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首页> 外文会议>International conference acid rock drainage >A Method to Separate Phases of Sulfur in Mine-Waste Piles and Natural Alteration Zones, and to Use Sulfur Isotopic Compositions to Investigate Release of Metals and Acidity to the Environment
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A Method to Separate Phases of Sulfur in Mine-Waste Piles and Natural Alteration Zones, and to Use Sulfur Isotopic Compositions to Investigate Release of Metals and Acidity to the Environment

机译：在矿井废物桩和天然改变区中分离硫相的方法，并使用硫同位素组合物研究金属和酸度对环境的释放

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Assessment of metal mobility, acid rock drainage production, and toxic effects from weathering of mineralised materials (ie mine-waste piles and outcropping alteration/ore zones) is key in evaluating and mitigating metal mining sites. Many metal- and acid-generating materials at these sites are sulfur minerals (sulfides to sulfates) with differing reactivities, weathering characteristics and metal contents. Our working hypothesis predicts that data on the types and quantities of sulfur minerals, coupled with comparison of their sulfur isotopic compositions to that of aqueous sulfate in the surrounding environment, can be used to evaluate primary pathways of weathering reactions at mining sites. We developed a sequential extraction scheme to separate the phases of sulfur in mineralised materials. Operationally defined phases, including monosulfides, disulfides, elemental sulfur, water-soluble sulfo-salts, acid-soluble sulfates, and resistant sulfate phases such as barite, are quantified gravimetrically and/or instrumentally. Several sets of experiments were designed to test the effectiveness of this extraction scheme. First, a variety of ore sulfides diluted in an inert matrix was analysed with the scheme. Results showed that molybdenite and arsenic-bearing sulfides do not behave as predicted from just their sulfur oxidation states, indicating that samples containing these minerals need special treatment for complete phase recovery. Second, a natural mine-waste composite standard was analysed by the scheme. The sum of the phases was equal to the total sulfur concentration analysed independently. Each phase had a similar, but distinct sulfur isotopic composition. The results were verified with a laboratory prepared ‘proxy’ having the same mineralogical composition as the standard, but with each phase having a very different sulfur isotopic composition. The sulfur isotopic compositions of the recovered phases from the ‘proxy’ showed that the scheme effectively separated the sulfur with only minor cross contamination of phases. The speciation and isotopic analyses were applied to both mine-waste piles and naturally occurring alteration zones at nine mine sites. A case study from one site comparing the sulfur isotopic composition of minerals in an alteration zone and dissolved sulfate in proximal streams is presented. This case study shows the application of our data to differentiating sources of sulfate in the surrounding environment.
机译：从矿化材料的风化（即矿井废物桩和外包矿床）的耐候物质评估金属迁移率，酸岩排水产生和毒性作用是评估和减轻金属采矿位点的关键。这些位点的许多金属和酸产生材料是硫矿物（硫化硫酸盐），其具有不同的反应性，耐候性和金属含量。我们的工作假设预测了关于硫矿物类型和量的数据，与其硫同位素组合物与周围环境中硫酸硫酸盐的比较相结合，可用于评估采矿位点的风化反应的原发性途径。我们开发了一种序贯提取方案，以分离矿化材料中的硫相。可操作地定义的相，包括金属硫化物，二硫化物，元素硫，水溶性磺酸盐，酸溶硫酸盐和耐药硫酸盐相如解，以重量分析和/或乐气定量。设计了几套实验以测试该提取方案的有效性。首先，用该方案分析在惰性基质中稀释的各种矿硫化物。结果表明，钼酸钼和砷硫化物不如硫氧化态所预测的，表明含有这些矿物质的样品需要特殊处理以完成阶段回收。其次，方案分析了一种天然矿井废物复合标准。阶段的总和等于独立分析的硫浓度。每相具有相似但不同的硫同位素组合物。用实验室制备的“代理”验证了结果，其具有与标准相同的矿物学组合物，但每相具有非常不同的硫同位素组合物。从“代理”中回收的阶段的硫同位素组合物表明，该方案仅将硫与阶段的轻微污染有效地分离。将物种和同位素分析应用于矿井废物桩和九个矿位点的天然发生的改变区。介绍了一个位点的案例研究比较改变区中矿物质的硫同位素组合物并在近端流中溶解硫酸盐。本案例研究表明，我们的数据在周围环境中的硫酸盐源的应用。

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