MODES OF OCCURRENCE OF POTENTIALLY HAZARDOUS ELEMENTS IN COAL - LEVELS OF CONFIDENCE
MODES OF OCCURRENCE OF POTENTIALLY HAZARDOUS ELEMENTS IN COAL - LEVELS OF CONFIDENCE
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DOI：
10.1016/0378-3820(94)90169-4
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发表时间：
1994-08-01
影响因子：
7.5
通讯作者：
FINKELMAN, RB
中科院分区：
文献类型：
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作者：
FINKELMAN, RB
煤中潜在有害元素的赋存状态对减少煤燃烧过程中潜在有害元素的迁移具有重要意义。 锑和硒可能以固溶体形式存在于黄铁矿中，作为分散在整个有机基质中的微小副硫化物，或以有机缔合形式存在。 由于这些发生模式，预计通过传统的煤炭清洁程序将常规去除不到50%的这些元素。 砷和汞主要存在于后期粗粒黄铁矿中，因此，物理选煤程序应能成功地去除这些元素的大部分。 镉存在于闪锌矿中，铅存在于方铅矿中。 这两种矿物都表现出广泛的粒度和结构关系。 根据颗粒大小和结构关系，物理煤炭清洁可以去除这些元素的25%或75%。 烟煤中的锰存在于碳酸盐中，特别是菱铁矿中。 物理洗煤应能去除很大一部分这种元素。 需要更多的信息来阐明铍、铬、钴和镍的存在方式。
The modes of occurrence of the potentially hazardous elements in coal will be of significance in any attempt to reduce their mobilization due to coal combustion. Antimony and selenium may be present in solid solution in pyrite, as minute accessory sulfides dispersed throughout the organic matrix, or in organic association. Because of these modes of occurrence it is anticipated that less than 50% of these elements will be routinely removed by conventional coal cleaning procedures. Arsenic and mercury occur primarily in late-stage coarse-grained pyrite therefore physical coal cleaning procedures should be successful in removing substantial proportions of these elements. Cadmium occurs in sphalerite and lead in galena. Both of these minerals exhibit a wide range of particle sizes and textural relations. Depending on the particle size and textural relations, physical coal cleaning may remove as little as 25% of these elements or as much as 75%. Manganese in bituminous coal occurs in carbonates, especially siderite. Physical coal cleaning should remove a substantial proportion of this element. More information is needed to elucidate the modes of occurrence of beryllium, chromium, cobalt, and nickel.