Selective Oil Agglomeration Research Articles

Impact of cationic-anionic surfactants on selective oil agglomeration of oil shale

Impact of cationic-anionic surfactants on selective oil agglomeration of oil shale

Desulphurizatıon and Deashıng of Fine Coal by Selective Oil Agglomeration Using Waste Motor Oil

Oil agglomeration and enhanced gravity separators are considered to be methods of fine coal cleaning in the future. Although oil agglomeration has benefits, such as high recovery, cleaner product, suitability to oxidized coals, and simple and cheap dewatering stage, it has not been applied in commerecial scale due to oil costs. Use of waste motor oil in the agglomeration instead of original oils can be the solution to this problem. In the present study, fine oxidized coal with a high percent of sulphur was subjected to the agglomeration process by using waste motor oil. The effects of some parameters, including solid concentration, WMO dosage, agglomeration time, stirring speed, coal particle size, pH, and size of recovery sieve, on process performance were investigated. Rejections of ash and pyritic sulphur were obtained to be in the range of 17.94–41.35% and 1.29–36.27%, respectively.

Investigation of oil agglomeration behaviour of Tuncbilek clean coal and separation of artificial mixture of coal–clay by oil agglomeration

Oil agglomeration technique is one of the several major physicochemical separation processes in fine particle processing. In this study, the oil agglomeration behaviour of Tuncbilek clean coal was investigated and studied to find operating parameters that would decrease the ash content of the clean coal. The optimum conditions for agglomeration time, kerosene concentration and stirring speed were determined to be 20min, 31.6wt.%, and 1500rpm, respectively. Also, the ash content of the coal could be decreased by the addition of methanol.The separation of various artificial mixtures of coal–clay samples was also investigated under the determined optimum conditions. The coal could be agglomerated with above 80% of combustible recovery. The ash content was nearly the same for all conditions and determined to be approximately 6%. The coal was separated from clay minerals with high combustible recovery and low ash content using selective oil agglomeration technique.

Investigation of the Effects of Various Bridging Liquid Types on Deashing of a Lignite Sample by Selective Oil Agglomeration

The aim of this study was to investigate the effects of various bridging liquid types on deashing of Muş-Elmakaya lignite by the agglomeration method. Experimental studies were conducted on the lignite sample with ash, sulfur, volatile matter, and fixed carbon contents of 39.15, 5.12, 47.19, and 13.66%, respectively. For this purpose, four vegetable oils (olive oil, canola oil, corn oil, and hazelnut oil), kerosene, MolyFlo, diesel oil, 50% diesel oil plus 50% fuel oil, and 50% kerosene plus 50% fuel oil were used in the experiments. The effects of solid concentration, bridging liquid type and dosage, and pH on the agglomeration were investigated. Agglomeration results showed that the usage of vegetable oils in the agglomeration medium had a positive effect on the reduction of ash content of agglomerates. It was found that an agglomerate product containing 27.30% ash was obtained from a feed that contained 39.15% ash when canola oil was used in the agglomeration.

The Selective Oil Agglomeration of Combustibles in Fines of Low Grade Lignite of Barmer Rajasthan (India)

Oil agglomeration is one of the more effective methods for recovering and reducing ash of lignite fines. The effects of some parameters that markedly influence the effectiveness of selective oil agglomeration, such as solid concentration, amount of agglomeration oil, agglomeration time, and effect of various hydrocarbon oils were systematically studied. The sample of Giral Lignite Mines of RSSM in Barmer district was agglomerated with different hydrocarbon oils, such as toluene, diesel, and pine oil. The calorific value of the lignite sample has been recovered to 2,190 kcal/kg from 1,687 kcal/kg and reduced ash from 35.50 to 28.47%.

Desulfurization and de-ashing of a mixture of subbituminous coal and gangue minerals by selective oil agglomeration

The aim of this study was to investigate desulfurization and de-ashing of a mixture of subbituminous coal and gangue minerals by the agglomeration method. For this purpose, experimental studies were conducted on a mixture containing subbituminous coal, pyrite, quartz and calcite. The effects of some parameters that markedly influence the effectiveness of selective oil agglomeration, such as solid concentration, pH, bridging liquid type and concentration, and depressant type and amount, were investigated. Agglomeration results showed that the usage of various depressants (Na{sub 2}SiO{sub 3}, FeCl3, corn starch, wheat starch) in the agglomeration medium has a positive effect on the reduction of ash and total sulfur content of agglomerates. It was found that an agglomerate product containing 3.03% total sulfur and 25.01% ash with a total sulfur reduction of 56.71% was obtained from a feed that contained 7% total sulfur and 43.58% ash when FeCl{sub 3} was used in the agglomeration medium.

Selective Oil Agglomeration of Lignite

In this study, desulfurization and deashing of Adıyaman-Gölbaşı lignite by the agglomeration method were studied. For this purpose, three groups of agglomeration experiments were made. The effects of solid concentration, bridging liquid type and dosage, pH, and screen size on the agglomeration after desliming were investigated in the first group of experiments. The effects of lake water and sea water (the Mediterranean Sea water, the Aegean Sea water, and the Black Sea water) on the agglomeration were investigated in the second group of experiments. The effects of different salts (NaCl, MgCl2, and FeCl3) on the agglomeration were investigated in the third group of experiments. Agglomeration results showed that the usage of sea waters and soda lake water in the agglomeration medium had a positive effect on the reduction of total sulfur content of agglomerates. In addition, the usage of NaCl, MgCl2, and FeCl3 in the agglomeration medium had a positive effect on the ash content reduction of the agglomerates.

Desulfurization and Deashing of Hazro Coal by Selective Oil Agglomeration in Various Water Mediums

The aim of this study was to study the effects of various water mediums on desulfurization and deashing of Hazro coal by the agglomeration method. For this purpose, three groups of agglomeration experiments were made. The effects of some parameters that markedly influence the effectiveness of selective oil agglomeration, such as solid concentration, bridging liquid concentration, and pH, on the agglomeration were investigated in the first group of experiments. The effects of different salts (NaCl, MgCl2, and FeCl3) on the agglomeration were investigated in the second group of experiments. The effects of lake water and sea water on the agglomeration were investigated in the third group of experiments. The influences of the Mediterranean Sea water and Aegean Sea water on the removal of ash and total sulfur were found to be important.

Selective oil agglomeration in Sırnak asphaltite beneficiation

In this study, the possibility of cleaning Sırnak asphaltite by the agglomeration method was investigated. Experimental studies were conducted on the asphaltite sample with ash, sulphur, volatile matter and fixed carbon contents of 44.8, 6.0, 38.0, and 17.2 wt%, respectively. For this purpose, laboratory tests were carried out to investigate the effects of grinding time, bridging liquid type, bridging liquid concentration, pulp density and agitator speed on the overall performance of the agglomeration process. Furthermore, the effects of sea water and lake water on the combustible recovery and ash contents of the agglomerated products were investigated. The optimum conditions determined were: grinding time: 50 min, bridging liquid type: 50% kerosene+50% fuel oil, bridging liquid concentration: 30%, pulp density: 12.5%, stirring speed: 1800 rpm. It was found that the effects of sea water and lake water on the removal of ash were negative.

Investigation of agglomeration rates of two Turkish lignites

Oil agglomeration is an effective technique for recovering and reducing the ash of coal fines. In this study, the effects of some parameters that markedly influence the effectiveness of selective oil agglomeration, such as solids concentration, amount of agglomeration oil and agglomeration time, on the recovery of agglomerate and the ash and the pyritic sulphur content of the agglomerates were investigated. In order to delineate the relation between the formation rate of coal–oil agglomerates and the removal of ash and pyritic sulphur, the rates of agglomeration for Balkaya and Aşkale lignites were also calculated by using experimental data. It was found that the success of the process in terms of both recovery and selectivity for lignites was highly dependent on the parameters and control of the agglomeration rate.

Research on the deep-cleaning by selective oil agglomeration

Research on the deep-cleaning by selective oil agglomeration

98/01849 Evaluation of response of brown coal to selective oil agglomeration by zeta potential measurements of the agglomerates : Gurses, A. et al. Fuel, 1997, 76, (14/15), 1439–1444

98/01849 Evaluation of response of brown coal to selective oil agglomeration by zeta potential measurements of the agglomerates : Gurses, A. et al. Fuel, 1997, 76, (14/15), 1439–1444

98/01872 Selective oil agglomeration of Lafia coal, Nigeria : Uwadiale, G. G. O. O. Trans. Soc. Min., Metall., Explor., 1996 (Pub. 1997), 300, 179–180

98/01872 Selective oil agglomeration of Lafia coal, Nigeria : Uwadiale, G. G. O. O. Trans. Soc. Min., Metall., Explor., 1996 (Pub. 1997), 300, 179–180

98/00064 Evaluation of response of brown coal to selective oil agglomeration by zeta potential measurements of the agglomerates

98/00064 Evaluation of response of brown coal to selective oil agglomeration by zeta potential measurements of the agglomerates

Evaluation of response of brown coal to selective oil agglomeration by zeta potential measurements of the agglomerates

The effects of suspension pH, concentration of surfactant (cetyltrimethylammonium bromide, CTAB) and concentrations of electrolytes (FeCl 3, CaCl 2 and NaCl) on the recovery of agglomerate and on the reductions in ash and pyritic sulfur in selective oil agglomeration were investigated. The correlation between recovery and reductions in ash and pyritic sulfur and the zeta potential of the agglomerates was also studied. It was found that there was a close correspondence between them and that zeta potential measurements on the agglomerates would give a measure of the effectiveness of oil agglomeration.

97/02537 Recovery of fine coal from coal preparation plants and tailings ponds by selective oil agglomeration

Environmental pressures are mounting over the practice of washery rejects disposal in tailings ponds and it is also recognized that reject fines are a valuable source of coal. Oil agglomeration has always been a potential candidate for fine coal recovery, but it has failed to see widespread use in the past, due mainly to the high cost of the oil. A hitherto unutilized source of low cost rejects oil was used successfully as an agglomerating agent in laboratory studies and favorable economics have been demonstrated. High yields of reduced ash coal have been obtained, with low oil to coal loadings. The oil is abundant, low in sulfur, ash and heavy metals, and has a low toxicity. Effective utilization of the oil required the development of a suitable emulsion chemistry, capable of handling the changing properties of the various feeds (thickener feed, thickener underflow and tailings pond). With successful development of the process in the laboratory, a PDU scale up followed, incorporating a number of novel ideas. Inclusion of an aeration technique enhanced flotation, allowed higher coal yields and facilitated the removal of water and mineral matter from the coal agglomerates. A pilot plant of two tonnes per hour is beingmore » installed in a coal washery located in Nth Western NSW, based upon the laboratory and PDU studies. There are two coal sources, one an underground coal seam and the other an open cut. Reject fines from both these sources will undergo processing in the agglomeration plant, as well as material from a large tailings pond. The laboratory studies, PDU studies and pilot plant will be discussed and an economic assessment of the PDU presented.« less

Selective oil agglomeration of Lafia coal, Nigeria

Because mineral matter is finely distributed within the matrix, Nigerian Lafia coal is nonresponsive to conventional processing techniques. However, testing has shown that Lafia coal can he upgraded by selective oil agglomeration. The optimum oil concentration was found to be 10 mL of paraffin per 25 g of coal. A product containing 6% ash and 1.9% sulfur was obtained with a yield of 90%. Optimum results were achieved with a grinding time of from 2.5 and 3 hrs, which produced a 98% −400 mesh product. However, further grinding was found to be deleterious to the process. Also, high pH adversely affected concentrate yields. Utilizing kerosene as a bridging liquid, a product containing 4% ash and 0.33% sulfur was achieved at a natural pH of 6.3 with a yield of 85%. At pH 9 and 10, a product containing 4.5% ash was achieved with a yield of >90%.

96/04728 Selective oil agglomeration of brown coal: A systematic investigation of the design and process variables in the conditioning step

96/04728 Selective oil agglomeration of brown coal: A systematic investigation of the design and process variables in the conditioning step

Selective oil agglomeration of brown coal: a systematic investigation of the design and process variables in the conditioning step

Oil agglomeration is an effective technique for recovering and deashing coal fines. Conditioning is the most important unit operation prior to agglomeration or size enlargement. In this study, the effects of the design and process parameters in the conditioning step, which markedly influences the effectiveness of selective oil agglomeration, on the recovery of agglomerate and the ash and pyritic sulfur content of the agglomerates were investigated. It was found that the success of the process in terms of both recovery and selectivity for a brown coal was highly dependent on the conditioning parameters. In addition, an empirical equation which relates the recovery with all the conditioning parameters was developed. The values calculated by this equation closely matched the experimental values.

96/00060 Investigations of coal purification by selective oil agglomeration

96/00060 Investigations of coal purification by selective oil agglomeration