中度嗜熱菌浸出黃鐵礦過程中礦物表面硫的化學形態

何環; 楊益; 夏金蘭; 陶秀祥; 趙屹東

doi:10.13374/j.issn1001-053x.2011.11.008

中度嗜熱菌浸出黃鐵礦過程中礦物表面硫的化學形態

doi: 10.13374/j.issn1001-053x.2011.11.008

1. 中國礦業大學化工學院煤炭加工與潔凈利用教育部重點實驗室, 徐州 221116;
2. 中南大學資源加工與生物工程學院生物冶金教育部重點實驗室, 長沙 410083;
3. 中國科學院高能物理研究所國家同步輻射實驗室, 北京 100049

基金項目:

中央高校基本科研業務費專項資金資助項目(2010QNA15)

中國博士后基金資助項目(20100481182)

國家自然科學基金資助項目(50974140)

詳細信息

通訊作者:
何環,E-mail:hehuan6819@cumt.edu.cn

中圖分類號: TF925.5
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出版歷程
- 收稿日期: 2011-02-28
- 網絡出版日期: 2021-07-30

Sulfur speciation on the surface of pyrite leached by moderate thermophiles

1. Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), School Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China;
2. Key Lab of Biometallurgy (Ministry of Education), School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
3. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Science, Beijing 100049

摘要

摘要: 利用掃描電鏡(SEM)、X射線衍射(XRD)和硫的K邊X射線吸收近邊結構光譜(XANES)等分析手段研究了中度嗜熱菌(Sulfobacillus thermosulfidooxidans)浸出黃鐵礦過程及礦物表面硫的化學形態.結果表明:中度嗜熱菌明顯促進了黃鐵礦的溶出,24 d浸出液中總鐵的質量濃度達到5.3 g·L^-1.經24 d細菌處理后,礦物表面形貌變化明顯,出現良好結晶狀態的晶體.浸出過程中累積在黃鐵礦表面的主要成分是黃鉀鐵礬.礦物表面硫的形態組分主要為黃鐵礦和黃鉀鐵礬,其質量分數分別為34.8%和65.2%.
- 黃鐵礦 /
- 生物浸出 /
- 中度嗜熱菌 /
- 硫形態
Abstract: Leaching processes and sulfur speciation on the surface of pyrite leached by the moderate thermophiles of Sulfobacillus thermosulfidooxidans were investigated by scanning electron microscopy,X-ray diffraction and sulfur K-edge X-ray absorption near edge structure spectroscopy.The results show that Sulfobacillus thermosulfidooxidans can significantly improve the leaching of pyrite and the leaching rate is up to 5.3 g·L^-1 after the process for 24 d.The surface of the mineral is obviously corrupted after leaching for 24 d with microbes and on the surface there are some visible crystalline floccules.Leaching products were found accumulating during the leaching process and the main composition is jarosite.The sulfur K-edge spectra indicates that the sulfur components are composed by pyrite and jarosite,whose mass fractions are 34.8% and 65.2%,respectively.
- pyrite /
- bioleaching /
- moderate thermophiles /
- sulfur speciation