flotation for such fines. Keywords coal flotation, column flotation, grinding, difficult-to-float, liberation. * National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, China. † Station of Coal Quality Supervision and Inspection, Anhui Province Coal Science Research Institute, China.
The effect of grinding mode on the efficiency of separation of pyrite and non-pyritic minerals from Pittshurgh No. S scam coal hy froth flotation was investigated. In the case of minus 600 micron feed, grinding mode had no effect on the efficiency of separation of cither pyrite or non-pyritic minerals.
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grinding on further flotation (Liu et al., 2011). In this regard, in our studies the sampled coking coal middlings were firstly ground by wet-milling in a ball mill with iron balls. Progressive release flotation tests of sized products (0.5-0.25, 0.25-0.125, 0.125-0.074 and <0.074 mm) were performed in comparison to the float-sink tests.
Flotation has been widely applied in coal processing to separate mineral matter from coal and enrich macerals. In this work, four kinds of coal samples were chosen from different coal fields, and the thermogravimetric analyzer and fixed bed reactor were used to study the pyrolysis behavior and product distribution of coal sample with different densities prepared by the float …
In this study, the flotation behavior of hard coal products having different particle shapes produced by different grinding conditions was investigated with and without reagents. As a …
Low flotation efficiency has always been a problem in the separation of low-grade molybdenum ores because of the finely disseminated nature and crystal anisotropy of molybdenite. In this study, a novel kerosene–coal tar collector (KCTC) was prepared and used to explore the feasibility of improving the recovery of fine molybdenite particles. The …
Coal is a valuable natural resource for economic development. Clean coal and gangue can be liberated through grinding to improve the recovery of the clean coal. In this study, the mineral composition, size distribution of the raw coal and the grinding time test were investigated. The results showed that the main gangue minerals in the raw coal were kaolinite, quartz, illite, and …
Abstract. The primary goal of this project is to develop advanced flotation methods for coal cleaning in order to achieve 90% pyritic sulfur removal at 90% Btu yield, using coal samples procured from six major US coal seams. Concomitantly, the ash content of these coals is to be reduced to 6% or less. Investigation of mechanisms for the control ...
flotation behavior and hydrophobicity of anthracite coal of mild oxidation before and after grinding using flotation. In addition, the Fourier Transform Infrared Spectroscopy (FTIR) analysis is used to explain the changes in the main functional chemical groups of anthracite coal of mild oxidation upon grinding. 2.
So grinding of oxidized bituminous coal might deteriorate flotation performance due to the increase of ultra-fine particles. In addition, the grinding process is usually at a high temperature ( Hadad and Sadeghi, 2012 ). In this condition, coal samples might be re-oxidized especially for lower rank coals ( Wang et al., 2003, Zhang, 2004 ).
The other enhancement methods for oxidized coal flotation, i.e., grinding, premixing/preconditioning, ultrasound, thermal, microwave and direct contact mixing of the reagents with dry coal before ...
@article{osti_6663644, title = {Method for the froth flotation of coal}, author = {Hansen, R D and Klimpel, R R}, abstractNote = {A method is described for recovering coal from a coal ore containing coal and non-combustible mineral matter which comprises the step of floating coal in a frothing aqueous medium containing an oxygen containing compound of the formula: R/sub 1/ …
The effect on principal flotation agent and fineness of grinding has already been discussed. The relation between percentage of solids and quantity of minor flotation agent seems to point to the conclusion that it is the concentration of the aqueous solution of the minor agent, rather than the quantitative relation between the minor agent and ...
In this study, the flotation behavior of hard coal products having different particle shapes produced by different grinding conditions was investigated with and without reagents.
Further, the production of a high quality, clean coal product may require grinding to fine particle size to achieve complete liberation. Coal flotation is one process which has been applied to cleaning coal fines for commercial use. Whereas in 1950, only a few flotation plants existed in the United States, 66 plants had developed flotation ...
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 …
Grinding flotation. Dry grinding of the oxidized samples was conducted in a laboratory rod mill at grinding times of 10, 20 and 30 min. The size distribution of Sample 0 and Zeta potential of all coal samples after different grinding times were measured by a laser particle size analyzer and Zeta potentiometer.
The bubbles of air, sucked or blown into the pulp in the flotation machines, become coated with mineral and rise to the surface where they collect in the form of a mineralized froth. This primary concentrate, in which the bulk of the mineral is collected, continuously flows or is scraped over the lip of the machine into a collecting launder.
hydrophobic flocculation-flotation is coal selecting technology again in a kind of coking early proposing, and utilizes ball mill centering coal to carry out fine grinding ore deposit, and...
Comparison of non-ionic and ionic collectors in the flotation of coal fines. H Sis, G Ozbayoglu, M Sarikaya. Minerals Engineering 16 (4), 399-401., 2003. 46. 2003. The effect of grinding on pyrophyllite flotation. M Erdemoǧlu, M Sarıkaya. Minerals engineering 15 (10), 723-725.
Froth flotation is the most commonly used technique for beneficiating fine coal. Since the mode of grinding, dry or wet, can affect differently the surface properties of coal and the gangue minerals it is important to understand its role in the flotation process.
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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 bubbles are then carried to the surface and
A method for separating ash and sulfur (including pyritic sulfur) contaminants from coal in a flotation process. The method comprises the steps of grinding the coal to small particlate size, forming a slurry of the ground coal and mixing the slurry with at least one compound selected from the group consisting of peroxy compounds, peroxides and superoxides the preferred …
In this simultaneous grinding and hydrophobic flocculation-flotation (SGHFF) process, the excess mechanical energy expended in grinding is utilized for mixing coal slurry, resulting in the formation of hydrophobic coal flocs in the mill. The SGHFF process was tested for removing ash and pyritic sulfur from Prince coal.
The flotation of oxidized coal can be well‐improved by dry-grinding, and the flotation of oxidized coal dry-ground with collector will also be discussed in this investigation. The grinding time ...
The low rank or oxidized coals show unpleasant flotation behavior. The non-coking coal from Talcher, contg. 26.8% ash, 4.9% moisture, 35.7% volatile matter and 1% oxygen was used for the investigation. The flotation performance of the weathered coal in a mech. and column flotation cell was compared at low ash level of about 12%.
This warrants fine grinding of non-coking coal in order to liberate the ash forming minerals from coal macerals. A non-coking coal sample of vitrinite type from India was ground to 44 µm (d80) and subjected to column flotation to improve its quality. The non-coking coal analyzing 34.6 % ash, 26.2 % volatile matter, 1.3 % moisture and 37.9 % ...
Pretreatments may be used to enhance the flotation of low rank/oxidized coals due to improved hydrophobicity. The primary methods of pretreatments are grinding, premixing/preconditioning, ultrasound, thermal, microwave and direct contact mixing of the reagents with dry coal before wetting.