Abstract
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 HgBr2 and S8 are activated by the MC process to generate Hg and S4 that are spontaneous to form HgS.
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