Engineering Research Center of None-food Biomass Efficient Pyrolysis and Utilization Technology of Guangdong Higher Education Institutes, Dongguan University of Technology, Dongguan, 523808, China.
Engineering Research Center of None-food Biomass Efficient Pyrolysis and Utilization Technology of Guangdong Higher Education Institutes, Dongguan University of Technology, Dongguan, 523808, China; School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
Environ Pollut. 2020 Nov;266(Pt 3):115420. doi: 10.1016/j.envpol.2020.115420. Epub 2020 Aug 14.
In this study, the detoxification mechanisms of water-soluble fluorine in the bottom ash and the distribution of fluorine during the spent potlining (SPL) incineration were characterized in response to four calcium compounds using an experimental tube furnace. CaSiO, CaO, Ca(OH), and CaCO-assisted SPL incineration converted NaF to low toxicity compounds in the bottom ash yielding a conversion range of 54.24-99.45% relative to the individual SPL incineration. The two main mechanisms of the fluorine transformation were the formations of CaF and CaSiOF. The fluorine transformation efficiency was greater with CaSiO than CaO, Ca(OH), and CaCO. Our simulations demonstrated that SiO enhanced the conversion of NaF. The fluorine leaching content of the bottom ash was estimated at 13.71 mg⋅L after the SPL co-incineration with CaSiO (Ca:F = 1.2:1). The acid-alkali solutions had no significant effect on the fluorine leaching content of the bottom ash when 3 ≤ pH ≤ 12. Fluorine during the SPL co-incineration with CaSiO (Ca:F = 1.2:1) at 850 °C for 60 min was partitioned into 83.37, 13.90, and 2.72% in the bottom ash, fly ash, and flue gas, respectively. The transformation and detoxification mechanisms of water-soluble fluorine provide new insights into controls on fluorine emission from the SPL incineration.
在这项研究中，使用实验管式炉，针对四种钙化合物，研究了底灰中水溶性氟的解毒机制以及在废旧浸渍罐（SPL）焚烧过程中氟的分布。CaSiO、CaO、Ca(OH)和 CaCO 辅助的 SPL 焚烧将 NaF 转化为底灰中低毒性化合物，相对于单独的 SPL 焚烧，转化率范围为 54.24-99.45%。氟转化的两个主要机制是 CaF 和 CaSiOF 的形成。与 CaO、Ca(OH)和 CaCO 相比，CaSiO 的氟转化效率更高。我们的模拟表明，SiO 增强了 NaF 的转化。当 SPL 与 CaSiO 共焚烧（Ca:F=1.2:1）时，底灰中的氟浸出含量估计为 13.71 mg⋅L。当 3≤pH≤12 时，酸碱溶液对底灰中的氟浸出含量没有显著影响。当 SPL 与 CaSiO 在 850°C 下共焚烧 60 分钟（Ca:F=1.2:1）时，氟分别以 83.37%、13.90%和 2.72%的比例分配到底灰、飞灰和烟道气中。水溶性氟的转化和解毒机制为控制 SPL 焚烧过程中的氟排放提供了新的见解。
