摘要
为揭示从含氰土壤中浸取氰化物的动力学特征,对碱性溶液浸取土壤中氰化物进行研究,考察浸取固液比、搅拌强度、浸取温度和土壤粒径对氰化物浸取效果的影响,并根据不同的动力学模型进一步探究浸取机理。结果表明:随着浸取温度升高、土壤粒径减小,氰化物浸取分数增大;氰化物浸取过程较好地符合"收缩未反应芯模型"中的内扩散控制模型,浸取过程遵循动力学模型1-2/3α-(1-α)^2/3=Kt,浸取活化能为34 400 J/mol,据此建立的氰化物浸取经验方程为1-2/3α-(1-α)^2/3=7.6×10^4·r^-1·e^-34 400/RT·t.
In order to reveal the kinetic characteristics of cyanide leaching from cyanide contaminated soil,leaching of cyanide in soil was conducted with alkaline solution.The effect of solid-liquid ratio,stirring intensity,temperature and soil particle size on cyanide leaching process was investigated,and the leaching mechanism was further studied according to different kinetic models.The result shows that with higher temperature or smaller soil particle size,the cyanide leaching fraction was increased.The cyanide leaching process was in good agreement with the internal diffusion control model in shrinkingcore model.The leaching process follows the kinetic model 1-2/3α-(1-α)^2/3=Kt,and the leaching activation energy was about 34.4 kJ/mol.Based on that,the empirical equation of cyanide leaching was established as:1-2/3α-(1-α)^2/3=7.6×10^4·r^-1·e^-34 400/RT·t.
作者
杨宗政
杨婷婷
曹晓乐
曹井国
邱沙
陈志国
YANG Zongzheng;YANG Tingting;CAO Xiaole;CAO Jingguo;QIU Sha;CHEN Zhiguo(College of Chemical Engineering and Materials Science,Tianjin University of Science&Technology,Tianjin 300457,China;Tianjin Huakan Environmental Protection Technology Co.,Ltd.,Tianjin North China Geological Exploration Bureau,Tianjin 300170,China)
出处
《天津科技大学学报》
CAS
2020年第2期45-50,56,共7页
Journal of Tianjin University of Science & Technology
基金
天津华北地质勘查局2016年科技支撑项目(HK2016-B5)
国家级大学生创新创业训练计划资助项目(201810057012)。
关键词
氰化物
污染土壤
浸取
动力学
温度
粒径
cyanide
contaminated soil
leaching
kinetics
temperature
particle size
