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2006年01月17日

【期刊论文】Submicro2battery effect and selective bio-oxidation model of gold-bearing arsenopyrite by Thiobacillus ferrooxidans①

杨洪英, YANG Hong-ying, YANGLi, ZHAO Yu-shan, CHEN Gang, LU Jiu-ji, FAN You-jing

Trans. Nonferrous Met. Soc. China Dec.2002 Vol. 12 No.6,-0001,():

-1年11月30日

摘要

Through the study by electronic probe it was found that many new cracks and holes appear on the surface of gold-bearing arsenopyrite crystal oxidized by Thiobacillus ferrooxidans, which are along with some directions. Then the selective bio-oxidation model of gold-bearing arsenopyrite was set up. The selective bio-oxidation resulting from the submicro-battery effect of gold/arsenopyrite mineral pairs naturally forms in the gold-bearing arsenopyrite crystal. Thiobacillus ferrooxidans has priority to oxidize the place of gold-rich and oxidizes selectedly along with the crystal border, crystal face and crack. The bacteria oxida-tion process of gold-bearing arsenopyrite is divided into three stages: the first stage is the surface oxidation, the second stage is restraining oxidation and the third stage is the filament oxidation, bacteria oxidize along with cracks of arsenopyrite.

selective bio-oxidation model, submicro-battery effect, gold-bearing arsenopyrite, Thiobacillus ferrooxidans

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2006年01月17日

【期刊论文】XPS characteristics of sulfur of bio-oxidized arsenic-bearing gold concentrate and changes of surface nature of bio-oxidation residue①

杨洪英, YANG Hong-ying, GONG En-pu, YANG Li, CHEN Gang, FAN You-jing, ZHAO Yu-shan, LBJiu-ji

Trans. Nonferrous Met. Soc. China Dec.2004 Vol. 14 No.6,-0001,():

-1年11月30日

摘要

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.

bio-oxidation, arsenic-bearing gold concentrate, XPS, chemical state, sulfur, surface nature

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2006年01月17日

【期刊论文】广西某难处理金矿金的赋存状态研究*

杨洪英, Yang Hong-Ying, Yang Li, Fan You-Jing, Chen Gang, Zhao Yu-Shan, Lu Jiu-Ji

贵金属,2003,24(4):32~35,-0001,():

-1年11月30日

摘要

研究了广西某难处理金精矿的化学成分、矿物成分、粒度分布和金的赋存状态。研究表明金的品位为144g/t,银的品位为35g/t,砷含量为2215%。金、银含量在各粒级中分布不均匀,不同粒级金、银品位不同,在<74μm粒级中金的品位最高达154.0g/t,银的品位为45g/t,砷为2416%。金的载体矿物主要是毒砂,其次是黄铁矿,金以超微细粒和次显微金包裹于毒砂和黄铁矿中。

难处理金矿, 金赋存状态, 载金矿物, 毒砂, 黄铁矿

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2006年01月17日

【期刊论文】浸矿菌液/天然黄铁矿界面的动态氧化研究

杨洪英, YANG Hong-ying, GONG En-pu, ZHAO Yu-shan, CHEN Gang

东北大学学报(自然科学版),2004,25(9):895~898,-0001,():

-1年11月30日

摘要

细菌氧化黄铁矿的过程是细菌破坏黄铁矿化学键和建立新化学键的过程。细菌在浸矿菌液/天然黄铁矿界面上产生一系列的生物化学反应。由于黄铁矿的(100),(110),(111)面上亚铁离子和对硫离子团的分布形式、密度不相同,因此菌液/黄铁矿各种界面的氧化腐蚀程度也有差异。通过对天然黄铁矿(100),(110)和(111)面的细菌氧化动态试验研究,可以将细菌氧化黄铁矿的过程分为三个阶段:第一阶段是黄铁矿的点状氧化阶段;第二阶段为黄铁矿面状氧化阶段;第三阶段为黄铁矿遭到严重的氧化腐蚀,最终导致晶体破坏。细菌对黄铁矿不同面氧化强度顺序为(111)>(110)>(100)。

浸矿细菌, 黄铁矿, 晶面, 动态细菌氧化

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2006年01月17日

【期刊论文】难处理金矿石中硫化物细菌氧化的活性序列

杨洪英, YANG Hongying, YANGLi, ZHAO Yushan, CHEN Gang, LU Jiuji, FAN Youjing

有色金属,2002,54(2):42~44,-0001,():

-1年11月30日

摘要

通过显微镜观察难处理金矿石中硫化物矿物对的细菌氧化过程,以硫化物矿物对的显微电池模式为基础,得出硫化矿物细菌氧化的活性系列。难处理金矿石中常见矿物细菌氧化活性序列由强至弱依次为:毒砂→闪锌矿→方铅矿→黝铜矿→辉锑矿→黄铜矿→黄铁矿→金矿物。

硫化物矿物对, 细菌氧化, 难处理金矿石, 活性序列

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  • 杨洪英 邀请

    东北大学,辽宁

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