Optimization of gas parameters in a three-phase fluidized bed flotation column

Liu, Taishan; Li, Yanfeng; He, Shengrong; Chen, Peng; Li, Zhengyong

doi:10.1016/j.powtec.2020.06.058

Cited by 10 publications

(4 citation statements)

References 33 publications

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“…The five main steps of the original picture procession by MATLAB image software: The threshold value for a given image is calculated by the automatic threshold value segmentation, such as “m” for the mean and σ for the variance, and then the threshold value is m + 2σ. These are black zones that are caused by light reflection or hollowness in the bubbles in segmented pictures, and the morphological operation was applied to do seven closed operations on the bubbles to repair and fill them. The bubbles fused with the boundary were found at the joint regions, and the overlapped bubbles and the individual bubbles were distinguished by the areas or shapes of the bubbles. Ellipse detection was performed by using the Hough transform, and the threshold value of the Hough transform was set to detect individual bubbles. Detected the long and short axis of each bubble in consecutive frames of the image. As shown in Figure 3, no less than 1000 bubbles have been analyzed under each working condition, and the equivalent diameter d i of the bubbles can be obtained by Equation ():

d_{i} goodbreak= 2 \sqrt[3]{a^{2} b}

where a is the semimajor axis of the bubble and b is the semiminor axis of the bubble. Referred to Liu et al, 3 the Sauter mean diameter ( d 32 ) was utilized to characterize the average diameter of the bubble group, as shown in Equation ():

d_{32} goodbreak= \frac{\sum_{i = 1}^{n} d_{i}^{3}}{\sum_{i = 1}^{n} d_{i}^{2}}

E goodbreak= \frac{b}{a}

where E is the aspect ratio of the bubble. Equation () d 32 represents the Sauter mean diameter of the bubble group, and n is the number of bubbles.…”

Section: Methodsmentioning

confidence: 99%

“…where a is the semimajor axis of the bubble and b is the semiminor axis of the bubble. Referred to Liu et al, 3 the Sauter mean diameter (d 32 ) was utilized to characterize the average diameter of the bubble group, as shown in Equation ( 2):…”

Section: Image Processing and Data Extractionmentioning

confidence: 99%

“…Flotation technology has been widely applied in solid particle separation 1,2 . Bubbles have core effects on flotation performance, and their properties have a significant impact on the flotation effect 3 . Considering the importance of bubbles in flotation, it has been a hot topic in flotation research for a long time 4–7 .…”

Section: Introductionmentioning

confidence: 99%

“…1,2 Bubbles have core effects on flotation performance, and their properties have a significant impact on the flotation effect. 3 Considering the importance of bubbles in flotation, it has been a hot topic in flotation research for a long time. [4][5][6][7] At present, it is generally believed that the hydrodynamics in the flotation is determined by the three "bubble scale" parameters, namely, bubble sizes, gas holdup, and liquid shapes.…”

Section: Introductionmentioning

confidence: 99%

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A study of bubble size/shape evolution in microbubble countercurrent contacting flotation column

Han

Chen

2022

Asia-Pacific J Chem Eng

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Cationic collectors are widely used in the flotation of iron ore, silicate, oxides, and so forth. At this stage, so much research has been carried out on flotation column cells, but more attention needs to be paid to the hydrodynamic properties in the presence of cationic collectors in cells. In order to study foaming performance and hydrodynamic characteristics in the presence of GE609, the bubble characteristics are studied in an experimental scale flotation column. A high-speed camera recorder is used to take bubbles' images, and the bubble size and shape under different conditions is measured by image analysis. This paper aims to explore the effect of dispersed gas and continuous liquid velocities on the bubble size and aspect ratio at different axial heights in a countercurrent flotation column in the presence and absence of GE609. In the

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d_{i} goodbreak= 2 \sqrt[3]{a^{2} b}

d_{32} goodbreak= \frac{\sum_{i = 1}^{n} d_{i}^{3}}{\sum_{i = 1}^{n} d_{i}^{2}}

E goodbreak= \frac{b}{a}

where E is the aspect ratio of the bubble. Equation () d 32 represents the Sauter mean diameter of the bubble group, and n is the number of bubbles.…”

Section: Methodsmentioning

confidence: 99%

Section: Image Processing and Data Extractionmentioning

confidence: 99%