论文部分内容阅读
毒砂是常见的含砷硫化物矿物。在金属硫化物矿山环境中,含毒砂矿石和尾矿的风化会导致严重的重金属污染,在其风化过程中,微生物能够显著促进毒砂的氧化分解。本文实验研究了Acidithiobacillus ferrooxidans氧化分解毒砂矿物的现象,利用X射线衍射和扫描电子显微镜,分析了毒砂微生物氧化作用形成的次生矿物类型,发现毒砂表面存在As含量明显不同的2类次生产物,观察到黄钾铁矾、臭葱石、自然硫和施威特曼石等矿物;借助光电子能谱仪重点分析了微生物作用前后毒砂晶面的表面化学组成,基本查明了Fe、As和S三种元素的价态变化,初步探讨了毒砂表面次生矿物成因和As的化学态转化。
Arsenopyrite is a common arsenic sulfide mineral. In the metal sulphide mine environment, the weathering of toxic sands and tailings can lead to severe heavy metal pollution. During the weathering process, microorganisms can significantly promote the oxidative decomposition of arsenopyrite. In this paper, the oxidative decomposition of arsenopyrite minerals by Acidithiobacillus ferrooxidans was studied in this paper. The secondary mineral types formed by the oxidation of arsenopyrite were analyzed by X-ray diffraction and scanning electron microscopy. It was found that there were 2 types The products were observed and the minerals such as jarosite, scorodite, natural sulfur and schwertmannite were observed. By means of photoelectron spectroscopy, the chemical composition of the surface of virgin sand before and after microbe was analyzed, As and S elements of the valence changes, a preliminary discussion of the formation of arsenopyrite secondary minerals and As of the chemical state of the transformation.