期刊：
Journal of Radioanalytical and Nuclear Chemistry,2014年299(3):1903-1909 ISSN：0236-5731
通讯作者：
Ding, Dexin
作者机构：
[Ding, Dexin; Li, Guangyue; Hu, Nan; Xin, Xin; Fu, Pingkun] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Li, Le] Univ South China, Sch Publ Hlth, Hengyang 421001, Peoples R China.
通讯机构：
[Ding, Dexin] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
关键词：
Sodium feldspar;U(VI) ion adsorption;Low concentration aqueous solution;Kinetic;Water treatment
摘要：
The raw sodium feldspar (RSF) is activated with the concentrated sulfuric acid solution and the acid activated sodium feldspar (AASF) is obtained. The results obtained from the mercury intrusion method show that the acidification can increase the porosity and the specific surface area. The effects of the initial pH, contact time and ambient temperature on the adsorption of U(VI) ions are investigated in a batch process. The adsorption efficiency amounts to the highest at pH 6 and the adsorption equilibrium is reached in 600 min. The pseudo-second-order model is found to be more suitable for the adsorption process than the pseudo-first-order model and intra-particle model, indicating that the chemical adsorption is the predominant step for the adsorption process. Langmuir model is found to describe the adsorption process better than Freundlich model. This proves that the main form of U(VI) ions attached to RSF and AASF is the monolayer coverage. The thermodynamic parameters prove that the adsorption process is a spontaneous endothermic one. It was also found that acid activated treatment can help increase the adsorption rate and capacity. The results show that RSF and AASF can be used as a novel low cost adsorbent for removal of U(VI) ions from the low concentration aqueous solution.
作者机构：
[丁武; 谭凯旋] School of Nuclear Resources Engineering, University of South China, Hengyang 421001, China;[阳奕汉; 李德; 姚光怀] Tianshan Uranium Corporation, China National Nuclear Corporation, Yining 835000, China
通讯机构：
[Tan, K.] S;School of Nuclear Resources Engineering, University of South China, Hengyang 421001, China
作者机构：
[陈璐] School of Resources and Safety Engineering, Central South University, Changsha, China;[张志军; 陈璐] School of Nuclear Resource Engineering, University of South China, Hengyang, Hunan, China;[臧传伟; 于凤海; 陈璐; 谭云亮; 赵同彬] College of Minging and Safety Engineering, Shandong University of Science and Technology, Qingdao, Shandong, China
通讯机构：
College of Minging and Safety Engineering, Shandong University of Science and Technology, Qingdao, Shandong, China
作者机构：
[李广悦; 扶海鹰; 叶勇军; 丁德馨; 宋键斌; 胡南; 王永东] Key Discipline Lab for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China
通讯机构：
Key Discipline Lab for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
关键词：
铀矿;柱浸;堆浸;数学模型;浸出率
摘要：
针对铀矿堆浸生产中矿堆不同高度上的铀金属浸出存在的延迟现象,采用理论分析和室内柱浸试验研究铀矿浸出试验柱不同高度上铀金属浸出的规律。理论分析将铀矿浸出试验柱沿柱高划分为若干个高度足够小且相等的单元体,使其中单个铀矿石颗粒的浸出符合收缩未反应核扩散控制系统模型,且任意1个单元体内所有铀矿石颗粒反应均匀,不存在延迟现象,进而以1个单元体为目标,根据溶浸剂质量守恒原理,并考虑初始溶浸剂浓度的变化,建立铀矿浸出试验柱不同高度上铀金属浸出的数学模型。采用颗粒半径为2.5 mm 的铀矿石进行串联柱浸试验。然后,采用数学模型对柱浸试验结果进行计算,并将模型计算结果与柱浸试验结果进行比较。研究结果表明:试验柱不同高度上铀金属浸出率存在较大差别,且模型计算值与柱浸试验值具有相同的变化趋势,表明该数学模型能较好地反映铀矿浸出试验柱不同高度上铀金属浸出的延迟规律,可为预测铀矿堆浸不同高度上的浸出率提供重要参考。
通讯机构：
Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China
作者机构：
[王立恒; 钟永明; 范楠彬; 赵娅利; 叶勇军] School of Environment Protection and Safety Engineering, University of South China, Hengyang, China;[叶勇军; 丁德馨] Key Discipline Lab for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China
通讯机构：
School of Environment Protection and Safety Engineering, University of South China, Hengyang, China
作者机构：
[李广悦; 王永东; 扶海鹰; 宋键斌; 胡南; 丁德馨; 叶勇军] Key Discipline Lab for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China
通讯机构：
Key Discipline Lab for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
