XAS study of chromium recoverable from plating sludge

Yu Ling Wei, Lee How Hsu, Hong-Paul Wang, Kai Wen Chen

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Because global natural metal resources are depleting, this study aim to examine the chemical feasibility of recovering chromium as Cr(VI) from a Cr(OH)3-containing plating sludge through a co-heating procedure of the plating sludge with a incinerator fly ash that is rich in calcium hydroxide. The critical step in the process of recovering Cr from plating sludge would be to convert the water-insoluble Cr(OH)3 into water-soluble Cr(VI). Results from Cr K-edge X-ray absorption near edge spectrum (XANES) suggest that majority of the Cr is in the form of CaCrO4 after the co-heating procedure of plating sludge and the incinerator fly ash at different temperatures. Heating the mixture of the plating sludge and the incinerator fly ash results in an oxidation of Cr(OH)3 that is basically water insoluble to Cr(VI) which is water soluble, consequently more Cr(VI) can be extracted with water and recovered from the heated mixture than from the non-heated plating sludge.

Original languageEnglish
Pages (from-to)204-207
Number of pages4
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume156-158
DOIs
Publication statusPublished - 2007 May 1

Fingerprint

sludge
Chromium
plating
Plating
chromium
Coal Ash
incinerators
fly ash
Refuse incinerators
Sewage sludge
Fly ash
Water
water
Heating
heating
Calcium Hydroxide
Hydrated lime
X ray absorption
hydroxides
calcium

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

Cite this

Wei, Yu Ling ; Hsu, Lee How ; Wang, Hong-Paul ; Chen, Kai Wen. / XAS study of chromium recoverable from plating sludge. In: Journal of Electron Spectroscopy and Related Phenomena. 2007 ; Vol. 156-158. pp. 204-207.
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XAS study of chromium recoverable from plating sludge. / Wei, Yu Ling; Hsu, Lee How; Wang, Hong-Paul; Chen, Kai Wen.

In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 156-158, 01.05.2007, p. 204-207.

Research output: Contribution to journalArticle

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AB - Because global natural metal resources are depleting, this study aim to examine the chemical feasibility of recovering chromium as Cr(VI) from a Cr(OH)3-containing plating sludge through a co-heating procedure of the plating sludge with a incinerator fly ash that is rich in calcium hydroxide. The critical step in the process of recovering Cr from plating sludge would be to convert the water-insoluble Cr(OH)3 into water-soluble Cr(VI). Results from Cr K-edge X-ray absorption near edge spectrum (XANES) suggest that majority of the Cr is in the form of CaCrO4 after the co-heating procedure of plating sludge and the incinerator fly ash at different temperatures. Heating the mixture of the plating sludge and the incinerator fly ash results in an oxidation of Cr(OH)3 that is basically water insoluble to Cr(VI) which is water soluble, consequently more Cr(VI) can be extracted with water and recovered from the heated mixture than from the non-heated plating sludge.

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