This study concerns the use of the rotating packed bed (RPB) in the large-scale production of Fe₃O₄ nanopowder using ferrous ions and precipitation. Fe₃O₄ nanopowder was produced at 25 °C with an FeCl₂ concentration of 0.15 mol/L, an NaOH concentration of 0.3 mol/L, a rotational speed of 1800 rpm, and flow rates of aqueous FeCl₂ and NaOH of 0.5 L/min. The rate of large-scale production of Fe₃O₄ nanopowder using ferrous ions in the RPB with precipitation was 7.6 kg/day. The produced Fe₃O₄ nanopowder had a mean crystallite size of 28.4 nm, an average particle size of 34.5 nm, and a BET specific surface area of 32.5 m²/g. The produced Fe₃O₄ nanopowder displayed ferromagnetic behavior with a saturation magnetization of 37 emu/g. The adsorption of Orange G (OG) in water was utilized to assess the adsorption capacity of the produced Fe₃O₄ nanopowder. The maximum adsorption capacity (17.5 mg/g) of the produced Fe₃O₄ nanopowder greatly exceeded that (2.4 mg/g) of Fe₃O₄ nanopowder that was purchased from Alfa Aesar.

本研究涉及旋转填充床 (RPB) 在使用亚铁离子和沉淀法大规模生产 Fe ₃ O ₄纳米粉末中的应用。Fe ₃ O ₄纳米粉体在25 ℃下制备，FeCl _{2浓度为0.15 mol/L，NaOH浓度为0.3 mol/L，转速为1800 rpm，FeCl 2}水溶液和NaOH的流速为0.5 L /分钟。在RPB中使用亚铁离子在沉淀中大规模生产Fe ₃ O _{4纳米粉体的速率为7.6 kg/天。}生成的 Fe ₃ O ₄纳米粉末的平均微晶尺寸为28.4 nm，平均粒径为34.5 nm，BET比表面积为32.5 m ² /g。制备的Fe ₃ O ₄纳米粉末表现出铁磁行为，饱和磁化强度为37 emu/g。利用Orange G (OG)在水中的吸附来评估所产生的Fe ₃ O ₄纳米粉末的吸附能力。_{所生产的Fe 3} O ₄纳米粉末的最大吸附容量（17.5 mg/g）大大超过了从Alfa Aesar 购买的Fe ₃ O _{4纳米粉末的最大吸附容量（2.4 mg/g）。}