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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 14    No. 6    December 2004

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XPS characteristics of sulfur of bio-oxidized arsenic-bearing gold concentrate and changes of surface nature of  bio-oxidation residue
YANG Hong-ying(杨洪英), GONG En-pu(巩恩普), YANG Li(杨 立),
CHEN Gang(陈 刚), FAN You-jing(范有静), 
ZHAO Yu-shan(张玉山), LÜ Jiu-ji(吕久吉)

School of Materials and Metallurgy, Northeastern University, 
Shenyang 110004, China

Abstract: During bio-oxidation of sulfides, the chemical state change of sulfur is a complex and key factor. It is not only an indicator of the extent and intensity of the bio-oxidation, but also controls the property of bio-leaching medium and the period of oxidation. The chemical state of sulfur in sulfides oxidized by leaching bacteria was studied with XPS. Sulfide minerals in the arsenic-bearing gold concentrate consist of pyrite, arsenopyrite, chalcopyrite, galena, sphalerite and so on. In order to probe the pattern of the chemical state change of sulfur in the bio-oxidation residue of arsenic-bearing gold concentrate, the structure of the grains, and the surface nature of the residue, XPS test was carried out through different sputtering duration. The study of XPS clearly shows that: sulfides is progressively oxidized from the surface of minerals to the core by leaching bacteria; the chemical valence of sulfur changes from S2- or[S22- to [SO42-; sulfur in the core is in a reduction state, S2- or[S22-, but exists in an oxidation state S6+ on the surface; due to the chemical state change of sulfur, mineral phase of the bio-oxidation residue is also changed(sulfides inside, while sulfates outside); the layered structure is found in the grains of the bio-oxidation residue.

 

Key words:  bio-oxidation; arsenic-bearing gold concentrate; XPS;  chemical state; sulfur; surface nature

ISSN 1672-7029
CN 43-1423/U

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