Speciation of copper in plasma-melted slag

Huang, Yu Chun; Wang, H. Paul; Huang, Hsin-Liang; Huang, Yumeng; Chang, Juu En; Wei, Yu‐Ling

doi:10.1016/j.elspec.2006.11.056

Cited by 4 publications

(6 citation statements)

References 11 publications

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“…The derivative line of the CuCl 2 XANES spectrum has two sharp peaks at 8.980 and 8.989 keV. The sharp peaks of CuCl 2 ·2H 2 O appear at 8.981 and 8.985 keV, while for CuO and CuSO 4 ·5H 2 O, two sharp peaks are present at 8.978 and 8.986 keV and 8.982 and 8.988 keV, respectively ,,− .…”

Section: Resultsmentioning

confidence: 97%

Investigating the Speciation of Copper in Secondary Fly Ash by X-ray Absorption Spectroscopy

Tian

Wei

et al. 2009

Environ. Sci. Technol.

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Although some researchers have reported that chlorides may play an important part in the evaporation of copper during heat treatment of municipal solid waste incinerators (MSWI) fly ash (1, 2) , details on the copper speciation in volatile matters (secondary fly ash, SFA) are still lacking. In this work, we used in situ X-ray absorption spectroscopy (XAS) experiments involving three types of SFA, which was collected from a high-temperature tubular electric furnace by thermal treatment of municipal solid waste incinerator (MSWI) fly ash at 1000, 1150, and 1250 degrees C. The results obtained by a linear combination fit (LCF) of X-ray absorption near edge structure (XANES) spectra revealed that in MSWI fly ash copper mainly exists as CuO and CuSO(4).5H(2)O while chloride almost dominated all the content of the SFA conformation, which was more than 80%. Extended X-ray absorption fine structure (EXAFS) data analysis indicated the presence of both Cu-O and Cu-Cl bonds in the first coordination shell of Cu ions in all SFA, while only Cu-O bonds occur in the MSWI fly ash. Consequently, in the MSWI fly ash during heat treatment copper evaporated as chloride, and the latter plays an important role in the formation of copper chloride.

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Section: Resultsmentioning

confidence: 97%

Investigating the Speciation of Copper in Secondary Fly Ash by X-ray Absorption Spectroscopy

Tian

Wei

et al. 2009

Environ. Sci. Technol.

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“…In addition to data for the ash samples, XAS data were also collected for a number of model compounds that were considered possible to find in ashes. The following 18 All XAS data were collected around the copper K-edge, which is the increase in absorption at energies equal to or higher than the binding energies of the innermost K (1s) electrons of copper. Copper K-edges spectra were collected at room temperature and at ambient atmospheric pressure at beamline I811 using a Si(111) double crystal monochromator.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…Some results from speciation of copper in ashes by XAS can be found in the literature. − In most of these investigations, only the fly ashes were studied. The results indicate that Cu II is the most common oxidation state in fly ashes and that oxides, hydroxides, chlorides, and sulfates are the most common compounds, in varying concentrations.…”

Section: Introductionmentioning

confidence: 99%

Speciation of Copper in Ash from a Fluidized-Bed Boiler Fired with Municipal Solid Waste

Lassesson

Steenari

2013

Energy Fuels

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Copper is one of the most important trace elements in municipal solid waste (MSW) combustion. Knowledge of the speciation of copper is fundamental for the understanding of the effects of copper compounds on the combustion chemistry, the evaluation of the environmental effects of copper in ash leachates, and the development of methods to recover copper from the MSW combustion ash. In this work, an investigation of the speciation of copper in four ash flows from a bubbling fluidizedbed boiler using synchrotron-based X-ray absorption spectrometry is reported. The results showed that copper occurs in oxidation states 0, +1, and +2 in the bed ash and the cyclone ash, i.e., 10−20% Cu 0 , 25−35% Cu I , and 50−60% Cu II , whereas the filter ash contained copper only in oxidation state +2. The most common copper compounds in the bed ash are copper metal, Cu 2 O, CuO, and mixed oxides, such as CuCr 2 O 4 . The cyclone ash probably contained a mix of copper metal, Cu 2 O, CuCl, Cu(OH) 2 , and CuSO 4 ·5H 2 O, possibly also CuO. Copper sulfate was found as one of the major species in the filter ash together with a mix of hydroxides and chlorides.

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“…X-ray diffraction (XRD) also did not provide structural information about zinc, whereas X-ray absorption spectroscopy (XAS) proved to be a reliable technique capable of identifying different Zn species eventually present in SFA samples and returned reliable structural information on the Zn environments. It has been previously applied to the investigation of other hazardous wastes (Struis et al, 2004;Huang et al, 2007;Mansour & Melendres, 1998;O'Day & Carroll, 1998). However, this is the first investigation of real flue gases generated during the heating process.…”

Section: Introductionmentioning

confidence: 99%

Speciation of zinc in secondary fly ashes of municipal solid waste at high temperatures

Tian

Chu

et al. 2009

J Synchrotron Radiat

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The evaporation aerosols produced during the vitrification process of municipal solid waste incinerators (MSWI) fly ash represent a potential environmental risk owing to their high content of heavy metals. In this research, high-temperature heating processes were carried out on fly ashes collected from bag houses in a Chinese MSWI plant and the secondary fly ashes (SFA) were separately collected at three high temperatures (1273 K, 1423 K and 1523 K) below the melting range. Elemental analysis showed that high contents of both zinc and chlorine were present in these SFA samples and, according to the standard of the heavy metals industrial grade of ore, SFAs can be re-used as metallurgical raw materials or rich ore. Moreover, as shown by XAS analysis and for different high temperatures, zinc environments in the three SFA samples were characterized by the same local structure of the zinc chloride. As a consequence, a zinc recycling procedure can be easily designed based on the configuration information.

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Speciation of copper in plasma-melted slag

Cited by 4 publications

References 11 publications

Investigating the Speciation of Copper in Secondary Fly Ash by X-ray Absorption Spectroscopy

Investigating the Speciation of Copper in Secondary Fly Ash by X-ray Absorption Spectroscopy

Speciation of Copper in Ash from a Fluidized-Bed Boiler Fired with Municipal Solid Waste

Speciation of zinc in secondary fly ashes of municipal solid waste at high temperatures

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