Antimony weathering products in mine wastes: A case study in Pezinok (Slovakia)

矿山废物中的锑风化产物：佩齐诺克（斯洛伐克）的案例研究

• 批准号: 98714148
• 负责人: Professor Dr. Juraj Majzlan, Ph.D.
• 金额: --
• 依托单位: Lehrstuhl Allgemeine und Angewandte Mineralogie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/98714148?language=en
• 关键词: Antimony; weathering; products; mine; wastes

Antimony is classified as a priority pollutant; it is known to be toxic and probably also carcinogenic. Nevertheless, little attention is paid to this pollutant in comparison with its geochemical cousin, the element arsenic. At abandoned or active mining sites, the primary Sb minerals (mostly stibnite, Sb2S3) weather to form Sb oxides, Sb-rich hydrous ferric oxide, or to release Sb into the environment. Here I propose a meticulous study of the mineral products of this process by a combination of complementary bulk and micro-analytical techniques. The samples for our study come from two waste impoundments near an abandoned Sb deposit Pezinok in Slovakia. The samples were taken from several boreholes, representing the entire weathering profile of the impoundments, and investigated in a great detail with respect to the speciation and migration of As. In the proposed work, we will determine the bulk mineralogy of the borehole samples by X-ray diffraction and optical microscopy. Selected grains will be then analyzed by an electron microprobe for their chemical composition, micro-diffraction for their crystal structure, and micro-X-ray absorption (at the Sb L,,, edge) for the Sb oxidation state. Suitable bulk samples will also be studied; these are hydrous ferric oxide materials with up to 28.3 wt% As2O5 and 2.7 wt% Sb. We will perform bulk X-ray absorption (XAS) experiments at the Sb K edge to determine the local environment of Sb in these samples. Of particular interest is the association or competition of As and Sb for adsorption sites when they occur simultaneously in large amounts. To complement the XAS experiments and to improve the information on Sb speciation, we will also attempt to carry out bulk 121Sb Mössbauer experiments. In conclusion of the project, we will hold a complete data set on the chemical composition, crystal structure (or lack thereof) of the most important Sb weathering products and the chemical state of Sb within them. Such information is currently missing because the existing studies did not use all techniques simultaneously or they focused on the speciation of Sb from a geochemical point of view (e.g., by sequential extractions).

锑被归类为优先污染物；众所周知，它可能是有毒的，也可能是致癌性的。然而，与其地球化学表弟（元素砷）相比，对这种污染物的关注很少。在废弃或活跃的采矿地点，主要的SB矿物质（主要是Stibnite，SB2S3）天气形成SB氧化物，富含SB的含水氧化物或将SB释放到环境中。在这里，我通过互补的体积和微分析技术的结合，提出了对该过程的矿物产品的细致研究。我们研究的样本来自斯洛伐克的一个废弃的SB沉积物Pezinok附近的两种废物施加。样品取自几个钻孔，代表阳ot的整个风化概况，并在AS的规范和迁移方面进行了详细的研究。在拟议的工作中，我们将通过X射线衍射和光学显微镜来确定钻孔样品的大量矿物学。然后，将通过电子微探针分析选定的晶粒，以分析其化学成分，其晶体结构的微分合和SB氧化态的微差分（在SB L，Edge）中的微差分（在SB L，Edge）中。合适的散装样品也将研究；这些是含水氧化物材料，高达28.3 wt％AS2O5和2.7 wt％SB。我们将在SB K边缘执行批量X射线抽象（XAS）实验，以确定这些样品中SB的局部环境。特别值得关注的是AS和SB的关联或竞争，即增加大量出现的吸附位点。为了完成XAS实验并改善有关SB规范的信息，我们还将尝试进行批量121SBMössbauer实验。在该项目结束时，我们将拥有有关最重要的SB风化产品的化学成分，晶体结构（或缺乏晶体结构）的完整数据集和其中SB的化学状态。目前缺少此类信息，因为现有研究并未仅使用所有技术，也没有从地球化学的角度（例如，通过顺序提取）从地球化学的角度使用SB的规范。

项目成果

A mineralogical, geochemical, and microbiogical assessment of the antimony- and arsenic-rich neutral mine drainage tailings near Pezinok, Slovakia

• DOI: 10.2138/am.2011.3556
• 发表时间: 2011
• 期刊: American Mineralogist
• 影响因子: 3.1
• 作者: J. Majzlan;Bronislava Lalinská;M. Chovan;U. Bläß;B. Brecht;J. Göttlicher;R. Steininger;K. Hug