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连续化学提取常用于煤中元素赋存形态的研究,掌握煤中元素的形态分布能进一步了解元素的环境化学机理,为元素的调查和利用提供更多的定量信息。利用改进的连续化学提取方法研究了褐煤中锗元素的存在形态,连续提取步骤为:1)水溶态;2)可交换态;3)碳酸盐和表面氧化物结合态;4)有机物和硫化物结合态;5)残渣态。结果表明应用5步连续化学提取的方法可以有效地定量研究褐煤中金属元素的形态分布。计算了连续提取过程中每一步骤的提取率和可提形态百分比,并据此讨论了褐煤中锗的形态分布。
Continuous chemical extraction is commonly used in the study of the occurrence patterns of elements in coal. Grasping the morphological distribution of elements in coal can further understand the environmental chemical mechanism of elements and provide more quantitative information for the investigation and utilization of elements. The continuous extraction method was used to study the existence of germanium in lignite. The continuous extraction steps were as follows: 1) water-soluble state; 2) exchangeable state; 3) the combination of carbonate and surface oxide; 4) Physical state; 5) Residue state. The results show that the five-step continuous chemical extraction method can be used to quantitatively study the morphological distribution of metallic elements in lignite. The extraction rate and percentage of extractable form of each step in continuous extraction were calculated, and the morphological distribution of germanium in lignite was discussed.