Filtration of coal tailings aided by a novel physical conditioner carbon–containing fly ash

Hu, Pengfei; Liang, Long; Wang, Wei; Li, Yijiang; Xie, Guangyuan

doi:10.1080/15567036.2020.1808740

Cited by 3 publications

(3 citation statements)

References 34 publications

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“…Generally, when the chord length value increases, it indicates an increase in flocculation occurrence and floc size. Conversely, when the chord length decreases, it indicates that the particles in the suspension are uniformly dispersed and no flocculation is occurring [ 26 ]. The chord length distribution of the slurry under different pretreatment conditions is shown in Figure 14 .…”

Section: Resultsmentioning

confidence: 99%

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Effect of Ultrasonic Pretreatment on Flocculation Filtration of Low-Rank Coal Slurry

Yang

Liao

et al. 2022

Molecules

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The efficient filtration of low-rank coal (LRC) slurry was significantly beneficial to the production process of wet coal beneficiation. However, relatively few studies have been reported on novel pretreatment methods for the efficient filtration of LRC slurry. In this paper, the mechanism of ultrasonic pretreatment to promote flocculation and filtration of slurry was studied. The hydrophobic variation of the slurry surface was measured by contact angle and XPS. The flocculation properties of slurry were characterized using zeta potential and FBRM. The effects of filter cake porosity and ultrasonic pretreatment on slurry filtration resistance were calculated by L-F NMR and Darcy’s theory. The results showed that the ultrasonic pretreatment promoted the flocculation and filtration performance of LRC slurry, increased the filtration rate, and decreased the cake moisture content. Meanwhile, the contact angle of LRC increased significantly from 50.1° to 67.8° after ultrasonic pretreatment, and the surface tension of the filtrate decreased from 69.5 to 53.31 mN/m. Ultrasonic pretreatment reduced the absolute value of the zeta potential of coal slurry from 24.8 to 21.0 mV, and the average chord length of flocs increased from 5–10 μm to 25–30 μm, thus weakening the electrostatic repulsion between coals to promote floc formation. In addition, the pore tests and filtration theory calculations showed that the ultrasonic pretreatment significantly improved the permeability of the filter cake to water and reduced the resistance to slurry during filtration. In particular, the mesopore porosity increased by 9.18%, and the permeability increased by 2.937 × 108 m2. Therefore, this contributed to the reduction of slurry filtration resistance. This research provides an efficient method for promoting the efficient filtration of slurry.

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Section: Resultsmentioning

confidence: 99%

“…The resonance frequency of the equipment was 12.5 MHz. The temperature of the magnets of L-F NMR was kept constant at 32 °C [ 26 ].…”

Section: Experiments and Methodsmentioning

confidence: 99%

Effect of Ultrasonic Pretreatment on Flocculation Filtration of Low-Rank Coal Slurry

Yang

Liao

et al. 2022

Molecules

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“…The value of the chord length often indicates a surge in flocculation production and floc size. On the other hand, if the chord length shrinks, its emphases how evenly distributed the particles in the solution are and that flocculation has not developed (Hu et al, 2020). A total of 250 ml water beakers filled with 10 g of coal sample added CPAM, NPAM, APAM, sodium silicate and sodium oleate and stirred at 400 r/min for five minutes.…”

Section: Focused Beam Reflectance Measurement (Fbrm)mentioning

confidence: 99%

Study on Improving Flotation Effect and Mechanism of Fine Anthracite by Polyacrylamide, Sodium Silicate and Sodium Oleate

Rahman

Dong

2023

ejtas

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The flotation performance of clean coal with different reagents and pretreatment agents was investigated. The study examines the efficient recovery of anthracite coal using polyacrylamide flotation pretreatment. The mechanism of pretreatment agents and anthracite was investigated using Fourier transform infrared spectroscopy (FTIR), zeta potential measurements and focused beam reflectance measurement (FBRM). The wetting behavior and flotation performance of anthracite and pretreatment agents were investigated using contact angle measurements and series of flotation tests. The coal samples were treated with reagents like kerosene, sec-octanol and pretreatment agents like polyacrylamides, (cat-ionic polyacrylamide, non-ionic polyacrylamide, an-ionic polyacrylamide), sodium silicate and sodium oleate to investigate their impact on coal surface properties and the subsequent flotation performance. The optimum dosage of kerosene was found to be 10 kg/t and that of sec-octanol was 1.84 kg/t. Moreover, the optimum dosages of cat-ionic polyacrylamide, sodium oleate and sodium silicate were 200 g/t, 350 g/t and 500 g/t respectively. The yield of clean coal of cat-ionic polyacrylamide was 70.70 %, ash content of clean coal of cat-ionic polyacrylamide was 11 %. The sodium silicate (Na2SiO3) has the yield of 66.66 % and the ash content of 13.9 %. The results indicated that the cat-ionic polyacrylamide demonstrated the most substantial improvement in flotation performance, particularly when used in conjunction with kerosene and sec-octanol.

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Floc structure and dewatering performance of kaolin treated with cationic polyacrylamide degraded by hydrodynamic cavitation

Zhou

Alheshibri

et al. 2021

Chemical Engineering Communications

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Filtration of coal tailings aided by a novel physical conditioner carbon–containing fly ash

Cited by 3 publications

References 34 publications

Effect of Ultrasonic Pretreatment on Flocculation Filtration of Low-Rank Coal Slurry

Effect of Ultrasonic Pretreatment on Flocculation Filtration of Low-Rank Coal Slurry

Study on Improving Flotation Effect and Mechanism of Fine Anthracite by Polyacrylamide, Sodium Silicate and Sodium Oleate

Floc structure and dewatering performance of kaolin treated with cationic polyacrylamide degraded by hydrodynamic cavitation

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