Partitioning of minerals and elements during preparation of Taixi coal, China
Partitioning of minerals and elements during preparation of Taixi coal, China
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DOI：
10.1016/j.fuel.2005.05.017
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发表时间：
2006
期刊：
影响因子：
7.4
通讯作者：
Wenfeng Wang;Yong Qin;Shuxun Sang;B. Jiang;Yinghai Guo;Yanming Zhu;Xuehai Fu
中科院分区：
文献类型：
--
作者：
Wenfeng Wang;Yong Qin;Shuxun Sang;B. Jiang;Yinghai Guo;Yanming Zhu;Xuehai Fu
对汝箕沟矿区太西煤及其洗煤产品的8个煤样进行了矿物学、硫和40种元素含量的测定。对样品进行了INAA、ICP-AES、CV-AAS、GAAS、XRD、SEM/EDX、常规化学分析和显微组分分析。研究了煤中矿物和元素在选煤过程中的分配行为，探讨了影响元素分配行为的主要因素。粘土矿物（高岭石、伊利石、蒙脱石和方解石）、石英和碳酸盐矿物（方解石、白云石和菱铁矿）在太西煤的矿物学中占主导地位。还有少量的黄铁矿和微量的石膏和长石。石英以后生成因为主，粘土矿物受热变质作用改造。通过清理，它们很容易从煤中分离出来。然而，虽然大多数碳酸盐矿物也主要是后生的起源，其去除程度相对较低，特别是相对于白云石和菱铁矿，这往往是精细分散在煤显微组分，使他们大多保留在清洁煤。大多数研究的元素可以有效地去除在清洗过程中，特别是对于主要托管在粗，后生矿物的元素。与其他粒度的精煤相比，粗粒精煤是最清洁的，具有相对较低的环境风险。大部分潜在的有害元素在煤废料中显著富集，使得该废料不适合用作燃料。选煤过程中元素的分配主要受元素的赋存状态、显微组分类型、矿物的粒度和结构关系以及所采用的选煤工艺等因素的控制。
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.