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Partitioning of minerals and elements during preparation of Taixi coal, China

机译：台西煤的制备过程中矿物和元素的划分

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摘要

Mineralogy, sulfur and 40 other element contents were determined on eight samples of the Taixi coal and its preparation products from the Rujigou mining district, China. INAA, ICP-AES, CV-AAS, GAAS, XRD, SEM/EDX, conventional chemical and maceral analysis were carried out on the samples. This study is focused on the partitioning behavior of the minerals and elements during the coal cleaning, and the main factors influencing the partitioning behavior of elements were also discussed. The clay minerals (kaolinite, illite, montmorillonite and chlorite), quartz and, to a lesser extent, carbonate minerals (calcite, dolomite and siderite) dominate the mineralogy of Taixi coal. There is also minor amounts of pyrite and trace amounts of gypsum and feldspar. The quartz is dominantly epigenetic in origin, and clay minerals were modified by the thermal metamorphism. They are easily liberated from the coal by cleaning. However, although the majority of carbonate minerals are also mainly epigenetic in origin, its degree of removal is relatively low, especially with respect to dolomite and siderite, which are often finely dispersed in coal macerals, so that they are mostly retained in cleaned coal. Most of the elements studied could be removed effectively during the cleaning processes, especially for the elements predominantly hosted in coarse, epigenetic minerals. Compared with other sized cleaned coals, the coarse-grained cleaned coal is cleanest and has a relatively low potential of environmental risk. The majority of the potentially hazardous elements are notably enriched in the coal waste so that the waste is not feasible to be used as fuel. The partitioning of elements during the coal cleaning processes is essentially controlled by some factors such as the modes of occurrence of elements, maceral type, grain size and textural relation of minerals, and types of cleaning technique used.
机译：在来自中国如吉沟矿区的8份泰西煤及其制备产品的样品中，测定了矿物学，硫和40种其他元素的含量。对样品进行了INAA，ICP-AES，CV-AAS，GAAS，XRD，SEM / EDX，常规化学和化学分析。本研究着重于选煤过程中矿物和元素的分配行为，并探讨了影响元素分配行为的主要因素。泰西煤的矿物学以粘土矿物（高岭石，伊利石，蒙脱石和绿泥石），石英以及少量碳酸盐矿物（方解石，白云石和菱铁矿）为主。也有少量的黄铁矿和痕量的石膏和长石。石英的起源主要为表观成因，而粘土矿物则通过热变质作用而被修饰。通过清洁，它们很容易从煤中释放出来。然而，尽管大多数碳酸盐矿物也主要来自表观成因，但其去除程度相对较低，尤其是对于白云石和菱铁矿，它们通常很好地分散在煤的矿物中，因此它们大部分保留在清洁的煤中。所研究的大多数元素在清洁过程中都可以有效去除，特别是对于主要存在于粗糙的表观成因矿物中的元素而言。与其他尺寸的清洁煤相比，粗粒清洁煤是最清洁的并且具有相对较低的环境风险潜力。大部分潜在的有害元素在煤废料中明显富集，因此这些废料不能用作燃料。洗煤过程中元素的分配基本上受某些因素控制，例如元素的发生方式，黄铁矿类型，晶粒大小和矿物的组织关系以及所使用的清洁技术的类型。

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