Vaněk Aleš, Vejvodová Kateřina, Mihaljevič Martin, Ettler Vojtěch, Trubač Jakub, Vaňková Maria, Teper Leslaw, Cabala Jerzy, Sutkowska Katarzyna, Voegelin Andreas, Göttlicher Jörg, Holubík Ondřej, Vokurková Petra, Pavlů Lenka, Galušková Ivana, Zádorová Tereza
Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 00 Praha 6, Czech Republic.
Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 00 Praha 6, Czech Republic.
J Hazard Mater. 2022 Feb 15;424(Pt A):127325. doi: 10.1016/j.jhazmat.2021.127325. Epub 2021 Sep 24.
In this study, we report combined Tl isotopic and Tl mineralogical and speciation data from a set of Tl-rich sulfide concentrates and technological wastes from hydrometallurgical Zn extraction. We also present the first evaluation of Tl isotopic ratios over a cycle of sulfide processing, from the ore flotation to pyro- and hydrometallurgical stages. The results demonstrate that the prevailing Tl form in all samples is Tl(I), without any preferential incorporation into sulfides or Tl-containing secondary phases, indicating an absence of Tl redox reactions. Although the Tl concentrations varied significantly in the studied samples (~9-280 mg/kg), the overall Tl isotopic variability was small, in the range of -3.1 to -4.4 ± 0.7 (2σ) εTl units. By combining present εTl results with the trends first found for a local roasting plant, it is possible to infer minimum Tl isotopic effects throughout the studied industrial process. As a result, the use of Tl isotopic ratios as a source proxy may be complicated or even impossible in areas with naturally high/extreme Tl background contents. On the other hand, areas with two or more isotopically contrasting Tl sources allow for relatively easy tracing, i.e., in compartments which do not suffer from post-depositional isotopic redistributions.
在本研究中，我们报告了一组来自富铊硫化物精矿和湿法冶金锌提取工艺废料的铊同位素、铊矿物学及形态数据。我们还首次评估了从矿石浮选到火法和湿法冶金阶段的硫化物加工循环中的铊同位素比率。结果表明，所有样品中主要的铊形态为Tl(I)，没有优先掺入硫化物或含铊次生相，这表明不存在铊的氧化还原反应。尽管在所研究的样品中铊浓度变化显著（约9 - 280 mg/kg），但总体铊同位素变异性较小，在 - 3.1至 - 4.4 ± 0.7 (2σ) εTl单位范围内。通过将当前的εTl结果与首次在当地焙烧厂发现的趋势相结合，可以推断出整个研究工业过程中的最小铊同位素效应。因此，在天然铊背景含量高/极端的地区，将铊同位素比率用作源代理可能会很复杂甚至无法实现。另一方面，在具有两种或更多同位素对比铊源的地区，相对容易进行追踪，即在未遭受沉积后同位素再分配的区域。
