摘要
以粗孔活性硅胶为吸附剂,从含铀含氟废水中吸附铀,分析研究接触时间,pH和氟离子浓度对吸附平衡的影响,并且建立硅胶固定床吸附含铀含氟废水的计算。实验结果表明,对于铀浓度小于50 mg·L^(-1)的含铀废水,接触时间控制为10~15 min即可达到吸附平衡;pH取在8.0~9.0之间在工艺上最有利于铀的硅胶吸附;对于含氟废水,氟离子浓度升高,会降低硅胶对铀的吸附量,当氟含量不超过20 g·L^(-1)时,硅胶的动态饱和容量不小于20.5 mgU/克干硅胶;以NH_3·H_2O-UO_2F_2体系沉淀母液为吸附原液,铀浓度为23.0 mgU·L^(-1)、氟离子浓度为20.0 g·L^(-1)、pH为8.0~9.0,接触时间20 min的条件下,流体相总传质单元数为13。
The adsorption of uranium by the active macro pore silica gel from waste water was studied. Experiments were carried out to investigate the effects of contact time, solution pH and concentration of F- on the uranium sorption equilibration. The calculation of uranium sorption from waste water including F on the fixed-bed is founded. The experimental results shows that the contact time is about 10~ 15 mins when the concentration of uranium is less than 50 mg L^-1. Adjusting pH from 8.0 to 9.0 is more suitable for the uranium adsorption onto silica gel. The uranium adsorption capacity onto silica gel decreases while the concentration of F- increases. The uranium adsorption capacity onto silica gel is not less than 20.5 mg/g dry silica gel As initial aqueous solution, NH3 · H2O-UO2F2 system on the conditions of [U] =23.0mg L^-1 , [F-]=20 g L-1 ,pH=8.0-9.0, 20 mins. contact time the number of transfer units is13.03 through graphic integration.
出处
《核科学与工程》
CSCD
北大核心
2015年第3期574-580,共7页
Nuclear Science and Engineering
关键词
硅胶
铀
废水
吸附
silica gel
uranium
waste water
adsorption
