原子能科学技术2025，Vol.59Issue(11)：2436-2446,11.DOI:10.7538/yzk.2025.youxian.0053
砂岩铀矿纳微米气泡溶氧浸出特性研究
Study on Leaching Characteristics of Sandstone Uranium Ore Using Nano-microbubble Dissolved Oxygen
陈乡 1王立民 1王亚安 1曹鸣谦 1廖文胜 1霍建党 1原渊 1苏学斌2
作者信息
- 1. 核工业北京化工冶金研究院,北京 101149
- 2. 中核铀业股份有限公司,北京 100013
- 折叠
摘要
Abstract
Based on the gas-liquid interfacial mass transfer dynamics theory,in this paper the bubble dynamic characteristics of conventional oxygenation and nano-microbubble oxygenation systems were comparatively analyzed,as well as their influence mechanisms on sandstone uranium ore leaching processes.The particle size distribution(particle size≤280.4 nm accounting for 50%),surface potential(mean Zeta-16.8 mV),and dissolved oxygen(DO)concentration of the nano-microbubble system were characterized using a particle size analyzer,Zeta potential analyzer,and DO measuring instrument.Significant mass transfer enhancement was observed compared to conventional oxygenation(no bubbles＜50 μm detected,mean ζ=-6.2 mV).Column leaching tests demonstrate that the nano-microbubble group achieves a cumulative uranium leaching efficiency of 50.92%,representing 6.9%improvement over the conventional group,with leaching rates exhibiting distinct stages:growth phase(0-5 d)and steady-state phase(6-15 d).The dynamic analysis results of the shrinkage core model show that the function 1+2(1-α)-3(1-α)2/3 is linearly correlated with leaching time with R²=0.93-0.98,indicating that the leaching process is controlled by solid film diffusion.Notably,the apparent rate constant k2 in the nano-microbubble group reaches 1.11×10-3 h-1 during initial leaching(0-5 d),2.34 times higher than conventional oxygenation(4.74×10-4 h-1).However,in the later stage(6-15 d),the leaching of U is inhibited by iron oxidation products,and the apparent rate constant k2(5.52×10-5 h-1)is lower than that of the conventional system(1.45×10-4 h-1).This research reveals the dual effects of nano-microbubble-enhanced leaching:promoting uranium oxidation dissolution through optimized gas-liquid mass transfer,while concurrently constraining uranium extraction through competitive iron dissolution.These findings provide theoretical foundations and technical parameters for developing green and efficient uranium ore leaching technologies.关键词
纳微米气泡/溶氧/砂岩铀矿/铀/浸出动力学/收缩核Key words
nano-microbuble/dissolved oxygen/sandstone uranium deposit/uranium/leaching kinet-ics/shrinking core分类
能源科技引用本文复制引用
陈乡,王立民,王亚安,曹鸣谦,廖文胜,霍建党,原渊,苏学斌..砂岩铀矿纳微米气泡溶氧浸出特性研究[J].原子能科学技术,2025,59(11):2436-2446,11.
