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针对四氧化三铁(Fe_3O4)在处理含铅废水时因颗粒易团聚沉降、分散稳定性差而导致吸附容量受限的问题，通过流体力学(CFD)模拟研究外加静磁场对Fe_3O4的分散性、悬浮稳定性的强化机制，系统分析磁场方向、强度和空间构型对颗粒分布的影响规律，并结合铅离子(Pb2+)动态吸附实验验证模拟结果。结果表明：磁场方向与重力相反时，可有效提高Fe_3O4颗粒在反应器中的分散性；弱磁场条件下存在最佳的磁场强度，可提升Fe_3O4颗粒在溶液中分布的均匀性，并缓解颗粒的底部堆积现象；相比均匀磁场，本文构建的20 m T-60 mT非均匀磁场可显著提高磁性颗粒分布的均匀性，并有效降低磁性颗粒的底部沉积，在该磁场作用下Fe_3O4对Pb2+的去除率相比无磁场时提升了15%，模拟预测与实验结果吻合良好，证实外加静磁场可有效改善磁性吸附剂的流体动力学行为并提高其吸附性能。
Abstract：To address limited adsorption capacity of Fe?O? resulting from particle agglomeration, sedimentation, and poor dispersion stability during lead-containing wastewater treatment, the enhancement mechanism of an external static magnetic field on Fe_3O4 dispersibility and suspension stability was investigated through computational fluid dynamics(CFD) simulation, the influences of magnetic field direction, strength, and spatial configuration on particle distribution were systematically analyzed, and the simulation results were validated through dynamic lead ion(Pb2+) adsorption experiments. Results showed that: When the magnetic field direction was opposite to gravity, the dispersion of Fe_3O4 particles in the reactor was effectively improved; an optimal magnetic field strength existed under weak magnetic field conditions, which enhanced uniformity of particle distribution and alleviated bottom accumulation. Compared with uniform magnetic fields, the constructed 20 mT-60 mT nonuniform magnetic field significantly improved uniformity of magnetic particle distribution and effectively reduced bottom sedimentation. Under this magnetic field condition, the removal rate of Pb2+ by Fe?O? increased by 15% compared with that without magnetic field, indicating good agreement between simulation predictions and experimental results, and confirming that the external static magnetic field can effectively improve the hydrodynamic behavior of magnetic adsorbents and enhance their adsorption performance.
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基本信息:
中图分类号:TQ424;X703
引用信息:
[1]郭幸斐,刘梓莹,马瑞远,等.磁场强化四氧化三铁吸附铅离子性能的CFD模拟[J].天津工业大学学报().
基金信息:
国家自然科学基金面上项目（22578330）
2026-04-23
2026-04-23
2026-04-23