Abstract: The fluidization-washing experiments of Bayer red mud were conducted using the fluidization apparatus based on the principle of fluidization. The results show that Na2O concentration and mass ratio of liquid to solid in the underflow can reach 0.25~5 g/L and 2.2~2.7, respectively, and Na2O concentration of the overflow is 90~150 g/L, when the Na2O concentration of the red mud slurry is 125~180 g/L and the amount of washing water used is 4.2~4.9 t/t-red mud. A mathematical model was developed based on the principle of fluidization washing, which can predict the washing effect and the axial concentration distribution in the fluidization washing process. The fluidization technology can achieve the washing effect with many advantages

Key words: alumina, red mud, fluidizatio, washing, model

摘要： 利用流态化洗涤装置进行了赤泥浆液的流态化洗涤实验研究. 结果表明，当赤泥浆液中Na2O浓度为125~180 g/L、赤泥用水量为4.2~4.9 t/t时，底流附碱浓度可降低至0.25~5 g/L，底流液固质量比为2.2~2.7，溢流Na2O浓度为90~150 g/L. 基于流态化洗涤原理，建立了流态化洗涤的数学模型，可预测洗涤过程浆液中Na2O浓度轴向分布和洗涤效果. 研究结果表明流态化洗涤装置可用于氧化铝生产的赤泥浆液洗涤.

关键词: 氧化铝, 赤泥, 流态化, 洗涤, 模型