Detoxification and immobilization of chromite ore processing residue in spinel-based glass-ceramic

Chang Zhong Liao, Yuanyuan Tang, Po Heng Lee, Chengshuai Liu, Kaimin Shih, Fangbai Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

52 Citations (Scopus)


A promising strategy for the detoxification and immobilization of chromite ore processing residue (COPR) in a spinel-based glass-ceramic matrix is reported in this study. In the search for a more chemically durable matrix for COPR, the most critical crystalline phase for Cr immobilization was found to be a spinel solid solution with a chemical composition of MgCr1.32Fe0.19Al0.49O4. Using Rietveld quantitative X-ray diffraction analysis, we identified this final product is with the phases of spinel (3.5 wt.%), diopside (5.2 wt.%), and some amorphous contents (91.2 wt.%). The partitioning ratio of Cr reveals that about 77% of the Cr was incorporated into the more chemically durable spinel phase. The results of Cr K-edge X-ray absorption near-edge spectroscopy show that no Cr(VI) was observed after conversion of COPR into a glass-ceramic, which indicates successful detoxification of Cr(VI) into Cr(III) in the COPR-incorporated glass-ceramic. The leaching performances of Cr2O3and COPR-incorporated glass-ceramic were compared with a prolonged acid-leaching test, and the results demonstrate the superiority of the COPR-incorporated glass-ceramic matrix in the immobilization of Cr. The overall results suggest that the use of affordable additives has potential in more reliably immobilizing COPR with a spinel-based glass-ceramic for safer disposal of this hazardous waste.
Original languageEnglish
Pages (from-to)449-455
Number of pages7
JournalJournal of Hazardous Materials
Publication statusPublished - 5 Jan 2017


  • Chromite ore processing residue (COPR)
  • Detoxification
  • Glass-ceramic
  • Immobilization
  • Rietveld quantitative XRD

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis


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