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Flotation is an important part of coal preparation, and the flotation column is widely applied as efficient flotation equipment. This process is complex and affected by many factors, with the froth depth and reagent dosage being two of the most important and frequently manipulated variables. This paper proposes a new method of switching and …
At the same time, some research achievements have also been made in the process of strengthening the research on coal surface modification by collectors, such as oil bubble flotation [20], ultrasonic flotation [21]and conditioning flotation [22–23], which can improve the hydrophobicity of coal particle surface in varying degrees to solve the ...
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. ... Some scholars strengthen flotation by improving the fluid environment. 27−32 Wang et al. 30 proposed a new ...
Section snippets Materials. LRC samples were gathered from Coal Cleaning Industry of Meizhiyou in Shanxi province, China. To control for the surface heterogeneity effect of these LRC samples on the flotation results, large lumps of coal (less than 50 mm) with low densities (less than 1.3 g·cm −3) were separated using a heavy medium …
The action of inorganic reagents in coal flotation is analyzed, with a view to improving enrichment. Sulfates of calcium, magnesium, and iron most likely act by …
Particles, flotation reagents, and air bubbles are highly dispersed and interact with each other in a flotation cell. Therefore, a basic understanding on the fundamental mechanism of the above interactions involved in a low-rank coal flotation system is the prerequisite for improving low-rank coal flotation recovery.
A small amount of SCG (50 g/t) could improve the CMR of low-rank coal flotation, and increase the concentrate yield by about 12% with its ash content roughly unchanged. (2) Hydrophilic functional groups of SCG adsorbed with the hydrophilic sites on the coal surface through hydrogen bonds, leaving the hydrophobic ends exposed to the …
In rougher flotation, both the mechanical flotation cell and flotation column reduced the ash content of the graphite ore from 15.43% to 10.8%, while the yield of the flotation column (91.41%) was ...
Table of Contents. A unique collector dispersion techniques was developed and used to improve the flotation rate and recovery of coarser and ultrafine coal-rich particles in the froth flotation processes. In this novel collector dispersion method, the collector such as hydrocarbon-oil is gasified and transported by gas phase (air stream) …
In this study, carrier flotation was used to improve the flotation performance of low-rank coal with polystyrene as a carrier material. Kerosene was used as a collector and played a role in the adhesion of …
Abstract The action of inorganic reagents in coal flotation is analyzed, with a view to improving enrichment. Sulfates of calcium, magnesium, and iron most likely act by diminishing the hydration of coal particles as a result of the surface adsorption of cations. The positive influence of a natural salt solution consisting primarily of NaCl on coal …
How to improve coal flotation performance has been examined with a focus on the effect of particle size on flotation conditioning. A coking coal sample collected from the …
Coal flotation is the most proficient technique used to improve the nature of fine particles by diminishing pollution substance (Majumder and Barnwal, 2011). The hypothesis of froth flotation is complex and has not been fully comprehended.
Even though the surfactants are good at improving the flotation of low rank coal and somewhat can be used as the collectors in low rank coal flotation. The oily collectors are still essential for coal flotation because the surfactants may be non-selective [18], [30]. Therefore, a method to oxidize the conventional oily collectors into ...
It was found that coal flotation performance decreased with an increase in the degree of surface oxidation. A critical degree of coal surface oxidation was …
2 rowsTo improve the flotation efficiency, achieving the clean production of fine coal, a new method ...
This study investigated the influence of PVP on the efficient separation of ultrafine coal. The poor flotation performance of ultrafine coal can be attributed to the initial high ash content and ultrafine grain size. PVP was used to adjust the process before flotation and improve the flotation performance.
1. Introduction. Low-rank coal is an important fuel and material for power and coal chemical industry (Hao et al., 2017; Yuan and Xu, 2019), it is necessary to improve the quality of low-rank coal for efficient and clean production (Çelik et al., 2019).Flotation is an effective way to separate fine particles based on the physicochemical differences of …
By investigating flotation kinetics, the flotation process and coal flotation time can be optimized while drastically reducing the energy consumed during coal flotation [36]. ... Improving coal flotation using the mixture of candle soot and hydrocarbon oil as a novel flotation collector. J Cleaner Prod, 195 (2018), pp. 1183-1189.
To improve the flotation efficiency, achieving the clean production of fine coal, a new method using impact flow conditioning pulp to enhance coal flotation was proposed. Furthermore, the flotation intensification mechanism using impact flow conditioning pulp was studied by SEM-EDS, adsorption measurements, contact angle …
Effective regulation reagents are essential in low-rank coal flotation for improving the floatability of ultrafine particles. Polymer regulators have great potential in the surface …
Accordingly, the contact angle of raw coal is low, which indicates that the low-rank coal is difficult to float. The flotation results showed that the flotation of low-rank coal in the presence of carboxylic acid contributed to better flotation performance than that obtained by alkane, which indicated that carboxylic acid can be more effective ...
Novel reagents for the modernisation of coal flotation Despite improving the flotation efficiency, the above-mentioned methods are complicated. Thus, researchers employ novel flotation reagents to develop the flotation of low-rank coal, which can remove the oxygen-containing groups from the surface of low-rank coal.
The flotation of low-rank coal suffers poor efficiency with hydrocarbon oils unless it is at a high dose. A representative non-polar oil, diesel oil (DO), was used as a collector to float a long-frame coal. The feasibility of oxidized paraffin soap (OPS) was explored to improve flotation performance.
Therefore, the separation of unburned carbon from coal fly ash is vital in improving the utilization rate of coal fly ash and in saving energy. Electrostatic separation [12], [13], [14], gravity separation [15], froth flotation [16], [17], [18], oil agglomeration [19], and a combination of processes [20], sometimes in multiples stages [21] are ...
The conditioning-flotation experiments were performed to reveal the effect of the impact flow conditioning pulp with different impact velocities on coal flotation. The SEM-EDS analysis confirmed that the impact flow conditioning pulp could remove the coating covering the coal surface and improve the separation performance of coal from gangue.
To improve the separation, a ing agent and a collecting agent that improves particle adhesion to bubbles are often added [24,25]. Froth flotation is widely used in mineral processing and coal preparation industry . The traditional Denver flotation cell has been used for the separation of unburned carbon in laboratory scale fly ash . The ...
The PEO/PPO/PEO triblock co-polymers were also found to improve coal flotation and the mechanism of polymer action was a function of the coal rank Polat and Chander, 1995, Polat and Chander, 1998, Polat and Chander, 1999, Polat et al., 1994a, Polat et al., 1994b, Polat et al., 1997, Chander, 1997. These reagents had double effect …
As the reserves of high-quality coal resources in China are decreasing, it is imperative to improve the processing and comprehensive utilization of low-rank coal. In this study, NaNO2 was used for the flotation pretreatment test of the low-rank coal obtained from Majialiang, and the mechanism was discussed by contact angle analysis, zeta …
Novel reagents for the modernisation of coal flotation Despite improving the flotation efficiency, the above-mentioned methods are complicated. Thus, researchers employ novel flotation reagents to develop the flotation of low-rank coal, which can remove the oxygen-containing groups from the surface of low-rank coal.
Therefore, it is necessary to strictly control the concentration of DTAB to improve the flotation performance of low-rank coal. The effect of DTAB on low-rank coal flotation using dodecane collector was investigated through experimental analysis, as described in the following sections. In addition, the positive effect of DTAB on the …
It is of great interest to improve the flotation of coal with a high content of fine slurries by management based on simulation. If the coal's content of fine slurry is …
How to improve coal flotation performance has been examd. with a focus on the effect of particle size on flotation conditioning. A coking coal sample collected from the flotation feed of a coal prepn. plant located in Lu'an, Shanxi province of China was investigated. The characters including mineral compn., size fraction, d. fraction, and ...
Particles, flotation reagents, and air bubbles are highly dispersed and interact with each other in a flotation cell. Therefore, a basic understanding on the fundamental mechanism of the above interactions …
To improve the efficiency of the coal flotation, the oil collectors must undergo three steps, namely, adsorbed at the surface, spread at the surface, and promote adhesion of the particle to the bubble [40]. Therefore, adhesion and spreading of the collectors play a significant role in the flotation. Generally, having been added to the …
