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Suppression of Hydrogen Gas Evolution from Cement-Solidified MSWI Fly Ash

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Title: Suppression of Hydrogen Gas Evolution from Cement-Solidified MSWI Fly Ash
Authors: Ichikawa, Tsuneki Browse this author →KAKEN DB
Yamada, Kazuo Browse this author
Osako, Masahiro Browse this author
Haga, Kazuko Browse this author
Issue Date: 18-Oct-2017
Publisher: 日本コンクリート工学会
Journal Title: Journal of Advanced Concrete Technology
Volume: 15
Issue: 10
Start Page: 574
End Page: 578
Publisher DOI: 10.3151/jact.15.574
Abstract: Cement solidification/stabilization is an effective way of suppressing the leaching of hazardous materials from municipal solid waste incinerator (MSWI) fly ash, though the solidification of the fly ash from fluidized bed incinerators has been difficult because it causes the evolution of hydrogen gas by the reaction of contained metallic aluminum and alkaline water and results in the formation of porous and brittle solid. We found that the evolution of hydrogen gas is possible to be suppressed by improving the mixing method of the ingredients and controlling the amount of CaCl₂ in the mixture. Thorough mixing of the fly ash and cement powders with a drum-type mixer and subsequent addition of water at once scarcely induces the mechanical destruction of protective oxide layers surrounding metallic aluminum particles during the mixing process, so that the aluminum particles are protected from the attack of alkaline water. Water soluble CaCl₂ externally added and/or contained in the fly ash helps not only the homogeneous penetration of water into the powder mixtures but also reduces the alkalinity of water, so that it suppresses the evolution of hydrogen gas.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 市川 恒樹

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