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Open AccessArticle

Effect of Additive Material on Controlling Chromium (Cr) Leaching from Coal Fly Ash

Environmental and Renewable Energy Systems Division, Graduate School of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
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Minerals 2020, 10(6), 563; https://doi.org/10.3390/min10060563
Received: 22 May 2020 / Revised: 19 June 2020 / Accepted: 20 June 2020 / Published: 23 June 2020
(This article belongs to the Special Issue Cleaner Production in Mineral Processing)
Coal fly ash contains a considerable number of toxic elements that can be leached into the environment, such as chromium (Cr), thereby quickly leading to severe contaminations. In this research, the leaching behaviors of Cr were analyzed from 14 kinds of coal fly ash samples collected from the electrostatic precipitators of coal-fired thermal power plants in Japan. The level of Cr concentration found in the samples varied from 0.00 to 82.93 μg/L. However, Cr toxicity depends on its valence state; Cr6+ is more toxic than Cr3+. Additive materials containing high calcium content were used to control the leaching concentration of Cr, such as Ca(OH)2, paper sludge ash, and blast furnace cement. This research used several instruments. An X-ray fluorescence was adopted to measure the major chemical composition of the fly ash samples and the additive materials. A thermogravimetric analyzer was used to examine the calcium compounds in the additive materials. Inductively coupled plasma was used to determine the Cr leaching concentrations from the fly ash samples. Findings showed that the three-additive mixture had a promising effect on controlling the Cr leaching concentrations. These results were also supported by FactSage 7.2 simulation. View Full-Text
Keywords: chromium; coal fly ash; additive material; leaching; FactSage chromium; coal fly ash; additive material; leaching; FactSage
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MDPI and ACS Style

Desfitri, E.R.; Sutopo, U.M.; Hayakawa, Y.; Kambara, S. Effect of Additive Material on Controlling Chromium (Cr) Leaching from Coal Fly Ash. Minerals 2020, 10, 563. https://doi.org/10.3390/min10060563

AMA Style

Desfitri ER, Sutopo UM, Hayakawa Y, Kambara S. Effect of Additive Material on Controlling Chromium (Cr) Leaching from Coal Fly Ash. Minerals. 2020; 10(6):563. https://doi.org/10.3390/min10060563

Chicago/Turabian Style

Desfitri, Erda R.; Sutopo, Ulung M.; Hayakawa, Yukio; Kambara, Shinji. 2020. "Effect of Additive Material on Controlling Chromium (Cr) Leaching from Coal Fly Ash" Minerals 10, no. 6: 563. https://doi.org/10.3390/min10060563

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