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Acid bioleaching of select sphalerite samples of variable Zn- and Fe-contents
Hydrometallurgy ( IF 4.7 ) Pub Date : 2022-05-14 , DOI: 10.1016/j.hydromet.2022.105897
Hadi Abdollahi , Mirsaleh Mirmohammadi , Sina Ghassa , Golnaz Jozanikohan , Zohreh Boroumand , Olli H. Tuovinen

Mesophilic bacteria (Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans, and Leptospirillum ferrooxidans) and moderate thermophiles (Acidithiobacillus caldus and Sulfobacillus thermosulfidooxidans) were used in bioleaching experiments with five select sphalerite samples, which varied in the Zn- and Fe-content. Each sample was leached with and without additional Fe2+ and S0 under mesophilic and moderately thermophilic conditions. A sphalerite sample with a high Fe-content (8.95% Fe) reached a higher yield of zinc bioleaching than those with less iron (0.20–2.04% Fe). The maximum Zn recovery in the mesophilic tests was 82%, obtained with the sample of the highest Fe-content. In the moderately thermophilic experiments, the highest Zn recovery was 32%. The mesophiles increased the oxidation reduction potential due to the oxidation of Fe2+. The formation of jarosite-type precipitates and sulfur on sphalerite surfaces in the mesophilic tests and the formation of sulfur in the moderate thermophilic tests were indicated by analysis with powder X-ray diffraction and scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy.



中文翻译:

可变锌和铁含量的选定闪锌矿样品的酸生物浸出

嗜温细菌( Acidithiobacillus ferrooxidans、Acidithiobacillus thiooxidansLeptospirillum ferrooxidans )和中度嗜热菌(Acidithiobacillus caldus和Sulfobacillus thermosulfidooxidans)被用于对 5 个选择的闪锌矿样品进行生物浸出实验,这些样品的锌和铁含量各不相同。每个样品在有或没有额外的 Fe 2+和 S 0的情况下进行浸出在中温和中度嗜热条件下。具有高铁含量(8.95% Fe)的闪锌矿样品比铁含量低(0.20-2.04% Fe)的闪锌矿样品的锌生物浸出率更高。在中温测试中最大的 Zn 回收率为 82%,这是用最高 Fe 含量的样品获得的。在中等嗜热实验中,最高的锌回收率为 32%。由于Fe 2+的氧化,中温物质增加了氧化还原电位。通过粉末 X 射线衍射和配备能量色散 X 射线光谱的扫描电子显微镜分析表明,在中温测试中闪锌矿表面形成黄钾铁矾型沉淀物和硫,在中等嗜热测试中形成硫。

更新日期:2022-05-14
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