In the present work the salt flotation technique has been tested with 27 different inorganic electrolytes on two high ash coal samples The performance of various salt solutions were compared in terms of the separation efficiency At an arbitrary concentration of moles/liter the best results were obtained with CuSO/sub 4/ at 68 percent separation
·The addition of electrolytes considerably increases the recovery of mineral matter in coal flotation In this paper the effect of calcium ion on coal flotation in the presence of kaolinite clay was investigated through microflotation experiments on a mixed coal kaolinite system The interaction behavior and mechanism between coal particles
A large number of surfactants together with auxiliary additives are used in froth flotation Herein we discuss the important surfactants focusing on the mechanism by which they act in coal flotation processes Coal and rock have different wettability which play a key role in coal flotation Coal which are hydrophobic particles get attached
To better understand the fundamental steps involved in the froth flotation process the probability of collection has been determined for the flotation of a very hydrophobic ash free coal sample The results show that probability of collection increases rapidly with decreasing bubble size and the values are in good agreement with the theoretical collision
·In addition another important use of flotation is to purify coal reduce ash in fine coal and remove fine pyrite from coal Flotation is also suitable for treating fine and microfine materials and fine ore particles less than 10 microns which are difficult to be recovered by other beneficiation methods can also be treated by flotation
Efficient flotation of low rank coal is of great significance for the development of green and low carbon cycles Temperature is a crucial parameter of flotation but the mechanism of its effect on flotation lacks understanding In this paper the mechanism was studied by kinetic flotation scanning electron microscopy SEM Fourier transform infrared spectroscopy
Coal Flotation and Fine Coal Utilization Volume 14 Pages 1 367 2001 Download full volume Previous volume Next volume Actions for selected chapters Select all / Deselect all Chapter 2 Coal characteristics related to coal preparation Janusz S Laskowski Pages 9 29 View PDF Chapter preview
·The oxidized coal flotation is a serious problem which should be well solved as the demand for energy is increasing As is known coal oxidation processes include three major aspects oxygen adsorption gas release and heat release [3] The oxidation processes may occur outside and/or inside the coal particles
·In coal flotation the most commonly used collectors are oily materials collectors such as diesel oil and kerosene For higher rank coals the reagent consumption in flotation is low because of the high natural hydrophobicity of the coal However for low rank coals containing a greater amount of oxygen flotation performance with these oily
·Through the analysis diesel has almost no flotation ability for Sujiagou low rank coal The flotation yield is only about 10% which can indirectly show that the collecting ability of diesel on the coal surface is inferior When the dosage of collectors is low 250 g/t 500 g/t the flotation effect is deplorable and the flotation quality is
·1 Introduction Flotation is an effective method for processing fine materials like coal graphite copper etc [[1] [2] [3] [4]] The hydrophilic particles settle down as tailings and hydrophobic particles are brought into the foam as a concentration by the bubbles [[5] [6] [7]] However in actual flotation a lot of hydrophilic particles are found in
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
·1 Introduction Flotation is an effective method for processing fine materials like coal graphite copper etc [[1] [2] [3] [4]] The hydrophilic particles settle down as tailings and hydrophobic particles are brought into the foam as a concentration by the bubbles [[5] [6] [7]] However in actual flotation a lot of hydrophilic particles are found in
Abstract The flotation response of two high sulfur coals to a variety of collectors was studied in detail using a 2 liter Denver flotation cell In comparison with dodecane as the standard oily collector the introduction of a benzene ring into the oily collector can significantly improve its collecting ability for coal In our two series of compounds containing
·In this work the effect of ultrasonic pretreatment time on oxidized coal flotation was studied Analytical techniques such as particle size distribution PSD scanning electron microscopy SEM X ray photoelectron spectroscopy XPS contact angle measurement and specific surface area/pore analysis were used to examine the
·Coal flotation is a separation process performed mainly based on differences in surface hydrophobicity between coal and gangue The flotation reagent can improve the hydrophobicity of coal and also the adhesion between coal and air bubbles Kerosene and light diesel oil are widely used as collectors in coal flotation
·Fatty acids which are enriched in vegetable oil have attracted much attention in low rank coal flotation because of their unique chemical structure In this study density functional theory calculations molecular dynamics simulations and atomic force microscopy were employed to investigate the adsorption structure and forces between
·The coal pulp was first stirred for 2 min at an impeller speed of 1800 r/min Then the collector and frother were added for another stirring time of 120 and 30 s respectively The airflow rate was m 3 /h and the flotation concentrate clean coal was collected for a flotation duration of 300 s The concentrates and tailings were filtered
·In this work the effect of ultrasonic pretreatment time on oxidized coal flotation was studied Analytical techniques such as particle size distribution PSD scanning electron microscopy SEM X ray photoelectron spectroscopy XPS contact angle measurement and specific surface area/pore analysis were used to examine the
·The selective depression of pyrite from the Kentucky No 9 coal seam was systematically examined using various kinds of inorganic and organic chemicals Most of the organic chemicals tested showed little selectivity in pyrite depression It was found that both orthophosphate and pyrophosphate were effective for the selective depression of coal
·The addition of electrolytes considerably increases the recovery of mineral matter in coal flotation In this paper the effect of calcium ion on coal flotation in the presence of kaolinite clay was investigated through microflotation experiments on a mixed coal kaolinite system The interaction behavior and mechanism between coal particles
· Flotation tests Coal flotation was conducted in a dm 3 JK batch flotation cell using de ionised water For each test 100 g dry coal sample was added into dm 3 water and stirred for 3 min at an agitation speed of 1200 rpm to achieve the sufficient dispersion of coal particles Then the slurry was topped up to dm 3 by adding extra
·In order to enhance the coal flotation in a high pulp density slurry new equipment such as a flash flotation machine hydraulic machine and series flotation column were developed and applied in high pulp density flotation; Xie et al combined a jet flotation column JFC and a cyclonic micro bubble flotation column FCMC into one
·Coal preparation is one of the main methods to obtain clean coal among which flotation is an effective technique to reduce ash and sulphur content in coal Cai et al 2020 Chelgani et al 2016 Cheng et al 2023d Zhang 2011 Zhu et al 2021
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