coal flotation

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US4770767A - Method for the froth flotation of coal - Google …

The froth flotation of coal is conducted in the presence of a conditioner of an oxygen containing compound of the formula: R.sub.1 --O--R.sub.2).sub.n (I) wherein R 1 and each R 2 are independently saturated hydrocarbyls and n is from 1 to about 3.

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Coal surface control for advanced fine coal flotation - OSTI.GOV

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 ...

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Coal flotation process - Patent SK-279033-B6 - PubChem

Coal flotation process. Cite. Download. Patent: SK-279033-B6: Inventor: MACHO VENDELIN (SK) RENDKO TIBOR (SK) JURECEK LUDOVIT (SK) JURECEKOVA EMILIA (SK) Date: Priority . 1993/06/07. This web page summarizes information in PubChem about patent SK-279033-B6. This includes chemicals mentioned, as reported by PubChem contributors, as well as other ...

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Understanding and improving the flotation of coals with …

The degree of coal surface oxidation was determined as the at.% oxidized carbon. • A critical degree of coal surface oxidation was identified for coal flotation. • Above the critical degree, flotation of oxidized coals was impossible with diesel. • The flotation of oxidized coals was improved by mixing diesel with X-100. •

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Flotation of coal

©2019-2020 , icp20016256-6 31011702005475 icp20016256-6 31011702005475

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Improvement of coal flotation by exposure of the froth to …

Flotation is a physicochemical process which is widely used to beneficiate minerals and coals in fine and ultrafine size fractions. The process utilizes air bubbles to selectively pick up hydrophobic particles in the pulp zone and levitate the bubble-particle aggregates to the froth zone (consisting of gas, liquid and solid phases).

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Coal Beneficiation Process Diagram

Coal flotation concentrates produced in this primary section are filtered direct and the filtrate is re-cycled back to the flotation cells for re-use. This filtrate is high in reagent content and is particularly useful as dilution …

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Bubble Size Effects in Coal Flotation and Phosphate Reverse …

The laboratory-scale coal flotation tests showed that, the combustible material recoveries for coarse fractions, -700+355 μm, and ultrafines fraction, -75 μm, were remarkably increased in the presence of pico-nano bubbles in coal flotation. The maximum combustible recovery of 85 to 90% and minimum clean coal ash of 9.5 to 11% were

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AU507430B2 - Increasing yield of deep mined coal using froth flotation …

AU507430B2 AU41771/78A AU4177178A AU507430B2 AU 507430 B2 AU507430 B2 AU 507430B2 AU 41771/78 A AU41771/78 A AU 41771/78A AU 4177178 A AU4177178 A AU 4177178A AU 507430 B2 AU507430 B2 AU 507430B2 Authority AU Australia Prior art keywords froth flotation increasing yield mined coal deep deep mined Prior art date Legal …

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Intensification of Coal Flotation by Means of Air Microbubbles

To study flotation with added microbubbles, we use regular GZhO coal (ash content 13%). To establish the influence of microbubbles on the results of flotation, we use minimal quantities of the flotation reagents in the experiments: 0.95 ± 0.05 kg/t collector (TS kerosene) and 0.15 ± 0.02 kg/t KOBS frothing agent (butyl-alcohol bottoms).

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Coal - BASF

BASF's diverse flotation range includes collectors, frothers, dispersants, and modifiers and is backed by a strong production platform of aliphatic alcohols, glycols and surfactants which makes BASF a natural partner for the coal …

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Method for the froth flotation of coal (Patent) | OSTI.GOV

Abstract. 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/-)-R/sub 2/ wherein R/sub 1/ and R/sub 2/ are independently saturated hydrocarbyls, the oxygen containing …

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Flotation Process - an overview | ScienceDirect Topics

Coal flotation is commonly carried out with a combination of an oily collector (e.g. fuel oil) and a frother (e.g. MIBC). All coal flotation systems require the addition of a frother to generate small bubbles and to create a stable froth (Table 12.2).

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Coal cleaning by froth flotation - Iowa State University

The order of addition of flotation reagents appeared very important for achieving a high recovery of Iowa coal;Appalachian coals floated rapidly with only a frother (methyl isobutyl carbinol) or an alkaline solution. A small amount of an oily collector increased the …

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Coal Flotation | SpringerLink

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. ...

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BASF Mining Solution Coal Flotation Mining

BASF's coal flotation solutions These formulations have shown the ability to deliver improvements on a range of coal types, including those traditionally difficult to float. BASF's extensive backward inte-gration into the building blocks of flotation chemistries enables us to effectively apply

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Coal Flotation - an overview | ScienceDirect Topics

In coal flotation, only collectors and frothers are generally used as chemical reagents. The collector enhances the hydrophobic property of coal. Kerosene or No 2 fuel oil are usually used as collectors, while aliphatic alcohols such as MIBC (methyl isobutyl carbinol) and glycols are normally used as frothers.

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Improve Coal Flotation Rate and Recovery - 911 …

In a conventional practice of a froth flotation operation, coal fines, the liquid form of frother, the collector such as kerosene or fuel oil, and/or a conditioner are mechanically stirred in a water solution. Then, the air bubbles are introduced into the pulp.

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Flotation - Mineral Processing & Metallurgy

FLOTATION CAPACITIES A normal capacity per standard roughing-cell is 50 tons per 24 hours. This, of course, will vary with the nature of the ore. In one plant that employs gravitation previous to flotation the fine sand and slime …

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DESIGN AND PERFORMANCE ASPECTS OF COAL FLOTATION …

Flotation is commonly used to treat fine coal (typically below 500 microns in size) and is a complex, three-phase process that is controlled by factors which can be divided into three facets: coal, chemistry and machine. It is most often used for treating metallurgical coal fines where the value of the product can justify the added ...

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Carrier Flotation of Low-Rank Coal with Polystyrene

The flotation experiments revealed that the optimum conditions were: collector dosage 5000 g/t, pulp concentration 40 g/L, and the ratio of low-rank coal to polystyrene 100:10. Under these conditions, the combustible …

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Flotation Reagents - Mineral Processing & Metallurgy

The flotation reagents can be added in a feed-forward fashion based on the plant raw coal tonnage. Automatic feedback control of the flotation reagent addition rates has been lacking due to the unavailability of sensors for determining the quality of the froth cell tailings.

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CAVITATION NANOBUBBLE ENHANCED FLOTATION …

FLOTATION PROCESS FOR MORE EFFICIENT COAL RECOVERY Froth flotation is a widely used, cost effective particle separation process. However, its high performance is limited to a narrow particle size range, e.g., between 50 µm and 600 µm for coal and between 10 µm and 100 µm for minerals. Outside this range, the

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A NOVEL APPROACH TO FLOTATION CELL DESIGN

coal flotation. The velocity vectors and attachment rates in the column are shown in Figure 4 and Figure 5 respectively. There is a general circulating

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(PDF) Physical and chemical interactions in coal flotation

Coal flotation is a complex process involving several phases (particles, oil droplets and air bubbles). These phases simultaneously interact with …

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Effect of Nanobubbles on the Flotation Performance of Oxidized Coal

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 ...

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COAL FLOTATION - Mineral Processing & Metallurgy

Coal flotation is a complex process involving several phases (particles, oil droplets and air bubbles). These phases simultaneously interact with each other and with other species such as the molecules of a promoting reagent and dissolved ions in water. The physical and chemical interactions determine the outcome of the flotation process.

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Pulp pH and coal flotation - A review | Request PDF

The chief chemical constituent in coal flotation pulp is the plant water, together with its content of salts and ions. The plant water is drawn from variety of sources. pH of this water is ...

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Enhanced Flotation Recovery of Fine Molybdenite Particles Using a Coal …

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 …

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A review on flotation of coal using mixed reagent systems

Coal flotation is a complex multiphase process governed by different sub-processes and interphase interactions. The coal cleaning efficiency by flotation is …

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Flotation froth recognition system based on machine vision

Coal flotation mainly uses the difference between the surface hydrophilicity and hydrophobicity of coal particles, caused by their interaction with reagents, which results in the separation of clean and tail coal from coal slime in the flotation machine or flotation column [1, 2]. In the flotation process, the reagent dosage is the main factor ...

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CN1038313C - Coal flotation process - Google Patents

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 ...

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BASF Mining Solution Coal Flotation Mining

our flotation product portfolio offers operational, economic and environmental advantages to the coal industry. robust performance with variation of plant feeds improved dewatering through coarse particle capture reduced dose rates site-specific formulations for increased yield integrated chemical portfolio reduces total cost of …

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Flotation - Mineral Processing & Metallurgy

The FLOTATION PROCESS is one of the commonest methods of extracting the valuable minerals from certain classes of ores, and it is generally more efficient as regards the recovery of the minerals than any other process …

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Coal Flotation and Fine Coal Utilization: Laskowski, J. S ...

This is the first monograph on the processing of fine coal which recognizes that all unit operations that handle fine coal depend on coal surface properties, and which in one single volume provides a comprehensive introduction to coal surface chemistry, using it rigorously in treating coal flotation fundamentals and engineering, fine coal ...

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Improvement of Low‐Rank Coal Flotation Based on the …

The experiments were conducted on organic matter, gangue, and raw coal and combined with surfactant adsorption/desorption capacity, FTIR, and wetting heat determination to explore the underlying mechanism. The best flotation performance of raw coal was obtained when desorption time was 30 s.