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首页> 外文期刊>Applied Geochemistry: Journal of the International Association of Geochemistry and Cosmochemistry >Leaching behavior of fly ash from co-firing of coal with alternative off gas fuel in powerplant boilers
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Leaching behavior of fly ash from co-firing of coal with alternative off gas fuel in powerplant boilers

机译：粉煤灰从煤炭共同射击的浸出行为

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The attenuation of climate changes through substitution of coal with GHG-neutral or low-emission fuels, a replacement of non-renewable resources with renewable ones and reuse of waste materials is being achieved among others by partial or total substitution of coal in power plants with alternative fuels that may affect the composition and leaching behavior of coal fly ash (CFA), and therefore its environmental impact in disposal/ reuse sites. A comparison of the most widespread primary alkaline Class F CFA of Sialic type from coal combustion with fly ash from co-combustion of the same coal with process off gas in powerplant boilers (CGFA - coal/gas fly ash) revealed certain reduction of pH, CaO, MgO and Fe2O3, and simultaneous increase of other major and minor constituents, but in particular of almost all trace element contents (by 35% - 2-fold). However, comparative tests of the leaching behavior of both materials as a function of L/S (Liquid/Solid ratio) and extract pH with the use of recently developed US EPA, SW-846 Methods 1316 and 1313 (2012) showed that the mobility of both major and trace elements in both residuals (apart from their properties as cations, oxyanions and amphoteric species) was governed by several factors, among them availability and equilibria constraints, and followed predominantly a similar pattern. Liquid-solid partitioning as a function of L/S showed higher release of Ca, OH, As, Ba, Br, I, Co, Ni, Sb, Pb and W from CFA, and of Al, Na, K, SO4, Si, B, Cd, Cr, Hg, Li, Mo, Ti and V from CGFA, Se and Sr showed similar leachability, while Ag, Be, Cu, Fe, Mg, Mn, Tl, Zn, Zr were equally immobile. The decisive factor in element release from CFA and CGFA as a function of pH was the pattern of acid/base neutralization capacity (ANC/BNC) of both materials that in CFA and CGFA appeared to be basically different. Due to the gradual reduction of ANC in CGFA opposite to its sharp depletion in CFA, the majority of elements unstable at acidic pH (Ag, Al,
机译：通过煤炭与温室气体或低排放燃料的煤气变化的衰减，通过在发电厂中的煤炭部分或全面替代煤炭的替代与可再生能源和废料重用废料的不可再生资源可能影响煤粉灰（CFA）组成和浸出行为的替代燃料，从而影响处理/再利用位点的环境影响。从煤燃烧中与粉煤灰的煤燃烧中最广泛的初级碱性F CFA的比较与动力锅炉（CGFA - 煤/煤气粉煤灰）的加工煤中的煤烟片中的煤烟片（CGFA - 煤/煤气粉煤灰）透露了一定减少了pH值， CaO，MgO和Fe2O3，同时增加其他主要和次要成分，但特别是几乎所有痕量元素内容物（35％ - 2倍）。然而，用最近开发的美国EPA，SW-846方法1316和1313（2012）的函数与L / S（液体/实心比）和提取物pH的函数的浸出行为的比较试验表明移动性两个残留物中的主要和微量元素（除了阳离子，氧气和两性物质之外）受几种因素的管辖，其中包括可用性和均衡限制，并遵循类似的模式。作为L / S的函数的液体固体分配显示CA，OH，AS，Ba，Br，I，Co，Ni，Sb，Pb和W的更高释放，CFA，以及Al，Na，K，SO4，Si来自CGFA，SE和Sr的B，Cd，Cr，Hg，Li，Mo，Ti和V显示出类似的可浸出性，而Ag，Ag，Cu，Fe，Mg，Mn，T1，Zn，Zr同样不动。 CFA和CGFA作为pH的函数的元素释放的决定性因素是CFA和CGFA中的两种材料的酸/碱中和能力（ANC / BNC）的模式似乎基本不同。由于CGFA在CGFA中逐渐减少了CFA的急剧耗尽，大部分元素在酸性pH下不稳定（Ag，Al，

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