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期刊论文
XPS characteristics of sulfur of bio-oxidized arsenic-bearing gold concentrate and changes of surface nature of bio-oxidation residue①
Trans. Nonferrous Met. Soc. China Dec.2004 Vol. 14 No.6,-0001,():
During bio-oxidation of sulfides, the chemical state change of sulfur is a complex and key factor. It is not only an in-dicator of the extent and intensity of the bio-oxidation, but also controls the property of bio-leaching medium and the period of oxi-dation. 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 [S2]2-to [SO4]2-; sulfur in the core is in a reduction state, S2-or [S2] 2-, but exists in an oxida-tion 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.
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