Abstract The trace elements (TEs) in coal are of great concern due to their toxicity and bioavailability. The coal, bottom ash, fly ash and gaseous species were sampled to study the partitioning and environmental behaviors of TEs during coal combustion. The mineral and phase characterizations of coal combustion residue were determined by X-ray powder diffraction (XRD) and fourier transform infrared spectroscopy (FTIR), respectively. The gaseous emission, risk assessment code and leaching experiment EN 12457 Part 2 procedure were employed to assess the potential environmental impacts. The concentrations of TEs in all the collected samples were determined by inductively coupled plasma mass spectrometry (ICP-MS). During combustion, the mineral compositions of coal (kaolinite, quartz, illite, pyrite and calcite) were changed to mullite, quartz, hematite, lime, magnetite and anhydrite. Arsenic, Cd, Cu, Pb and Zn were emitted mainly in fly ash and gaseous phases. In the current unconfined deposits, the TEs (As, Cu, Pb and Zn) in bottom ash and fly ash may pose a medium risk to the environment. High regularization and management countermeasures including immobilization/stabilization, re-utilization of combustion ash, and controlled disposal should be conducted to eliminate/minimize environmental and ecological risks in coal activities areas.

中文翻译：

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某燃煤电厂微量元素分配及环境特征——以淮北为例

摘要 煤中的微量元素（TEs）因其毒性和生物利用度而备受关注。对煤、底灰、飞灰和气态物种进行采样，以研究煤燃烧过程中 TE 的分配和环境行为。煤燃烧残渣的矿物和物相表征分别通过 X 射线粉末衍射 (XRD) 和傅立叶变换红外光谱 (FTIR) 进行测定。采用气体排放、风险评估规范和浸出实验 EN 12457 第 2 部分程序来评估潜在的环境影响。通过电感耦合等离子体质谱法 (ICP-MS) 确定所有收集样品中 TE 的浓度。在燃烧过程中，煤的矿物成分（高岭石、石英、伊利石、黄铁矿和方解石）转变为莫来石、石英、赤铁矿、石灰、磁铁矿和硬石膏。砷、镉、铜、铅和锌主要以飞灰和气相形式排放。在目前的无封闭矿床中，底灰和飞灰中的 TEs（As、Cu、Pb 和 Zn）可能对环境造成中等风险。采取固定化/稳定化、燃烧灰再利用、控制处置等高度规范化和管理对策，消除/降低煤炭活动区的环境生态风险。