Prevention of sulfide mineral leaching through covalent coating

被引：5
|
作者：
Zaman, K. M. [1 ]
Chusuei, C. [2 ]
Blue, L. Y. [1 ]
Atwood, D. A. [1 ]
机构：
[1] Univ Kentucky, Dept Chem, Lexington, KY 40506 USA
[2] Univ Missouri, Dept Chem, Rolla, MO 65409 USA
来源：
MAIN GROUP CHEMISTRY | 2007年 / 6卷 / 3-4期
关键词：
mineral processing; heavy metals; leaching; acid mine drainage; benzene-1,3-diamidoethanethiol; BDT;
D O I：
10.1080/10241220802075723
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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.
引用
收藏
页码：169 / 184
页数：16
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