Fluidized bed flotation involves three phases of gas, liquid and solid, which can be used for the separation of coarse minerals. In this study, a two-dimensional gas–liquid-solid fluidized bed was developed to explore the fluidization characteristics of fluidized bed flotation. The effects of water velocity, air velocity, frother dosage and particle size (Ql, Qg, ρn, Dp) on the average pressure drop (–ΔP) and standard deviation (σΔP) were investigated. As the water velocity increases, the pressure drop initially increases, subsequently decreases and eventually remains constant. Increasing the air velocity will enhance the resistance of the bed to the water flow, resulting in a reduction in the water velocity required by peak pressure drop. Furthermore, the pressure drop is observed to decrease due to an increase in air velocity after reaching complete fluidization. Increasing the particle size has the opposite effect, while variations in frother dosage only influence the peak pressure drop. According to the bubble behavior, the influence of different conditions on the pressure drop fluctuation was analyzed. Increasing the water velocity, the frother dosage and the particle size contribute to a reduction in pressure drop fluctuation, whereas an increase in air velocity has the opposite effect. When the water velocity exceeds 1.2 L/min and the frother dosage exceeds 80 g/t, the pressure drop fluctuation is basically unchanged. Finally, the response surface methodology was used to analyze the interaction among the variables, and a mathematical model of the correlation coefficient was established to predict effects.

中文翻译：

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基于多因素的流化床浮选流化特性研究


流化床浮选涉及气、液、固三相，可用于粗矿物的分离。本研究开发了二维气-液-固流化床，以探究流化床浮选的流化特性。研究了水速、风速、起泡剂用量和粒径 （Ql、Qg、ρn、Dp） 对平均压降 （–ΔP） 和标准偏差 （σΔP） 的影响。随着水流速度的增加，压降最初增加，随后减少，最终保持恒定。增加风速将增强河床对水流的阻力，从而导致峰值压降所需的水速降低。此外，在达到完全流化后，由于空气速度的增加，观察到压降降低。增加颗粒大小会产生相反的效果，而起泡剂剂量的变化只会影响峰值压降。根据气泡行为，分析了不同条件对压降波动的影响。增加水速、起泡剂剂量和粒径有助于减少压降波动，而增加风速则具有相反的效果。当水速超过 1.2 L/min 且起泡器用量超过 80 g/t 时，压降波动基本保持不变。最后，采用响应面法分析变量之间的交互作用，并建立相关系数的数学模型来预测效应。