Efficient stabilization of mercury-rich fly ash via mechanochemical method
Efficient stabilization of mercury-rich fly ash via mechanochemical method
复制标题
通过机械化学方法有效稳定富汞飞灰
DOI：
10.1016/j.cej.2022.140264
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发表时间：
2022-11
影响因子：
15.1
通讯作者：
Yufeng Duan
中科院分区：
文献类型：
--
作者：
Xinze Geng;Li Zhong;Xiaoshuo Liu;Xunlei Ding;Tianfang Huang;Yifan Xu;Yufeng Duan
机械化学溴化粉煤灰脱汞剂具有良好的脱汞能力和经济性。然而，这种饱和的脱汞剂在随后的填埋处理过程中存在严重的二次浸出问题。为此，选择MC法对上述富汞粉煤灰中的汞进行稳定化处理，通过毒性特性浸出程序试验进行评价。此外，通过各种表征和DFT计算，详细讨论了汞稳定的机理。结果表明，MC硫化能有效地稳定汞，提高能量的促进作用上级提高稳定剂的促进作用。结果表明，S/Hg摩尔比为5000，球磨时间为60 min是最佳的MC稳定化条件。其稳定机理主要有两个方面，一是增加未燃碳的表面缺陷和羟基，提高了邻位汞的稳定性;另一种是HgBr 2和S8被MC过程活化生成Hg和S4，并自发生成HgS。
The mechanochemical (MC) brominated fly ash demercurizer showed excellent mercury removal capacity and cost-effectiveness. Nevertheless, such saturated demercurizer has serious secondary leaching issues in the subsequent landfill treatment process. Herein, selecting the MC method to stabilize the mercury in the above mercury-rich fly ash, is evaluated by the toxicity characteristic leaching procedure test. Besides, the detailed mechanism of mercury stabilization was explicitly discussed via various characterizations and DFT calculations. The results indicated that mercury can be effectively stabilized by MC sulfurization, specifically, the facilitation of energy exaltation is superior to that of stabilizer exaltation in the performance of mercury stabilization. The optimal cost-effective MC stabilization condition of S/Hg molar ratio of 5000 and milling time of 60 min was obtained. The stabilization mechanism is mainly in two aspects, one is to increase the surface defects and hydroxyl of unburned carbon that improve the stability of vicinal mercury. Another one is that HgBr2and S8are activated by the MC process to generate Hg and S4that are spontaneous to form HgS.
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影响因子：
7.4
作者：
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