashi and Eiji Kiso",
year = "2019",
month = "4",
day = "1",
doi = "10.2355/tetsutohagane.TETSU-2018-092",
language = "English",
volume = "105",
pages = "61--68",
journal = "Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan",
issn = "0021-1575",
publisher = "Iron and Steel Institute of Japan",
number = "4",

}

TY - JOUR

T1 - Long-term Alkali Elution Behavior from Steelmaking Slag into Seawater by an Open Channel Vessel

AU - Matsuda, Yamato

AU - Tanaka, Ryo

AU - Okuno, Takahiro

AU - Uddin, Azhar

AU - Katou, Yoshiei

AU - Takahashi, Katsunori

AU - Kiso, Eiji

PY - 2019/4/1

Y1 - 2019/4/1

N2 - Steelmaking slag has been used in the coastal area for the purpose of the environmental improvement. Short-term alkali elution behavior induced by free CaO in the steelmaking slag was investigated by a batch and continuous vessel. In this study, long-term alkali elution experiments were done in an open channel vessel with a slag box to make clear the decreasing mechanism of the alkali elution from steelmaking slag into seawater. The experimental period was 44 d (1056 h). The pH values increased just in the beginning of the experiment, and then gradually decreased in about 100 min. They showed almost the same value as that of seawater in 1200 min. As the experimental time passed, the white deposits on the steelmaking slag layer, which were composed of Mg[OH] 2 and CaCO 3 , spread to the lower slag zone in the slag box. The white deposit zone of larger slag size was more rapidly diffused downward than that of smaller one due to larger voidage in the slag layer. While carrying out the batch test with the used slag by the long-term experiment, the alkali elution rate of slag layer on the open channel flow was 0.03-0.11 times decreased compared with the unused slag, whereas that of the lower positioned slag layer was 0.10-0.38 times decreased. From these results, it was found that the alkali elution rate was reduced by the white deposit on the steelmaking slag.

AB - Steelmaking slag has been used in the coastal area for the purpose of the environmental improvement. Short-term alkali elution behavior induced by free CaO in the steelmaking slag was investigated by a batch and continuous vessel. In this study, long-term alkali elution experiments were done in an open channel vessel with a slag box to make clear the decreasing mechanism of the alkali elution from steelmaking slag into seawater. The experimental period was 44 d (1056 h). The pH values increased just in the beginning of the experiment, and then gradually decreased in about 100 min. They showed almost the same value as that of seawater in 1200 min. As the experimental time passed, the white deposits on the steelmaking slag layer, which were composed of Mg[OH] 2 and CaCO 3 , spread to the lower slag zone in the slag box. The white deposit zone of larger slag size was more rapidly diffused downward than that of smaller one due to larger voidage in the slag layer. While carrying out the batch test with the used slag by the long-term experiment, the alkali elution rate of slag layer on the open channel flow was 0.03-0.11 times decreased compared with the unused slag, whereas that of the lower positioned slag layer was 0.10-0.38 times decreased. From these results, it was found that the alkali elution rate was reduced by the white deposit on the steelmaking slag.

KW - Long-term alkali elution

KW - Open channel vessel

KW - Sea water

KW - Steelmaking slag

UR - http://www.scopus.com/inward/record.url?scp=85065334519&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85065334519&partnerID=8YFLogxK

U2 - 10.2355/tetsutohagane.TETSU-2018-092

DO - 10.2355/tetsutohagane.TETSU-2018-092

M3 - Article

AN - SCOPUS:85065334519

VL - 105

SP - 61

EP - 68

JO - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

JF - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

SN - 0021-1575

IS - 4

ER -