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The electrokinetic behavior of the oxidized coals and the hydrocarbon emulsion droplets were studied by an electrophoresis technique. Generally the isoelectric point (IEP) of the coals decreased with increasing degree of oxidation. A model of selective flotation of oxidized coal is postulated on the basis of the electrokinetic results.
@article{osti_7253983, title = {Electrokinetic study on the amine flotation of oxidized coal. [For separation from ash and pyrites]}, author = {Wen, W W and Sun, S C}, abstractNote = {The objective of this investigation was to study the electrokinetic behavior of oxidized coals to indicate the feasibility of separating oxidized coals from ash materials and pyrite by an amine flotation …
Oxidized coal is difficult to float using either kerosene or diesel. ... Performance of Vegetable Oils as Flotation Collectors for the Recovery of Coal from Coal Fines Wastes ... Coal Preparation. Volume 21, 2000 - Issue 4. Published online: 27 Apr 2007. Article. An Electrokinetic Study on the Oil Flotation of Oxidized Coal. W. W. Wen et al ...
@article{osti_5952205, title = {Electrokinetic study on the oil flotation of oxidized coal. [Separation from ash materials and pyrite]}, author = {Wen, W W and Sun, S C}, abstractNote = {The objective of this investigation was to study the electrokinetic behavior of oxidized coals and of hydrocarbon emulsion droplets of flotation reagents to indicate the feasibility of separating …
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Flotation results showed that oxidized coal flotation in the presence of nanobubbles resulted in 10% higher combustible matter recovery than conventional air bubble flotation. Moreover, it was found that the flotation of oxidized coal in the absence and presence of nanobubbles can be best described using the first-order model with the ...
Abstract The flotation of low-quality Russian and Mongolian coal by means of spent motor oil is investigated. Ozonization is used to improve the flotational properties of the spent oil. The optimal ozonization depth of oil used to enrich coal of poor metamorphic development is 5–6 g/kg. Ozonization increases the oil's content of oxygen-bearing …
University of Kentucky UKnowledge Theses and Dissertations--Mining Engineering Mining Engineering 2012 COLLECTORS FOR ENABLING FLOTATION OF OXIDIZED COAL Raghav M. Dube University of Kentucky, [email protected] Recommended Citation Dube, Raghav M., "COLLECTORS FOR ENABLING FLOTATION OF OXIDIZED COAL" (2012). Theses and …
Oxidized coal is difficult to float using either kerosene or diesel. In this investigation, we compared the flotation results obtained using biodiesel with those using diesel as a collector. It was found that the biodiesel could improve flotation of oxidized coal. FTIR study results show that the biodiesel contains much more abundant unsaturated fatty acids than diesel and the …
ABSTRACT In this study, the effect of pulp temperature on coal flotation was investigated. Waste vegetable oil was used as collector. Experiments were carried out at different temperatures (5, 25, 50, and 75°C) and the pros and cons of each temperature for flotation performance were revealed. While flotation performance was lower in higher pulp …
Abstract coal fines cf of 7500 mesh were agglomerated using vegetable oils sesame oil and castor oil with varying dosages from 51020. other parameters under this study were ash rejection ar and yield. forndil dosage the yield was found to be 84.93 using castor oil while for sesame oil it was merely 74.22.
The presence of these condensation products in the flotation medium is particularly effective to enhance the recovery of oxidized bituminous coal. 28,128-F ABSTRACT Certain condensation products of a fatty acid or fatty acid ester and a hydroxyalkylated alicyclic nitro-gen-containing compound are useful as conditioners to improve the recovery ...
Certain condensation products of a fatty acid or fatty acid ester and a hydroxyalkylated alicyclic nitrogen-containing compound are useful as conditioners to improve the recovery of clean coal in a froth flotation process. The presence of these condensation products in the flotation medium is particularly effective to enhance the recovery of oxidized bituminous coal.
Abstract. Employment of a latex emulsion prepared from a hydrocarbon, animal or vegetable based oil with a hydrophobic water-in-oil emulsifier and a hydrophilic surfactant in the froth flotation of coal improves coal recovery without increasing the ash content.
The influence of ozonization on the composition and flotation properties of spent motor oil is investigated. Preliminary ozonization increases the proportion of low-boiling components in the spent oil, reduces its viscosity, and improves its flotation properties in the enrichment of coking coal. Download to read the full article text.
The hydrophilic oxidized layer on the coal surface was effectively removed by ultrasonic cavitation, as identified by PSD, SEM, XPS, and contact angle, which increased the flotability and recovery of oxidized coal. However, prolonged ultrasonic pretreatment proved detrimental to oxidized coal flotation. The fresh exposed surface was reoxidized ...
Justia Patents With Modifying Agents US Patent for Flotation of oxidized coal with a latex emulsion of sodium polyacrylate used as a promoter Patent (Patent # 4,222,862) Flotation of oxidized coal with a latex emulsion of sodium polyacrylate used as a promoter . Oct 6, 1978 - ...
COLLECTORS FOR ENABLING FLOTATION OF OXIDIZED COAL Raghav M. Dube University of Kentucky, raghavdube2002@gmail ... with 15% product ash when using fuel oil as collector under natural pH conditions.A detailed study showed that increasing pH from natural value of 5.6 to 7.5 provided a
Froth flotation of coal is used in the art to beneficiate finely-divided raw coal. Bituminous coals generally possess a natural hydrophobicity, which results in the coal being floatable in the presence of a frother, such as methyl isobutyl carbinol, and …
Certain condensation products of a fatty acid or fatty acid ester and a hydroxyalkylated alicyclic nitrogen-containing compound are useful as conditioners to improve the recovery of clean coal in a froth flotation process. The presence of these condensation products in the flotation medium is particularly effective to enhance the recovery of oxidized bituminous coal.
Conventional hydrocarbon oil cannot adhere effectively to oxidized coal, resulting in a low yield of clean coal. In this study, a high-speed homogenizer was used to emulsify LDD (laurylamine dipropylene diamine) and kerosene, which enhanced the flotation efficiency of oxidized coal. The flotation results showed an increase from 4.12% (only kerosene) to 23.33% (emulsified …
Conditioner for flotation of oxidized coal. Full Record; Other Related Research; Abstract. Certain ether amines and their derivatives are useful to improve the recovery of clean coal in a froth flotation process. The presence of these ether amines and derivatives in the flotation medium is particularly effective to enhance the recovery of ...
The standard practice on coal in England has been to use cell-to-cell "Sub-A" Flotation Machines of the double overflow type. Several hundred of the large No. 30 cells (100 cu. ft./cell) are in use. Super-charging is not generally used. Flotation is carried out at low solids, usually under 10% dilution.
Numerous studies have been conducted describing the challenges with oxidized coal flotation. Common industrial collectors such as fuel oil are typically ineffective under natural conditions for the flotation of oxidized coal sources such as the Coalburg seam from the Central Appalachia coalfields of the U.S. Low plant flotation recovery values of less than 30% were …
A process for the flotation of particles of lignitic coal, subbituminous coal or oxidized bituminous coal contained within a slurry of coal and gangue, comprising the steps of dispersing a surfactant throughout the slurry, first conditioning the slurry such that the surfaces of the particles of coal are selectively coated by the surfactant to produce activated particles of coal, dispersing an ...
What is claimed is: 1. A froth flotation process for beneficiaing coal of flotation size which comprises floating the sized coal in a frothing aqueous medium comprising a fuel oil collector and an effective amount of a conditioner selected from the group consisting of (1) an ether amine or hydroxyalkylated ether amine represented by the formula I: ##STR7## wherein each R' is …
OF THESIS COLLECTORS FOR ENABLING FLOTATION OF OXIDIZED COAL The coalburg seam coal is an example of difficult to float bituminous coal. Laboratory tests conducted on coalburg flotation feed sample revealed recovery values around 28% with 15% product ash when using fuel oil as collector under natural pH conditions. A detailed study showed that increasing …
Abstract. This study aims to investigate the characteristics on bottom ash flotation using vegetable oils as a collector. The experiment of changing the kerosene dosage as a collector for the flotation of coal ashes, the recovery of unburned carbon and unburned carbon content were 80% and 63%, respectively, when the dosage of kerosene was 9 kg/ton.
Effect of Ultrasonic Pretreatment on Oxidized Coal Flotation Author: Mengdi Xu, Yaowen Xing, Xiahui Gui, Yijun Cao, Dongyue Wang, Longwu Wang Source: Energy & fuels 2017 v.31 2 pp. 14367-14373 ISSN: 1520-5029 Subject:
coal dryer is available for drying all kinds of coal, such as anthracite, lean coal, needs are also met by importing bituminous and anthracite coal and crude petroleum. cone crusher and other sandstone equipment;ball mill, flotation machine, o idized coal flotation vege le oil romania ball mill manufacturer best stone
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Xia et al. found that oxidized coal flotation can be achieved by using oxidized diesel oil also due to the hydrogen bonding with the polar part of oxidized coal surface and oxidized diesel oil ...
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