Document Detail

Speciation of Zn in blast furnace sludge from former sedimentation ponds using synchrotron X-ray diffraction, fluorescence, and absorption spectroscopy.
MedLine Citation:
PMID:  23035937     Owner:  NLM     Status:  Publisher    
Blast furnace sludge (BFS), an industrial waste generated in pig iron production, typically contains high contents of iron and various trace metals of environmental concern, including Zn, Pb, and Cd. The chemical speciation of these metals in BFS is largely unknown. Here, we used a combination of synchrotron X-ray diffraction, fluorescence, and absorption spectroscopy at the Zn K-edge for solid-phase Zn speciation in twelve BFS samples collected on a former BFS sedimentation pond site. Additionally, one fresh BFS was analyzed for comparison. We identified five major types of Zn-species in the BFS, which occurred in variable amounts: (1) Zn in the octahedral sheets of phyllosilicates, (2) Zn sulfide minerals (ZnS, sphalerite or wurtzite), (3) Zn in a KZn-ferrocyanide phase (K2Zn3[Fe(CN)6]2•9H2O), (4) hydrozincite (Zn5(OH)6(CO3)2), and (5) tetrahedrally coordinated adsorbed Zn. The minerals franklinite (ZnFe2O4) and smithsonite (ZnCO3) were not detected, and zincite (ZnO) only in traces. The contents of ZnS were positively correlated with the total S contents of the BFS. Similarly, the abundance of the KZn-ferrocyanide phase was closely correlated with the total CN contents, with the stoichiometry suggesting this as the main cyanide phase. This study provides the first quantitative Zn speciation in BFS deposits, which is of great relevance for environmental risk assessment, the development of new methods for recovering Zn and Fe from BFS, and potential applications of BFS as sorbent materials in waste water treatment.
Ruben Kretzschmar; Tim Mansfeldt; Petar Nikolov Mandaliev; Kurt Barmettler; Matthew A Marcus; Andreas Voegelin
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-5
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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