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Open AccessArticle

Utilization of Boiler Slag from Pulverized-Coal-Combustion Power Plants in China for Manufacturing Acoustic Materials

1
Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Wuhan 430074, China
2
Chemical and Environmental Engineering Department, Engineering School, University of Seville, E-41092 Seville, Spain
3
Institute of Environmental Assessment and Water Research, CSIC, C/Jordi Girona 18-26, 08034 Barcelona, Spain
*
Author to whom correspondence should be addressed.
Energies 2020, 13(21), 5705; https://doi.org/10.3390/en13215705
Received: 28 September 2020 / Revised: 27 October 2020 / Accepted: 28 October 2020 / Published: 31 October 2020
(This article belongs to the Special Issue Materials Recycling and Energy Use of Waste)
The potential utilization of boiler slag generated in large amounts from pulverized-coal-combustion (PCC) power plants has recently drawn much attention due to the serious problems caused to ecosystems. In order to make maximal use of the boiler slag and reduce the environmental risk it poses, this study focused on manufacturing acoustic materials using boiler slag from Chinese PCC power plants. Three promising acoustic materials were successfully manufactured from up to 80% boiler slag with different grain sizes, with the addition of 20% Portland cement. The density and compressive strength of the products were inversely proportional and the sound absorption coefficient was positively proportional to the grain size of the boiler slag. The best sound absorption coefficient was obtained in products made from the coarsest fraction of the boiler slag (MS-C). Nonetheless, all the boiler-slag-based acoustic products still demonstrated compressive strength and densities comparable to those of other acoustic materials made of Spanish bottom ash or other conventional/recycled materials. The acoustic products made from the coarsest fraction (MS-C) and medium fraction (MS-M) of the boiler slag presented good noise absorption characteristics, like those of the commercial coarse porous cement that is traditionally used as an acoustic product. Furthermore, the acoustic products were characterized by very low leach ability of potentially hazardous elements. Consequently, the manufacture of acoustic materials is a very promising application for boiler slag. On the one hand, it consumes huge amounts of boiler slag that is generated in large amounts in China. On the other hand, the acoustic products can be used extensively to produce road acoustic barriers with a high sound absorption efficiency, no significant physical or mechanical limitations and no environmental implication. View Full-Text
Keywords: acoustic barrier; boiler slag; sound absorption coefficients; leachable potential; PCC power plant acoustic barrier; boiler slag; sound absorption coefficients; leachable potential; PCC power plant
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MDPI and ACS Style

Li, J.; Zhuang, X.; Leiva, C.; Arenas, C.; Cornejo, A.; Querol, X.; Moreno, N.; Font, O.; Fernández Pereira, C. Utilization of Boiler Slag from Pulverized-Coal-Combustion Power Plants in China for Manufacturing Acoustic Materials. Energies 2020, 13, 5705. https://doi.org/10.3390/en13215705

AMA Style

Li J, Zhuang X, Leiva C, Arenas C, Cornejo A, Querol X, Moreno N, Font O, Fernández Pereira C. Utilization of Boiler Slag from Pulverized-Coal-Combustion Power Plants in China for Manufacturing Acoustic Materials. Energies. 2020; 13(21):5705. https://doi.org/10.3390/en13215705

Chicago/Turabian Style

Li, Jing; Zhuang, Xinguo; Leiva, Carlos; Arenas, Celia; Cornejo, Ana; Querol, Xavier; Moreno, Natalia; Font, Oriol; Fernández Pereira, Constantino. 2020. "Utilization of Boiler Slag from Pulverized-Coal-Combustion Power Plants in China for Manufacturing Acoustic Materials" Energies 13, no. 21: 5705. https://doi.org/10.3390/en13215705

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