Leaching of elements from bottom ash, economizer fly ash, and fly ash from two coal-fired power plants
Leaching of elements from bottom ash, economizer fly ash, and fly ash from two coal-fired power plants
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DOI：
10.1016/j.coal.2011.10.007
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发表时间：
2012-05
影响因子：
5.6
通讯作者：
Kevin B. Jones;L. Ruppert;S. M. Swanson
中科院分区：
文献类型：
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作者：
Kevin B. Jones;L. Ruppert;S. M. Swanson
为了评估元素如何从几种类型的煤燃烧产物（CCP）中浸出，并更好地了解CCP使用或处置的可能风险，从两个烟煤发电厂抽取了煤灰样品。位于俄亥俄州的一个工厂燃烧来自阿巴拉契亚盆地中部莫农加希拉群的上宾夕法尼亚匹兹堡煤的高硫（约3.9%）;另一个位于新墨西哥州的工厂燃烧来自科罗拉多高原圣胡安盆地的上白垩纪果地组煤的低硫（约0.76%）。从俄亥俄州电厂取样的CCP为底灰（BA）、节能器飞灰（EFA）和飞灰（FA）;从新墨西哥州电厂取样的CCP为BA、FA/EFA混合物、FA和FA/EFA和FA混合物的旋风分离的粗粒级和细粒级。使用合成地下水沥滤程序（SGLP）或毒性特征沥滤程序（TCLP，18小时持续时间）的长期沥滤（60天持续时间）组件沥滤每种灰分的子样本。这些灰烬都是碱性的。从CCP的元素的渗滤液浓度和渗透率是相似的相应的CCP类型（BA，EFA和FA）从每种植物。大多数元素的可浸出性最低的BA（最难浸出）和增加从EFA到FA（最难浸出）。Ca和Sr从EFA中的浸出量大于BA或FA。大多数元素的浸出性也增加了FA颗粒尺寸减小，可能部分是由于增加比表面积。几个氧阴离子形成元素（砷，钼，硒，U和V）浸出SGLP下比TCLP下，相反的是真实的大多数其他元素分析。
To assess how elements leach from several types of coal combustion products (CCPs) and to better understand possible risks from CCP use or disposal, coal ashes were sampled from two bituminous-coal-fired power plants. One plant located in Ohio burns high-sulfur (about 3.9%) Upper Pennsylvanian Pittsburgh coal from the Monongahela Group of the Central Appalachian Basin; the other in New Mexico burns low-sulfur (about 0.76%) Upper Cretaceous Fruitland Formation coal from the San Juan Basin, Colorado Plateau. The sampled CCPs from the Ohio plant were bottom ash (BA), economizer fly ash (EFA), and fly ash (FA); the sampled CCPs from the New Mexico plant were BA, mixed FA/EFA, FA, and cyclone-separated coarse and fine fractions of a FA/EFA and FA blend. Subsamples of each ash were leached using the long-term leaching (60-day duration) component of the synthetic groundwater leaching procedure (SGLP) or the toxicity characteristic leaching procedure (TCLP, 18-hour duration). These ashes were all alkaline. Leachate concentrations and leachabilities of the elements from the CCPs were similar between corresponding CCP types (BA, EFA, and FA) from each plant. The leachabilities of most elements were lowest in BA (least leachable) and increased from EFA to FA (most leachable). Ca and Sr were leached more from EFA than from either BA or FA. Leachability of most elements also increased as FA particle size decreased, possibly due in part to increasing specific surface areas. Several oxyanion-forming elements (As, Mo, Se, U, and V) leached more under SGLP than under TCLP; the opposite was true for most other elements analyzed.