Volatilization mechanism of Zn on municipal solid waste incineration fly ash during thermal treatment
WANG Ye1,2, LI Na3, TIAN Shu-lei2,4, LI Song2,5, PING Ran2,6, LIU Hong-bo2, ZHOU Xiu-yan3
1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;
2. Institute of Soil and Solid Waste Chinese, Research Academy of Environmental Sciences, Beijing 100012, China;
3. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 0660043, China;
4. School of Environment, Harbin Institute of Technology, Harbin 150001, China;
5. College of Chemical Engineering, Northeast Electric Power University, Changchun 132012, China;
6. School of Environmental Science and Engineering, Hebei University of Science & Technology, Shijiazhuang 050080, China
Under the condition of 650~1350℃, the effect of temperature and time on the volatilization rate of Zn in fly ash was investigated in this experiment. XAFs were used to analyze the morphological and structuralof Zn in fly ash and secondary fly ash. The chlorination reaction pathway of Zn was deduced by using Gibbs free energy theory and the verification test was carried out. The results showed that the temperature was the main factor affecting on the volatilization of Zn. The volatilization trend increased first with temperature and then decreased. The volatilization rate reached the highest at 1000℃, while the time had little effect on its volatilization. Zn was mainly volatilized in the form of chloride, according to the theoretical calculation and verification test of Gibbs free energy theory in each hypothetical reaction pathway, it was concluded that the chlorination reaction of Zn in the heat treatment was carried out in two steps. First, the chloride in the fly ash reacted with SiO2 to form Cl2, and then ZnO reacted with Cl2 to form ZnCl2, while a small part of Cl2 may react with water vapor to form HCl, and then react with ZnO to form ZnCl2.
王野, 李娜, 田书磊, 李松, 平然, 刘宏博, 周秀艳. 垃圾焚烧飞灰热处理过程中Zn的挥发机理研究[J]. 中国环境科学, 2019, 39(2): 706-712.
WANG Ye, LI Na, TIAN Shu-lei, LI Song, PING Ran, LIU Hong-bo, ZHOU Xiu-yan. Volatilization mechanism of Zn on municipal solid waste incineration fly ash during thermal treatment. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(2): 706-712.
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