Al(OH)_(3)胶体、腐殖酸和碳酸铀酰在饱和多孔介质中的共迁移  

Co-transportation of Al(OH)_(3) Colloids,Humic Acid and Uranyl Carbonate in Saturated Porous Media

作　　者：李惠 王红强[1] 侯伟[1] 胡鄂明[1] 雷治武 王清良[1] LI Hui;WANG Hong-qiang;HOU Wei;HU E-ming;LEI Zhi-wu;WANG Qing-liang(Hunan Key Laboratory of Rare Metal Minerals Exploitation and Geological Disposal of Wastes,School of Resource Environment and Safety Engineering,University of South China,Hengyang 421001,Hunan,China)

机构地区：[1]南华大学资源与环境安全工程学院,稀有金属矿产开发与废物地质处置技术湖南省重点实验室,湖南衡阳421001

出　　处：《矿冶工程》2021年第5期93-98,共6页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(11675072)。

摘　　要：探究了CO_(2)+O_(2)地浸采铀工艺中胶体对铀迁移行为的影响规律。以Al(OH)_(3)胶体、腐殖酸(HA)和碳酸铀酰(UC(Ⅵ))为研究对象,考察了pH=7.6、不同流速下,单一体系(Al(OH)_(3)胶体或UC(Ⅵ))、二元体系(Al(OH)_(3)-UC(Ⅵ))和三元体系(Al(OH)_(3)-UC(Ⅵ)-HA)在饱和石英砂介质中的迁移规律。结果表明,单一迁移体系中,流速更易影响Al(OH)_(3)的迁移效率,且随着流速增大,Al(OH)_(3)和UC(Ⅵ)迁移率显著增加。二元迁移体系中,UC(Ⅵ)和Al(OH)_(3)的迁移在流速5 mL/min时易受抑制,迁移率最小;UC(Ⅵ)和Al(OH)_(3)共存会互相抑制对方的迁移。三元迁移体系中,UC(Ⅵ)和Al(OH)_(3)的迁移基本不受流速影响;HA的存在显著促进了UC(Ⅵ)和Al(OH)_(3)的迁移。本研究为调控改善矿物胶体沉积、提高浸铀效果提供了科学依据。In order to explore the effect of colloid on uranium migration behavior in CO_(2)+O_(2) during in-situ leaching process of uranium,Al(OH)_(3) colloid,humic acid(HA)and uranyl carbonate(UC(Ⅵ))were taken in the research to investigate the transportation of single system(Al(OH)_(3) colloid or UC(Ⅵ)),binary system(Al(OH)_(3)-UC(Ⅵ))and ternary system(Al(OH)_(3)-UC(Ⅵ)-HA)at different flow velocity in saturated quartz sand under the condition of pH 7.6.Results show the transportation efficiency of Al(OH)_(3) in a single transportation system is more likely to be affected by flow rate,and the transportation of Al(OH)_(3) and UC(Ⅵ)increases significantly with the increase of flow rate.In the binary transportation system,the transportation of UC(Ⅵ)and Al(OH)_(3) is prone to be inhibited at the flow rate of 5 mL/min,leading to the minimal mobility,and the co-existence of UC(Ⅵ)and Al(OH)_(3) can inhibit each other′s transportation.In the ternary transportation system,the transportation of UC(Ⅵ)and Al(OH)_(3) is almost unaffected by flow velocity;However,the presence of HA can significantly promote the transportation of UC(Ⅵ)and Al(OH)_(3).This research can provide a scientific basis for improving mineral colloid deposition and the uranium leaching effect.

关 键 词：柱实验 地浸 铀 Al(OH)_(3)胶体 腐殖酸 碳酸铀酰 多孔介质 吸附 共迁移 

分 类 号：X142[环境科学与工程—环境科学]