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Nickel speciation in cement-stabilized/solidified metal treatment filtercakes

Roy, A; Stegemann, JA; (2016) Nickel speciation in cement-stabilized/solidified metal treatment filtercakes. Journal of Hazardous Materials , 321 pp. 353-361. 10.1016/j.jhazmat.2016.09.027. Green open access

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Abstract

Cement-based stabilization/solidification (S/S) is used to decrease environmental leaching of contaminants from industrial wastes. In this study, two industrial metal treatment filtercakes were characterized by X-ray diffractometry (XRD), thermogravimetric and differential thermogravimetric analysis (TG/DTG) and Fourier transform infrared (FTIR); speciation of nickel was examined by X-ray absorption (XAS) spectroscopy. Although the degree of carbonation and crystallinity of the two untreated filtercakes differed, α-nickel hydroxide was identified as the primary nickel-containing phase by XRD and nickel K edge XAS. XAS showed that the speciation of nickel in the filtercake was unaltered by treatment with any of five different S/S binder systems. Nickel leaching from the untreated filtercakes and all their stabilized/solidified products, as a function of pH in the acid neutralization capacity test, was essentially complete below pH ∼5, but was 3–4 orders of magnitude lower at pH 8–12. S/S does not respeciate nickel from metal treatment filtercakes and any reduction of nickel leaching by S/S is attributable to pH control and physical mechanisms only. pH-dependent leaching of Cr, Cu and Ni is similar for the wastes and s/s products, except that availability of Cr, Cu and Zn at decreased pH is reduced in matrices containing ground granulated blast furnace slag.

Type: Article
Title: Nickel speciation in cement-stabilized/solidified metal treatment filtercakes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jhazmat.2016.09.027
Publisher version: https://doi.org/10.1016/j.jhazmat.2016.09.027
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Technology, Life Sciences & Biomedicine, Engineering, Environmental, Environmental Sciences, Engineering, Environmental Sciences & Ecology, Stabilization/solidification, X-ray absorption spectroscopy, Electroplating sludge, Waste treatment, Wasteform, Leaching, RAY-ABSORPTION SPECTROSCOPY, IMMOBILIZATION PROCESSES, HEAVY-METALS, NI UPTAKE, PASTE, HYDROXIDES, WASTE, STABILIZATION, ENCAPSULATION, CHROMIUM
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1518449
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