Prevention of Sulfide Leaching through Covalent Coating

Abstract

The use of benzene-1,3-diamidoethanethiol as a covalent surface coating for the prevention of metal leaching was demonstrated with several sulfide minerals including cinnabar (HgS), pyrite (FeS2), chalcopyrite (CuFeS2), covellite (CuS), galena (PbS), realgar (As4S4) and sphalerite (ZnS). The minerals were coated with sufficient H2BDT to bind the surface metals in a 1:1 ratio. Leaching at pH 1, 3 and 7 was then conducted on both treated and untreated minerals. ICP and CVAFS (for mercury) analyses revealed that the coated minerals showed a dramatic reduction in metal leaching as compared to uncoated control samples. X-ray photoelectron spectroscopy indicated the formation of covalent bonds between the sulphur of the ligand and the metals from the minerals.

Department(s)

Chemistry

Keywords and Phrases

Acid mine drainage; Heavy metals; Leaching

International Standard Serial Number (ISSN)

1024-1221

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2007 Taylor & Francis, All rights reserved.

Publication Date

01 Sep 2007

Link to Full Text

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