reagents for enhanced coal flotation

reagents for enhanced coal flotation

Chemical Reagents for Enhanced Coal Flotation: Coal ...

Apr 21, 2014  Chemical Reagents for Enhanced Coal Flotation. Designing new reagents is of vital importance for the flotation of coal, especially for processing low-rank and/or oxidized coals, which are difficult to float with commonly used fuel oil or kerosene because of the high surface oxygen content. Because of the complex nature of coal surfaces, both ...

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2 REAGENTS IN COAL PREPARATION: WHERE DO THEY GO?

chemicals commonly used in coal flotation, and examine implications for water management (e.g., in closed-loop systems). Additionally, we discuss the usefulness of such data in predicting ... and the combined result is enhanced sedimentation (Wills 2006). Defoaming or anti- ... effects of reagents on coal recoveries and yields, it is becoming ...

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Flotation Reagents - Mineral Processing Metallurgy

Jun 08, 2016  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. Expensive nuclear-based sensors have been tried with limited success.

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COAL FLOTATION - Mineral Processing Metallurgy

May 23, 2017  Since the non-ionic surfactants contain a relatively small portion of polar groups in their structure, the flotation results for both coals indicates that these polar groups may play an important role in the interaction of the reagents with the surface of the coal. This interaction may be enhanced if the surface of the coal contains numerous ...

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CAVITATION NANOBUBBLE ENHANCED FLOTATION PROCESS

CAVITATION NANOBUBBLE ENHANCED 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.

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Mechanism of effect of apolar and heteropolar reagents in ...

Abstract. An investigation of the effects of apolar and heteropolar reagents on the flotation cleaning of coal was presented. To determine the effect of the reagents on the wettability of the surfaces of coal particles, the forces of detachment of coal particles from air bubbles were measured.

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US4308132A - Bituminous coal reagent and flotation process ...

A reagent and a method for using the reagent for treating a solid material disposed in a liquid medium and having an oxygen-controlled surface condition. The reagent includes a liquid hydrocarbon, a reducing material and an activator material. The liquid hydrocarbon has a specific gravity different from the specific gravity of the liquid medium.

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Recent advances in effective collectors for enhancing the ...

Sep 01, 2017  Xie et al. used a new emulsified flotation reagent for enhancing 1/3 coking coal flotation. The new emulsified flotation reagent was prepared by 3% flotation promoter (synthesized with natural cottonseed oil and industrial by-products), 27% diesel oil and 70% water.

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Coal cleaning by froth flotation - Iowa State University

Floatability of Coal and Pyrite 30 Flotation Characteristics of Iowa Coal 32 Variables of Coal Flotation 34 Particle size 34 Flotation reagents 36 Pulp density 38 Pulp pH 39 Agitator speed 39 Separation of Pyrite from Coal 40 Wet oxidation pretreatment 41 Ultrasonic vibration 44 Chemical comminution 46 Micro-bubble flotation 48

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Ultrasound-electrochemistry enhanced flotation and ...

Mar 01, 2021  Besides, the mechanism of ultrasound-electrochemistry enhanced flotation and desulphurization for fine coal is analyzed. Results show that when anhydrous ethanol dosage, ultrasonic treatment time, electrolysis current, and ultrasonic power are 30 ml, 20 min, 1.5 A, and 250 W respectively, the desulfurization rate and cleaned coal yield of ...

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Reagent for coal flotation (Journal Article) OSTI.GOV

An investigation was made on the effects of the properties of reagents on their flotation activity in the flotation cleaning of coal. The extraction of fuel matter in the concentrate was used as the measure of flotation activity. The effects of density, viscosity, and boiling point on the flotation ...

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2 REAGENTS IN COAL PREPARATION: WHERE DO THEY GO?

chemicals commonly used in coal flotation, and examine implications for water management (e.g., in closed-loop systems). Additionally, we discuss the usefulness of such data in predicting ... and the combined result is enhanced sedimentation (Wills 2006). Defoaming or anti- ... effects of reagents on coal recoveries and yields, it is becoming ...

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Flotation Reagents - Mineral Processing Metallurgy

Jun 08, 2016  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. Expensive nuclear-based sensors have been tried with limited success.

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US4308132A - Bituminous coal reagent and flotation process ...

A reagent and a method for using the reagent for treating a solid material disposed in a liquid medium and having an oxygen-controlled surface condition. The reagent includes a liquid hydrocarbon, a reducing material and an activator material. The liquid hydrocarbon has a specific gravity different from the specific gravity of the liquid medium.

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FLOTATION OF CARBONACEOUS MATERIAL WITH

gents used in coal flotation and issues of flotation of finely dis-persed coal are considered. The flotation tests on different grade coal from the Kuznetsk Coal Basin show an increase up to 12% in recovery and yield of valuable components in concentrate as com-pared with the common reagents. Moreover, the flotation rate be-comes 2 times higher.

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Reagent collector for flotation of coal

Density at 20 o C, g/cm 3 - 0,9260-0,9580. The proposed reagent is a collector, which is gaining traction on the surface of coal particles, hydrofobicity it and provides flotation. The reagent contains only 18,0-20,0% saturated hydrocarbons, which is fixed on the surface of the coal as a result, only non-specific molecular interactions.

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CAVITATION PICOBUBBLE ENHANCED FLOTATION PROCESS

improved flotation recovery of difficult-to-float coal particles and reduced reagent cost, which is often the largest single operating cost in commercial coal washing plants. Application of this process to coal flotation resulted in an increase in the overall flotation yield of up to 20% or higher, a collector dose

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Recent advances in effective collectors for enhancing the ...

Sep 01, 2017  Xie et al. used a new emulsified flotation reagent for enhancing 1/3 coking coal flotation. The new emulsified flotation reagent was prepared by 3% flotation promoter (synthesized with natural cottonseed oil and industrial by-products), 27% diesel oil and 70% water.

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Improve Coal Flotation Rate and Recovery - 911 Metallurgist

Sep 21, 2018  These reagents in liquid forms are directly added into the coal pulp in froth flotation systems. Frequently, a conditioning tank is required to achieve the dispersion of the reagents. Experimental. The air-dried raw coal sample was crushed in a jaw crusher and a double roll crusher.

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US4452714A - Bituminous coal reagent and flotation process ...

US4452714A US06/030,080 US3008079A US4452714A US 4452714 A US4452714 A US 4452714A US 3008079 A US3008079 A US 3008079A US 4452714 A US4452714 A US 4452714A Authority US United States Prior art keywords reagent oxygen coal bituminous coal flotation Prior art date 1977-09-30 Legal status (The legal status is an assumption and is not a legal conclusion.

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Reagent efficiency essential in coal flotation

Oct 21, 2005  In hard coal flotation, reagents are required to: n increase natural hydrophobic properties of the coal surfaces; n provide for selective separation of mineral substances, such as sulphur; and n ...

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Bubble Size Effects in Coal Flotation and Phosphate ...

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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The Effects of Conditioning Time on the Flotation of ...

Chemical Reagents for Enhanced Coal Flotation. Renhe Jia et al. Coal Preparation. Volume 22, 2002 - Issue 3. Published online: 15 Sep 2010. Article. Improving oxidized coal flotation by colloid mill pretreatments. B. Wen et al. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects.

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Enhanced pyrite rejection in coal flotation (Book) OSTI.GOV

Dec 31, 1994  Difficulties in rejecting pyrite from coal by flotation primarily result from two mechanisms of particle recovery: attachment and middlings. Attachment of pyrite is the consequence of surface hydrophobicity induced by superficial oxidation; middlings that can float readily are caused by incomplete ...

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SINGLE REAGENT FOR COAL FLOTATION

were conducted at a coal preparation plant in eastern India. The results of plant trials using this single reagent, Sokem 590C, are highly encouraging and economical as compared to diesel-frother system and this single reagent is nonpetroleum based and - biodegradable. Keywords: Coal flotation, diesel, frother, single reagent, Sokem 590C.

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Influence of Reagent Emulsification on Coal Flotation in ...

Apr 30, 2021  In Fig. 2, we show the results of traditional flotation (reagent emulsion + coal suspension + flotation bubbles) and flotation with the inclusion of gas microbubbles.With increase in impeller speed from 1000 to 3000 rpm, the concentrate yield increases by a factor of 1.3. Further decrease in size of the reagent droplets does not intensify flotation.

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Investigation of the influence of foaming reagents of ...

It has been established that to obtain high indicators of coal flotation products, it is necessary to apply the technical product of petrochemistry Oxal T-80 as a blowing agent reagent. Its application allows to increase the extraction of combustible mass in concentrate by 1.9-2.5% and reduce the loss of organic matter of coal with flotation waste.

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Performance Mining Reagents - SNF Holding Company

units for specialty mining reagents, FloMin, Inc. is well positioned to service all of your mining reagent needs. ... Certain product mixtures are particularly useful as flotation reagents; specifically collectors in the flotation of molybdenum-bearing copper ores, where molybdenum ... and enhanced oil recovery, while respecting the environment ...

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The Effect of Pre-Wetting With Flotation Reagents on the ...

(1994). The Effect of Pre-Wetting With Flotation Reagents on the Surface Energy of Coals. Coal Preparation: Vol. 15, No. 1-2, pp. 25-34.

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Coal flotation in a low-rank carbonaceous mineral using 3 ...

Synergistic adsorption of polar and nonpolar reagents on oxygen-containing graphite surfaces: Implications for low-rank coal flotation Journal of Colloid and Interface Science 10.1016/j.jcis.2019.09.025

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Enhanced flotation reagents for beneficiation of phosphate ...

Oct 15, 1997  Enhanced flotation reagents for beneficiation of phosphate ores. United States Patent 5962828. Abstract: An improved phosphate ore beneficiation process is disclosed which comprises the employment of a novel combination of surfactants which, when combined with fatty acid collectors, enhances recovery of phosphate minerals in anionic flotation ...

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EFFECT OF TWO-STAGE STIRRED PULP-MIXING ON COAL

strengthen the energy input to the stirred system, thereby improving the mixing efficiency of flotation reagents and coal particles in the pulp. The two-stage stirred pulp-mixing significantly increased the flotation feed rate of the cyclone-static micro-bubble flotation column and concentrate yield, enhanced

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Coal Flotation Technical Review - ACARP

Reagent consumption, according to conventional wisdom, accounts for 50-60% of flotation operating costs. Column flotation is expected to require more reagents on account of the much larger bubble surface available. This was found to be true, with frother consumption about double the rates used in conventional flotation.

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Upgrading difficult-to-float coal using microemulsion ...

May 01, 2012  Oxidized coals are difficult to float. Therefore, in this paper, a special flotation procedure was investigated for upgrading this type of coal. The procedure is called direct contact flotation. It relies on mixing dry coal either with pure (anhydrous) flotation reagent(s) or microemulsion. By applying the new direct contact flotation procedure, a coal yield reaching > 95% using anhydrous ...

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Mining and Mining Chemicals - InterChem

InterChem is a leading chemicals supplier and mining solutions provider to the mining industry. We provide a dependable and proven range of quality mining reagents, from solid and bulk liquid commodities, through to more specialised, tailored products for supply to a large customer base. We specialise in mining chemicals for flotation, mineral ...

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US Patent for Coal flotation process Patent (Patent ...

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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US5443158A - 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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Control of clay minerals effect in flotation. A review

the fine coal flotation process [14]. According to the results a clean coal product of 8-8.5% ash was produced from a feed of more than 19% ash with 97-98% combustible recovery. Binders significantly enhanced flotation selectivity, reducing clean coal ash from 8-8.5% to 7-7.5%. Also, flotation

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