湿法冶金2025，Vol.44Issue(6)：759-765,7.DOI:10.13355/j.cnki.sfyj.2025.06.007
流化床氢还原制备铀氧化物固相分布模拟测定研究
Simulation and Measurement of Solid Phase Distribution in Fluidized Bed Hydrogen Reduction for Preparation of Uranium Oxide
申浩楠 1牛玉清 1李大炳 1康绍辉 1康修铭 1叶开凯 1张佳宇1
作者信息
- 1. 核工业北京化工冶金研究院,北京 101149
- 折叠
摘要
Abstract
In order to determine the solid phase distribution law of UO2 particles during the gas-liquid-solid fluidization process,Fluidization behavior of nickel powder(simulating catalyst)and alumina(simulating UO2 product)in a cold model experiment of a magnetic field-assisted gas-liquid-solid three-phase fluidized bed,with a focus on separation characteristics under magnetic field regulation were systematically investigated.The results show that in the absence of a magnetic field,the axial solid content distribution of alumina particles varies significantly with the gas flow rates(5-40 L/min).Under low gas flow rates(5-20 L/min),a high-concentration deposition zone is formed at the bottom of the bed,and the larger the particle size,the more obvious the deposition effect.Under medium and high gas flow rates(25-40 L/min),large bubbles break to enhance axial mixing,but the solid content at the top is still lower than that at the bottom.Nickel powder shows significant differences due to its high-density characteristics.Fine particles(200-300 mesh)require a gas flow rate of ≥15 L/min to achieve quasi-uniform dispersion,while coarse particles(100-200 mesh)remain deposited at the bottom of the bed even when the gas flow rate reaches 40 L/min.After the application of a magnetic field,nickel particles gradually accumulate in the lower part of the bed as the magnetic field intensity increases,forming magnetic agglomerated"apparent large particles"that are stably deposited near the gas distribution plate,while non-magnetic alumina floats up with the liquid flow.Under the same magnetic field the solid content ratio of nickel powder to alumina to increase from top to bottom,but the ratio drops rapidly with the strengthening of the magnetic field,indicating a significant aggregation effect of magnetic particles.The research results verified the dynamic separation efficiency of magnetic field-assisted fluidized beds for magnetic catalysts and non-magnetic products,clarified the key parameters of gas flow rate,magnetic field intensity and particle matching,and provided theoretical support for the design of continuous reactors in uranium chemical industry.关键词
磁化流化床/氢还原/制备/铀氧化物/气-液-固三相/固含率分布Key words
magnetized fluidized bed/hydrogen reduction/preparation/uranium oxide/gas-liquid-solid three-phase/solids concentration distribution分类
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申浩楠,牛玉清,李大炳,康绍辉,康修铭,叶开凯,张佳宇..流化床氢还原制备铀氧化物固相分布模拟测定研究[J].湿法冶金,2025,44(6):759-765,7.
