Studies on impeller type, impeller speed and air flow rate in an industrial scale flotation cell. Part 3: Effect on superficial gas velocity

1996 ◽  
Vol 9 (6) ◽  
pp. 639-654 ◽  
Author(s):  
B.K. Gorain ◽  
J.-P. Franzidis ◽  
E.V. Manlapig
Keyword(s):  
Flow Rate ◽  
Air Flow ◽  
Industrial Scale ◽  
Impeller Speed ◽  
Air Flow Rate ◽  
Gas Velocity ◽  
Flotation Cell ◽  
Superficial Gas Velocity ◽  
Impeller Type

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.

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.

Removal of NH3 in Air Released from Rubber Latex Process Using Skim Serum Absorbent

2013 ◽  
Vol 844 ◽  
pp. 441-444
Author(s):  
Siranat Pansang ◽  
Preecha Kasikamphaiboon ◽  
Juntima Chungsiriporn
Keyword(s):  
Removal Efficiency ◽  
Flow Rate ◽  
Pure Water ◽  
Air Flow ◽  
Liquid Waste ◽  
Industrial Scale ◽  
Water Usage ◽  
Air Flow Rate ◽  
Treatment Efficiency ◽  
Rubber Latex

The treatment of NH3 releasing concentrated rubber latex to air was studied using skim serum in laboratory scale of bubble absorption reactor. The skim serum (pH 2.5 to 3) is a liquid waste from concentrated rubber latex. The concentration of NH3 in air (300 to 1500 ppmv) and air flow rate (0.5 to 1.5 l/min) feeding into the reactor were measured for the effect of the treatment efficiency. At lower NH3 concentration and air flow rate have resulted to higher NH3 removal efficiency. Bubble absorption reactor can be effectively used and applied to remove NH3 releasing from the concentrated rubber latex process to the air without any plugging of the skim rubber in the system. Skim serum waste liquid has the result in higher efficiency in NH3 removal comparing to pure water usage. This study would be practically used as a guidance for the further design and operate to minimize waste and emission control in rubber industrial-scale system.

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.

Influence of Air Flow Rate and Immersion Depth of Designed Flotation Cell on Barite Beneficiation

2016 ◽  
Vol 867 ◽  
pp. 66-70
Author(s):  
Nantawat Demeekul ◽  
Lek Sikong ◽  
Manoon Masniyom
Keyword(s):  
Flow Rate ◽  
Air Flow ◽  
Immersion Depth ◽  
Alkaline Condition ◽  
Enrichment Ratio ◽  
Chemical Compositions ◽  
Air Bubbles ◽  
Air Flow Rate ◽  
Flotation Cell ◽  
Concentrate Grade

This study aims to investigate the effect of flotation operating parameters such as immersion depth of downcomer and air flow rate on performance of barite minerals separation. The barite minerals utilized in this experiment mainly consist of barite and gangue minerals such as quartz, kaolinite, illite and microcline having the chemical compositions of 63.12% BaSO4, 18.22% SiO2, 13.49%Al2O3, 1.02% K2O, 0.69% Fe2O3 and 3.46% others and the particle size (d80) of about 37 microns. In the flotation cell, the air bubbles were generated using designed porous materials. The flotation of barite minerals were carried out in an alkaline condition at pH 9 with sodium oleate collector and terpineol frother. It was found that concentrate grades of barite for the air flow rates of 20, 30 and 40 L/min were nearly constant about 70% BaSO4 at the immersion depths of 5 and 10 cm but it increased at the depth of 15 cm. The immersion depth of 5 and 10 cm seems to have no effect on grade of concentrate while the depth of 15 to have such effect. The air flow rate had an effect on concentrate grade when 15 cm immersion depth was used. The optimum air flow rate of 30 L/min gave concentrate grade of 85% BaSO4 with the recovery and enrichment ratio of 73% and 1.3, respectively.

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