(東北大學(xué) 材料與冶金學(xué)院， 沈陽 110006)
摘 要: 采用優(yōu)良的氧化亞鐵硫桿菌SH-T菌株對含金毒砂拋光片和純毒砂粉末進(jìn)行氧化試驗，并作了定時定域的顯微觀察分析，研究了每一階段毒砂表面的性質(zhì)和毒砂氧化膜的形成過程。毒砂在細(xì)菌氧化后覆蓋了黃色氧化膜，抑制了細(xì)菌的快速氧化。用X射線粉晶衍射法對細(xì)菌氧化產(chǎn)物進(jìn)行物相分析，結(jié)果表明氧化物的主要成分為黃鉀鐵礬，其次為砷華。細(xì)菌氧化膜的X射線光電子譜分析表明毒砂晶體中As表現(xiàn)出［AsS］2-→As(Ⅲ)→As(Ⅴ)的價態(tài)變化過程，揭示了細(xì)菌氧化過程中毒砂形貌變化規(guī)律和晶體的內(nèi)在聯(lián)系。
關(guān)鍵字: 氧化亞鐵硫桿菌； 毒砂； 細(xì)菌氧化
Thiobacillus ferrooxidans strain SH-T
（School Materials and Metallugy, Northeastern University，
Shenyang 110006，P.R.China）
Abstract:Bacterial oxidation tests of the polished sections of goldbearing arsenopyrite and pure arsenopyrite powder were conducted with a fine thiobacillus ferrooxidans named SH-T. The arsenopyrite polished sections during the whole process of bacterial oxidation were observed and analyzed at 12 h intervals under the microscope in order to study the surface character of arsenopyrite at the every phase and the formation course of oxidation film on the crystal surface. The compositions of oxidation film which could restrain biooxidation of arsenopyrite were indicated as jarosite and arsenolite by XRD. After the arsenopyrite crystals are oxidized, As state of the arsenopyrite crystal are transformed from ［AsS］2- and As(Ⅲ) to As(Ⅴ)， which reveals the oxidation regularity of the arsenopyrite surface and its inner relation.
Key words: thiobacillus ferrooxidans; arsenopyrite; bacterial oxidation
