欢迎访问《金属矿山》杂志官方网站,今天是 分享到:
×

扫码分享

金属矿山 ›› 2007, Vol. 37 ›› Issue (10): 59-63.

• 矿物工程 • 上一篇    下一篇

黄铁矿生物氧化过程的阶段性

蒋磊1,周怀阳2,彭晓彤2   

  1. 1.武汉科技学院;2.中国科学院广州地球化学研究所
  • 出版日期:2007-10-15 发布日期:2012-02-28
  • 基金资助:

    * 国家自然科学基金项目(编号:40403004,40473032)。

Phases in Pyrite Bio-Oxidation Process

Jiang Lei1,Zhou Huaiyang2,Peng Xiaotong2   

  1. 1.Wuhan University of Science & Engineering;2.Guangzhou Institute of Geochemistry, Chinese Academy of Sciences
  • Online:2007-10-15 Published:2012-02-28

摘要: 以氧化亚铁硫杆菌为实验菌株,研究了黄铁矿的Fe3+氧化和生物氧化过程中溶液铁离子浓度、pH值以及Eh值的变化。结果表明,Fe3+由于自身很快会被消耗,因而对黄铁矿的氧化速率较低;而在细菌的作用下,Fe2+可以不断被氧化成Fe3+,从而使黄铁矿的氧化速率明显加快,因此生物氧化具有更高的效率。基于间接作用机制,结合黄铁矿生物氧化过程中pH值及Eh值的变化规律,提出了黄铁矿生物氧化的阶段性特点,即将氧化亚铁硫杆菌对黄铁矿的氧化过程分为黄铁矿无机氧化、Fe2+生物氧化和黄铁矿稳定生物氧化3个阶段。

关键词: 黄铁矿, 氧化亚铁硫杆菌, 生物氧化, 阶段性

Abstract: The change in the iron ion concentration, pH and Eh in the Fe3+ oxidization and bio-oxidation process of pyrite is studied by using Acidithiobacillus ferrooxidans. The results show that as Fe3+ will rapidly be consumed, it has a low oxidation rate for pyrite while the presence of bacteria can continuously oxidize Fe2+ into Fe3+, thus evidently accelerating the pyrite oxidation rate. Therefore, bio-oxidation has higher efficiency. Based on the indirect function mechanism and in light of the change law of pH and Eh in the bio-oxidation process of pyrite, it is suggested that the phase characteristics of pyrite bio-leaching can be divided into three phases, namely, phase I (inorganic oxidation of pyrite), phase II (bio-oxidation of Fe2+) and phase III (equilibrium bio-oxidation of pyrite).

Key words: Pyrite, Acidithiobacillus ferrooxidans, Bio-oxidation, Phase