摘要
对铅、镉2种重金属的氧化物开展了热重实验、熟料煅烧以及熟料消解实验,以重金属的挥发率为主要指标,研究了水泥窑协同处置过程中铅、镉在等温条件下随时间的挥发特性。结果表明,2种重金属的挥发率均是随温度的升高,时间的增加而增大。Pb的挥发率为96%,Cd的挥发率达到98%,根据等温动力学及阿累尼乌斯方程,对Pb,Cd的挥发率随时间变化的规律进行动力学模拟,得到较好的线性拟合效果,其中,Pb挥发反应的表观活化能E为88.73 kJ/mol,Cd挥发反应可以分2个部分:1 200℃以下的表观活化能E为61 kJ/mol;1 250℃以上的表观活化能E为184.6 kJ/mol。
In this study, lead and cadmium oxide reagents were added to the cement raw meal to produce clinkers. The volatile rates of lead and cadmium were considered as the main index. In order to investigate the volatile characteristics of these two heavy metals related to time under isothermal conditions during co-processing in cement kilns, thermogravimetric analysis, clinker sintering and clinker digestion were conducted. The results indicate that the volatile rates of Pb and Cd both increase with increasing of temperature and time. The volatile rate of Pb is 96% , and Cd is 98%. According to the kinetics of isothermal and Arrhenius equation, the dynamic simulation was utilized to describe the relation between volatile rate and time. The apparent kinetic activation energy of Pb is 88.73 kJ/mol, and the volatile reaction of Cd can be divided into two parts ： the apparent activation energy is 61 kJ/mol below 1 200℃ and 184.6 kJ/mol above 1 250℃.
出处
《环境工程学报》
CAS
CSCD
北大核心
2013年第12期5001-5006,共6页
Chinese Journal of Environmental Engineering
基金
环保公益性行业科研专项(201209023)
中挪合作项目(CHN215009/059)
