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N. A. Abdel-khalek - One of the best experts on this subject based on the ideXlab platform.
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Role of frothers in Column Flotation of coarse phosphates
Mining Metallurgy & Exploration, 2003Co-Authors: H. El-shall, N. A. Abdel-khalek, S. El-moftyAbstract:The use of Column Flotation has become increasingly popular. Although normally used for the Flotation offline particles, Column Flotation was successfully used by the University of Florida for the Flotation of phosphate from coarse feed (0.85 × 0.42 5-mm), fine feed (0.425 × 0.106-mm) and even unsized feed (0.85 × 0.106 mm). The application of frother in Column Flotation is essential to control the bubble size. In this paper, the role of frother type on the Flotation of coarse Florida phosphate is highlighted. Two types of anionic and nonionic frothers were used. Statistical designs were used to determine the effects of collector dosage, frother concentration and pH, as well as the interactions between them. The results were then correlated with the measured air holdup and bubble diameter. The results show that, depending on the experimental conditions, concentrates containing from 24.71% to 31.21% P_2O_5 with recoveries of up to 96.1% can be obtained. The results indicate that frother type strongly affects phosphate recovery and concentrate grade. The interactions of the frother type, the concentration of collector and the pH are shown to play very important roles in determining the overall efficiency of Column Flotation in the recovery of coarse phosphate.
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Column Flotation of Florida phosphate: an optimization study
Mining Metallurgy & Exploration, 2001Co-Authors: H. El-shall, N. A. Abdel-khalek, R. Sharma, S. Svoronos, S. GuptaAbstract:This paper presents the results of a Column Flotation study on a fine feed sample of Florida phosphate. A central composite design was used to study the main and interaction effects of parameters affecting Column efficiency. The statistical design is also used to determine the optimum conditions. The results indicate that, depending on the experimental conditions, it is possible to produce a high-grade concentrate with a high recovery. A 15-ppm concentration of nonionic frother was found sufficient to maximize the recovery at pH of 9.5.
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Collector–frother interaction in Column Flotation of Florida phosphate
International Journal of Mineral Processing, 2000Co-Authors: Hassan El-shall, N. A. Abdel-khalek, S. SvoronosAbstract:Abstract This study examines main and interaction effects of frother type, collector and pH on the efficiency of Column Flotation of Florida phosphate. Two types of frothers are used including sodium alkyl ether sulfate, as an anionic frother, and mixed polyglycols as a nonionic frother. A mixture of fatty acid and fuel oil is used as a collector. The results show that Column Flotation, depending on the operating conditions, can give phosphate concentrates of high grade (∼31% P 2 O 5 ) at a recovery as high as (∼99%). However, interaction between frothers and the collector and consequently the Flotation efficiency were found to be dependent on frother type. Specifically, anionic frother was found to lose its ability to stabilize the froth in the presence of low dosages of collector. An anionic frother used in the presence of conditioning water containing residual collector (i.e., supernatant water after conditioning solids with collector) resulted in a significant reduction in recovery. This phenomenon does not occur with the polyglycol (nonionic) frother. Flotation results of the three-phase system have been confirmed by results obtained in two-phase experiments where a low dosage of collector is added while measuring air hold-up in the presence of different frothers. The residual collector reduces air hold-up and increases bubble size when added with the alkyl ether sulfate (anionic) frother. On the other hand, a synergistic effect was obtained in the presence of the nonionic frother.
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Separation of Valuable Fine Phosphate Particles from Their Slimes by Column Flotation
Separation Science and Technology, 2000Co-Authors: N. A. Abdel-khalek, F. Hassan, M. A. ArafaAbstract:Large quantities of fines are generated as slimes during beneficiation of phosphate ores. These slimes are discarded due to the lack of a suitable method for their treatment. This decreases the total recovery of phosphate. Moreover, the presence of these slimes causes an environmental problem in some localities. This paper studies the possibility of recovering the valuable fine phosphate particles (45 μm) from their slimes through the application of the Column Flotation technique. Tests were performed using oleic acid as a collector for the phosphate minerals, and sodium silicate as a depressant for their associated gangues. The main operating parameters affecting the performance of Column Flotation were investigated. The results indicate that the best operating conditions for Column Flotation of phosphate slimes are: superficial gas velocity 0.84 cm/s, frother concentration 0.1 kg/ton, Column height 230.5 cm, and superficial water velocity 2.2 cm/s. At these conditions a product assaying 25.3% P2O5 (∼55....
Bandaru V. Ramarao - One of the best experts on this subject based on the ideXlab platform.
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Deinking of recycled pulps using Column Flotation: energy and environmental benefits
Resources Conservation and Recycling, 2000Co-Authors: S. Chaiarrekij, H. Dhingra, Bandaru V. RamaraoAbstract:Abstract Deinking of recycled pulps is an important operation intended to provide pulps appropriate for making paper and paperboard products from recycled wastepaper. Conventionally, deinking of recycled pulp is conducted in a Flotation cell equipped with an agitator. We have investigated the applicability of a new Flotation cell based on a Column without an agitator present to accomplish the deinking of typical wastepaper feedstocks and also a feedstock consisting of rejects from a conventional deinking cell. Experimental results on the deinking operation indicate that it is possible to achieve deinking of a mixture of photocopier and laserprinted paper in the Column Flotation cell. The performance of the Column, as measured by the resultant pulp’s brightness and ink particle size distributions, is comparable to that of a conventional laboratory cell which incorporates severe agitation regimens. Thus, it is found that the agitator can be eliminated by using the Column Flotation design which could yield significant electrical energy savings in addition to savings in capital costs and other operational and maintenance costs. A series of deinking experiments were also performed on a feedstock consisting of rejected waste obtained from a conventional cell in a pilot plant. We found that deinking of the rejected waste could yield significant usable fiber. This indicates the potential of the Column Flotation technique in enhancing the reuse of a waste component thus reducing the volume of deinking waste rejected into the environment.
M.j. Mankosa - One of the best experts on this subject based on the ideXlab platform.
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Column Flotation at the Middle Fork Preparation Facility
Coal Preparation, 1994Co-Authors: V. L. Davis, Gerald H. Luttrell, F. L. Stanley, P. J. Bethell, M.j. MankosaAbstract:Abstract A laboratory and pilot-scale test program was carried out to assess the merits of installing Column Flotation cells at the Middle Fork coal preparation facility. The test data showed that Column cell technology was superior to single- and multi-stage conventional Flotation circuits in terms of fine coal recovery and product grade. In light of these promising results, a full-scale Column Flotation circuit was designed, installed and commissioned at the Middle pork plant. The circuit utilizes five 3-m diameter Microcel™ Flotation Columns to process approximately 100 tph of minus 150 μm raw coal. The Column retrofit reduced the ash content of the plant's Flotation circuit by nearly 7 percentage points and increased the combustible recovery by approximately 27 percent. This article provides a summary of the test results and discusses the scale-up procedures used to design the commercial Columns.
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A study of axial mixing in Column Flotation
International Journal of Mineral Processing, 1992Co-Authors: M.j. Mankosa, Gerald H. Luttrell, G.t. Adel, Roe-hoan YoonAbstract:Abstract Pulsed tracer tests have been conducted to quantify the effect of physical variables on axial mixing in Column Flotation. The tracer studies were used to determine the residence time distribution (RTD) for different Column geometries and operating conditions. For each test, the Peclet number and mean residence time were determined from the RTD data. Based on these results and industrial test data, a dimensional analysis approach was taken to develop an expression that relates Peclet number to Column geometry and operating variables. Using this expression, it is possible to estimate the scale-up factors, in terms of retention time, that are necessary to account for increased mixing in larger Columns.
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In-plant testing of microbubble Column Flotation. Final report
1991Co-Authors: Roe-hoan Yoon, Gerald H. Luttrell, G.t. Adel, M.j. MankosaAbstract:Microbubble Column Flotation (MCF) was developed at the Virginia Center for Coal and Minerals Processing (VCCMP) for the selective recovery of fine particles. Bench-scale test work conducted at VCCMP, largely under the sponsorship of the U.S. Department of Energy (DOE), showed that the technology worked well for both coal and mineral applications. For the technology to be commercially successful, however, a full-scale demonstration of the MCF technology was deemed necessary. This report summarizes the results of work performed under the DOE project entitled ``In-plant Testing of Microbubble Column Flotation.`` The objectives of this research and development effort were to duplicate the bench-scale performance of the MCF process in a full-scale unit, to verify the scale-up procedure developed in an earlier project, and to demonstrate the applicability of the MCF technology to the coal industry.
Humberto Jorge José - One of the best experts on this subject based on the ideXlab platform.
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Comparison of coagulants and coagulation aids for treatment of meat processing wastewater by Column Flotation.
Bioresource technology, 2008Co-Authors: Rênnio F. De Sena, Regina De Fátima Peralta Muniz Moreira, Humberto Jorge JoséAbstract:Abstract The physicochemical treatment of the wastewater from a meat processing industry was studied using three ferric salts as coagulants in conjunction with four different polymers as coagulation aids by batch Column Flotation. The effluent was characterized in terms of pH (6.5–6.7), turbidity (1000–12000 NTU), total solids (TS) (2300–7000 mg l −1 ), oils and greases (OG) (820–1050 mg l −1 ), and biochemical and chemical oxygen demands (BOD 5 and COD) (1200–1760 and 2800–3230 mg l −1 ), respectively. The treatments achieved typical organic load reductions of oils and greases, and total solids (up to 85%), as well as biochemical and chemical oxygen demands (between 62.0–78.8% and 74.6–79.5%, respectively). The research also found that the utilization of a Column Flotation achieved high efficiency of organic matter removal and its operation as a primary treatment showed no significant dependence of pollutant removal and air flow rate.
Hulya Kursun - One of the best experts on this subject based on the ideXlab platform.
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The influence of frother types and concentrations on fine particles' entrainment using Column Flotation
Separation Science and Technology, 2016Co-Authors: Hulya KursunAbstract:ABSTRACTEntrainment which is the characteristic feature of fine particles is closely related to water recovery. It is based on the changes depending on the establishment of linear relationship between water recovery and solid recovery. This paper deals with the investigation of the effect of frother types and concentrations on fine particles’ entrainment using Column Flotation. Entrainment of fine particle using a mixture of artificial ore (celestite:calcite; 1:1) was investigated in Column Flotation. In a two-phase system (water/air), the variation of bubble diameters and gas hold-up with a superficial air rates using different frother types and concentrations were tested. The results showed that the frother types and concentrations had significant effect on the grade and recovery, superficial air rate, gas hold-up and fine gangue entrainment. Entrainment factors for frother types and concentrations were compared in Flotation Column. Kirjaveinen[11] model was used for describing the specific entrained fa...
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Zinc Recovery from a Lead–Zinc–Copper Ore by Ultrasonically Assisted Column Flotation
Particulate Science and Technology, 2014Co-Authors: Hulya Kursun, Ugur UlusoyAbstract:In this study, zinc recovery from lead–zinc–copper ore was performed by Column Flotation with and without ultrasonic pretreatment. First, optimization of operational parameters was carried out by only single-stage Column Flotation without ultrasonic pretreatment. A zinc concentrate containing 16.93% Zn was obtained from the feed containing 2.71% Zn with 29.41% recovery using single-stage Column Flotation. Second, a concentrate containing 24.51% Zn was obtained with a recovery of 39.97% when ultrasonic pretreatment was applied to zinc beneficiation by single-stage Column Flotation at these optimized conditions. Third, a zinc concentrate having 53.41% Zn was produced with a recovery of 71.48% by using three stages of cleaning and three stages of scavenging Flotation by Column. Finally, a zinc concentrate containing 73.32% Zn was received with a recovery of 76.44% when the ultrasonic pretreatment was used before Column Flotation by multiple stages. The results revealed that zinc grade and recovery were incre...
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Effect of Fine Particles' Entrainment on Conventional and Column Flotation
Particulate Science and Technology, 2014Co-Authors: Hulya KursunAbstract:The entrainment of particles in a Flotation has been considered as one of the significant factors affecting both concentrate grade and recovery for a decades. It is based on the changes depending on the establishment of linear relationship between water recovery and solid recovery. In this study, entrainment of fine particle using a mixture of artificial ore (celestite:calcite; 1:1) was investigated in conventional and Column Flotation. The effects of frother concentration and particle size were tested. The results showed that the particle size and frother concentration had significant effect on the grade and recovery, Flotation time, and fine gangue entrainment. Entrainment factors for the conventional and Column Flotation were compared. Kirjaveinen (1989) model was used for describing a specific entrained factor (P i ) of hydrophilic particles. It has been found that Kirjaveinen model supports the results of this study.
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Determination of Carrying Capacity Using Talc in Column Flotation
Arabian Journal for Science and Engineering, 2011Co-Authors: Hulya KursunAbstract:C_a (g/min cm^2), the maximum solids concentrate rate or carrying capacity in Column Flotation, is expressed as the mass of solids from the overflow per unit of Column cross sectional area. It can be measured for a given set of operating conditions by determining concentrate solids rate as a function of feed solids rate. Carrying capacity is expected to depend on particular variables, such as particle size, feed solids rate, bubble diameter, air hold-up, cross section, residence time and the presence and absence of frother. In this study, the effects of these parameters on the carrying capacity in Column Flotation using talc mineral were investigated using optimized operation parameters. It was found that carrying capacity decreased as particle size decreased, and the amount of material carried into the concentrate increased with addition of MIBC (methyl isobutyl carbinol) frother. As air rate increased, the average bubble size and carrying capacity increased. When feed solids rate increased, the concentrate solids rate increased owing to a decrease in particle residence time. Feed rate therefore also plays an important role in determining carrying capacity.
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Adsorption and Column Flotation studies on talc using anionic and cationic collectors
Korean Journal of Chemical Engineering, 2010Co-Authors: Hulya Kursun, Ayten AtesAbstract:Adsorption properties and Column Flotation were studied to investigate the interaction of the anionic and cationic collectors and Flotation recoveries for talc mineral. Adsorption capacity is dependent on pH, adsorption time, temperature, collector concentration, and particle size. Langmuir adsorption model was suitable for describing isotherms. Analyses were carried out using UV spectrometry. In this study, we analyzed some parameters affecting Column Flotation performance. It was determined that adsorption capacity, especially, had an important role in Column Flotation enrichment.