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Technologies 2018, 6(3), 79; https://doi.org/10.3390/technologies6030079

A Suppression Method for Elution of F, [B(OH)4], AsO43−, and CrO42− from Industrial Wastes Using Some Inhibitors and Crushed Stone Powder

1
Department of Chemistry and Chemical Engineering, Graduate School of Science and Engineering, Yamagata University, Jonan, Yonezawa 4-3-16, Yamagata 992-8510, Japan
2
Department of Chemistry and Chemical Engineering, Faculty of Engineering, Yamagata University, Jonan, Yonezawa 4-3-16, Yamagata 992-8510, Japan
*
Author to whom correspondence should be addressed.
Received: 20 July 2018 / Revised: 13 August 2018 / Accepted: 14 August 2018 / Published: 19 August 2018
(This article belongs to the Special Issue Smart Systems)
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Abstract

The disposal and the reuse of industrial wastes have become increasingly difficult due to the elution of hazardous anions, such as F, [B(OH)4], AsO43, and CrO42. Effective methods for removing hazardous ions and reusing solid wastes are urgently required. In this study, Ca(OH)2, MgCl2, and BaCl2 were added to reduce the elution concentrations of F, B, As, and Cr by coprecipitating insoluble inorganic salts. After this, ordinary Portland cement (OPC) was added to the ion exchange and solidified with these hazardous ion-containing substances. The addition of crushed stone powder (CSP), which was a by-product of the process of crushing aggregates or sawing stone, inhibited the elution of hazardous ions and improved the inhibition effect of OPC. The elution concentrations of F, B, As, and Cr were successfully reduced from their maximum elution concentration of 10 mg/L to below the environmental standards values of Japan. A simultaneous inhibition method for the elution of F, B, As, and Cr from industrial wastes has been developed successfully and would be able to promote the reuse and recycling of CSP and other industrial wastes. View Full-Text
Keywords: hazardous anions; solidification; crushed stone powder hazardous anions; solidification; crushed stone powder
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Kuang, X.; Sentoku, A.; Sasaki, A.; Endo, M. A Suppression Method for Elution of F, [B(OH)4], AsO43−, and CrO42− from Industrial Wastes Using Some Inhibitors and Crushed Stone Powder. Technologies 2018, 6, 79.

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