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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 S^2- or [S2]^2- to [SO4]^2- ; sulfur in the core is in a reduction state, S^2- or [S2]^2- , but exists in an oxidation state S^6 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. 相似文献
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Submicro-battery effect and selective bio-oxidation model of gold-bearing arsenopyrite by Thiobacillus ferrooxidans 总被引:2,自引:2,他引:2
1 INTRODUCTIONTherearemanykindsofsulphideminerals,suchasarsenopyrite ,pyrite,chalcopyrite ,sphalerite ,galena,pyrrhotite,stibnite ,tet 相似文献
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粗金粉(Au含量70% ̄80%)和粗银粉(Ag含量90%以上)混合熔铸成含金较高的阳极(Au:Ag≈1:3),采用一次电解工艺分离提纯,最终产品金锭成色〉99%,银锭中银含量〉99.9%。工艺过程简单,投资操作费用较低。 相似文献
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亚硫酸盐无氰镀银工艺 总被引:8,自引:0,他引:8
研究了以亚硫酸协为主络合剂的无氰镀银工艺,研究中发现加入一种添加剂,可大大提高镀液的稳定性,并使镀层光亮细致。同时,还研究了温度、pH值,添加剂等对镀液性能及镀银层性能的影响。 相似文献
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提高金银浮选回收率的试验研究 总被引:3,自引:0,他引:3
对赤峰某金矿进行提高金银浮选回收率的试验研究,通过XRD/SEMEnergy Spectrum对样品的物相组成、金银赋存状态及嵌布粒度进行检测;考察了磨矿细度、捕收剂及辅助剂用量、扫选时间及矿浆pH值对浮选效果的影响;通过精选实验、开路综合条件试验和闭路试验研究,结果表明,浮选时加入T12,抑制细泥及硫化氧化矿,产出精矿中Au品位可达60.2g/t,浮选回收率可达87.50%;精矿中Ag品位可达6 767 g/t,浮选回收率可达到75.21%,确定适宜该矿石性质的工艺条件及工艺流程,获得的金精矿可作为混合精矿外售。 相似文献