Studies on impeller type, impeller speed and air flow rate in an industrial scale flotation cell — Part 1: Effect on bubble size distribution

1995 ◽  
Vol 8 (6) ◽  
pp. 615-635 ◽  
Author(s):  
B.K Gorain ◽  
J.-P Franzidis ◽  
E.V Manlapig
Keyword(s):  
Size Distribution ◽  
Flow Rate ◽  
Bubble Size ◽  
Air Flow ◽  
Bubble Size Distribution ◽  
Industrial Scale ◽  
Impeller Speed ◽  
Air Flow Rate ◽  
Flotation Cell ◽  
Impeller Type

New Approach to Quartz Coarse Particles Flotation Using Nanobubbles, with Emphasis on the Bubble Size Distribution

2019 ◽  
Vol 19 (01) ◽  
pp. 1850048
Author(s):  
Sabereh Nazari ◽  
Sied Ziaedin Shafaei ◽  
Mahdi Gharabaghi ◽  
Rahman Ahmadi ◽  
Behzad Shahbazi ◽  
...  
Keyword(s):  
Size Distribution ◽  
Flow Rate ◽  
Bubble Size ◽  
Air Flow ◽  
Bubble Size Distribution ◽  
Impeller Speed ◽  
Coarse Particles ◽  
Air Flow Rate ◽  
Operational Parameters ◽  
Flotation Process

This study investigates the influence of bubble size distribution and operational parameters on the flotation behavior of quartz coarse particles. The parameters evaluated during this study include the different bubble size distribution, air flow rate and impeller speed. Experiments were conducted at three different bubble sizes: 110, 171 and 293[Formula: see text]nm as db(32). Then, the results were compared with common air bubbles of the conventional flotation process. The bubble size distribution was measured using a laser particle size analyzer (LPSA). Results showed that the recovery of [Formula: see text]m particles increased in presence of nano bubbles (NBs) up to 25% compared to the conventional flotation. The maximum recovery of 95.59% was obtained using NBs size of 171[Formula: see text]nm at the impeller speed of 900[Formula: see text]rpm and air flow rate of 30[Formula: see text]l/h. It was also indicated that NBs caused an increasing in flotation recovery for all the samples in any size ranges in comparison with the conventional method.

Air Bubble Size Measurement in a Laboratory Flotation Cell

2014 ◽  
Vol 530-531 ◽  
pp. 160-165
Author(s):  
Xiao Feng Xie ◽  
Rong Gang Li
Keyword(s):  
Porous Media ◽  
Image Analysis ◽  
Flow Rate ◽  
Bubble Size ◽  
Air Flow ◽  
Bubble Surface ◽  
Gas Holdup ◽  
Air Flow Rate ◽  
Air Bubble ◽  
Flotation Cell

Air bubble size distribution in a laboratory flotation cell was investigated by using of image analysis technology in this paper. Results showed that it was feasible to determine the air bubble size according to image analysis software. For a porous media-aerated flotation cell, bubble size was dependent on poles size of porous media. Furthermore, operating parameters of the cell could affect the size. Mean bubble diameters increased with increasing of air flow rate. In contrast, it decreased when adding deinking agent. Its decreasing with increasing pulp flow rate under given conditions illustrated the fact that proper turbulence strength at the inlet of air bubbles was favorable for reducing bubble size. Gas holdup increased with increasing air flow rate to some extent, but it had a peak value. Gas holdup would rise obviously when deinking agent existed. An efficient approach to enhancing bubble surface area flux was to increase air flow rate and keep small bubble size at the same time.

scholarly journals Influence of the Gas Bubble Size Distribution on the Ladle Stirring Process

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1663
Author(s):  
Mengkun Li ◽  
Lintao Zhang
Keyword(s):  
Size Distribution ◽  
Flow Rate ◽  
Bubble Size ◽  
Axial Velocity ◽  
Gas Flow ◽  
Normal Function ◽  
Bubble Size Distribution ◽  
Low Flow ◽  
Gas Bubble ◽  
Log Normal

This work aims at figuring out the influence of gas bubble size distribution on the ladle stirring process. The work is conducted through three-dimensional (3D) numerical simulation based on the finite volume method. Mesh sensitivity test and the cross-validation are performed to ensure the results are mesh independent and the numerical set-up is correct. Two distributions, uniform and Log-normal function, are investigated under different gas flow rates and number of porous plugs. The results indicate that the results, e.g., the axial velocity and the area of the slag eye, have little difference for low flow rate. The difference becomes dominant whilst the flow rate is increasing, such as 600 NL/min. The Log-normal function bubble size distribution gives a larger axial velocity and a smaller slag eye area compared to the uniform bubble size distribution. This work indicated that, at a higher flow rate, the Log-normal function is a better choice to predict the melt behavior and the slag open eye in the ladle refining process if the bubble interaction is not considered.

Effect of Process Parameters on Characteristics of Spray-Dried Hydroxyapatite Granules

2017 ◽  
Vol 728 ◽  
pp. 341-346 ◽  
Author(s):  
Weeranuch Sukaraseranee ◽  
Sukasem Watcharamaisakul ◽  
Boris Golman ◽  
Jintamai Suwanprateeb
Keyword(s):  
Size Distribution ◽  
Air Temperature ◽  
Flow Rate ◽  
Feed Rate ◽  
Air Flow ◽  
Spherical Shape ◽  
Air Flow Rate ◽  
Uniform Size ◽  
Drying Conditions ◽  
Spray Dried

The effects of drying air temperature and flow rate, spraying air flow rate and slurry feed rate were investigated on the morphology, size distribution, density and flowability of spray-dried hydroxyapatite granules. The granules were of good spherical shape and smooth surface, but low flowability. The granules of uniform size distribution were obtained at high spraying air flow rate and granules of small sizes were collected at high spraying and drying air flow rates, high slurry feed rate and low drying air temperature. Thus, by adjusting the spray drying conditions we can control the granule properties.

Effects of Impeller Speed, Atomising Air Flow Rate and Fluidising Temperature in Agitated Fluidised Bed Granulation of Cocoa-Milk Powders

2005 ◽  
Vol 1 (3) ◽  
Author(s):  
Mohd Shamsul Anuar ◽  
Siti Masrinda Tasirin
Keyword(s):  
Moisture Content ◽  
Flow Rate ◽  
Air Flow ◽  
Impeller Speed ◽  
Fluidised Bed ◽  
Air Flow Rate ◽  
Operational Parameters ◽  
Operational Variables ◽  
Fluid Bed ◽  
Fluid Bed Granulation

Mechanically agitated fluid bed granulators with inserted impeller are currently favoured by the industry due to better particle mixing, heat transfer and effective particle growth. However, effects of operational variables such as impeller speed, atomising air flow rate and fluidising temperature on the physical characteristics of the generated granules are still not fully quantified. Scaling-up of industrial fluid bed granulation processes especially in the pharmaceutical industry are done empirically. In this paper, a study is described on the effects of impeller speed, atomising air flow rate and fluidising temperature on the flowability, moisture content, mean particle size and size distribution of the granulated cocoa-milk drink powder in an agitated fluid bed granulation process. Findings showed that when all the values of the three investigated operational parameters were increased, granules with better flowability characteristics, lower moisture content, smaller and more uniformed granules were obtained in the range tested.

scholarly journals Auto-Aspirated DAF Sparger Study on Flow Hydrodynamics, Bubble Generation and Aeration Efficiency

Processes ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 1498
Author(s):  
Dmitry Vladimirovich Gradov ◽  
Andrey Saren ◽  
Janne Kauppi ◽  
Kari Ullakko ◽  
Tuomas Koiranen
Keyword(s):  
Size Distribution ◽  
Water Flow ◽  
Flow Rate ◽  
Bubble Size ◽  
Transfer Rate ◽  
Pure Water ◽  
Water Flow Rate ◽  
Bubble Size Distribution ◽  
Bubble Generation ◽  
Aeration Efficiency

A novel auto-aspirated sparger is examined experimentally in a closed-loop reactor (CLR) at lab scale using particle image velocimetry, high-speed camera and oxygen mass transfer rate measurements. State-of-the-art 3D printing technology was utilized to develop the sparger design in stainless steel. An insignificant change in the bubble size distribution was observed along the aerated flow, proving the existence of a low coalescence rate in the constraint domain of the CLR pipeline. The studied sparger created macrobubbles evenly dispersed in space. In pure water, the produced bubble size distribution from 190 to 2500 μm is controlled by liquid flow rate. The bubble size dynamics exhibited a power-law function of water flow rate approaching a stable minimum bubble size, which was attributed to the ratio of the fast-growing energy of the bubble surface tension over the kinetic energy of the stream. Potentially, the stream energy can efficiently disperse higher gas flow rates. The oxygen transfer rate was rapid and depended on the water flow rate. The aeration efficiency below 0.4 kW/m3 was superior to the commonly used aerating apparatuses tested at lab scale. The efficient gas dissolution technology has potential in water treatment and carbon capture processes applications.

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