Jun 01, 2019· In this study, five flotation kinetics models,, as shown in Table 2 were chosen to assess the effects of the diesel oil before and after oxidation on the low-rank coal flotation kinetics. The combustible matter recovery after 0.5, 1, 1.5, 2 and 3 min of the flotation time was fitted to the five flotation kinetics models.
minerals Article Effect of Dodecane and Oleic Acid on the Attachment between Oxidized Coal and Bubbles Mengdi Xu 1, Yaowen Xing 1,2,*, Yijun Cao 3,4,* and Xiahui Gui 4 1 School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; [email protected]
Froth flotation of weathered coal is a challenging task in a conventional flotation cell using commonly used collector and frother. Generally weathered coal shows the erratic flotation behaviour due to the surface oxidation as it makes the coal surface hydrophilic. When the surface gets oxidized, surface modifier is employed to float the clean ...
Feb 01, 2000· Read "An improved class of universal collectors for the flotation of oxidized and/or low-rank coal, International Journal of Mineral Processing" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Improving Oxidized Coal Flotation Using Biodiesel as a Collector WENCHENG XIA, JIANGUO YANG, AND ... of vegetable oils has been reported as collectors for the recovery of coal from coal fines waste [12]. ... hogwash oil as a collector in flotation may provide economic, social benefits and may protect the …
Jul 14, 1981· Fuel oil is employed in the flotation medium as a collector and/or dispersing reagent. Representative fuel oils include diesel oil, kerosene, Bunker C fuel oil, mixtures thereof and the like. The fuel oil can generally be advantageously employed in a ratio of from about 0.02 to about 2.5 kilograms fuel oil per metric ton of coal flotation feed.
Aug 22, 1995· 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 ...
COAL FLOTATION OF LOW-GRADE PENNSYLVANIA ANTHRACITE SIL TS by H.S. LIU and ... Anthracite Coal (Non-oxidized), Using Fuel Oil No. 2 and Pine Oil as Reagents •••••• Effect of Conditioning Time on the Flotation of Anthracite Coal (Oxidized with KMno4), Using
The effect of environment, oxidation and dissolved metal species on the chemistry of coal flotation P. Somasundaran a, Lei Zhang a, D.W. Fuerstenau b.. a NSF lUCS Center for Suifactants. Henry Krumb School of Mines. Columbia University. New York. NY 10027. USA b Department of Material Science and Mineral Engineering. Evans Hall.
1 Froth Flotation – Fundamental Principles Froth flotation is a highly versatile method for physically separating particles based on differences in the ability of air bubbles to selectively adhere to specific mineral surfaces in a mineral/water slurry. The particles with attached air …
Coal flotation is characterized by the chemical and petro-graphical composition of coal and its rank. In addition, size and sp . gr. of coal particles, pulp density, rate and uniformity of feed, conditioning, type of reagents, pH, presence of clay and type of flotation machines are the other variables which influence the coal flotation.
Oil agglomeration and its effect on beneficiation and ...
bubble and the coal surface creating a repulsive force between them and reduce the coal flotation recovery [8]. When a frother is used as an emulsifier, it helps dispersion of oil collector (e.g. diesel oil) into fine droplets. These finer droplets of oil increase the probability of coal particle oil …
FLOTATION OF OXIDIZED COAL Raghav M. Dube University of Kentucky, [email protected] ... 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
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 ...
The semi-hydrophobic flocculant (F1029-D) was found to flocculate all the samples to a different extent (except the oxidized coal that was barely flocculated by this polymer). PAM was able to flocculate all the coal samples which is a clear indication of its insensitivity toward coal wettability.
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 pH from natural value of 5.6 to 7.5 provided a significant improvement in recovery of approximately ...
For coal flotation, coal surface oxidation affects the surface hydrophobicity which controls the true flotation of coal particles without affecting the mechanical entrainment in flotation. Therefore, the yield achieved from the flotation of heavily oxidized coal samples with low surface hydrophobicity was achieved by entrainment in this study.
flotation are: minus 35-mesh solid fe,d, 20 - 25 per cent pulp density, 7,5 pH, 8 minutes conditioning time, and 8 minutes flotation time. Fuel oil and pine oil are used as collector and frother, respectively. The rougher froth is subsequently cle~ned three times with minor additions of reagents.
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.
Feb 01, 2000· Read "Oil agglomeration and its effect on beneficiation and filtration of low-rank/oxidized coals, International Journal of Mineral Processing" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
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 oxidized coal ...
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.
collectors for low rank coal flotation Maoyan An 1, Yinfei Liao 2, Yijun Cao 2, Zhao 1, Yuliang Qiu 1 1 Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, PR China
The production method is also characterized by the rate of oxygen increase of the oxidized ashless coal obtained in the oxidation step being 2.0-10.0% and by the mixing ratio of the oxidized ashless coal during the molding step being 60-95 parts by mass in relation to 100 total parts by mass of the oxidized ashless coal and the unoxidized ashless coal.
Jul 21, 2017· Abstract. 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.
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 ...
Flotation - South Africa - Nalco Company | Flotation - Coal and Metals. Nalco Africa Home » Expertise » Applications » Flotation - Coal and Metals. Flotation - Coal and Metals. Since flotation is the heart of many mineral processing circuits, reagent performance …
In this study, desulfurization and deashing of Hazro coal via a flotation method were studied. For this purpose, experimental studies were conducted on the coal sample with ash, sulfur, volatile matter, and fixed carbon contents of 24.77%, 6.90%, 35.18%, and 38.06%, respectively, and two groups of flotation experiments were made.
Experiments on the flotation of laboratory-oxidized coal show that, while it is difficult to float oxidized coal with dodecane, the THF series of reagents have the capability of restoring the flotability of oxidized coal through their ability to hydrogen bond to oxygen functional groups on the oxidized coal surface.
India is rich in various mineral resources and it is an important mineral processing market.
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