Effect of slurry conditioning on flocculant-aided filtration of coal tailings studied by low-field nuclear magnetic resonance and X-ray micro-tomography

Hu, Pengfei; Liang, Long; Xie, Guangyuan; Zhou, Shaoqi; Peng, Yaoli

doi:10.1016/j.ijmst.2020.07.008

Cited by 53 publications

(10 citation statements)

References 28 publications

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“…The filter cake porosity is one of the most important factors affecting the filtration rate of coal slurry [ 24 ]. The pores of the filter cake, according to the pore size, could be classified as micropores (0–10 nm), transition pores (10–100 nm), mesopores (100–1000 nm), and macropores (>1000 nm) [ 41 ].…”

Section: Resultsmentioning

confidence: 99%

“…Nuclear magnetic resonance occurred when the hydrogen protons were activated by a static magnetic field and exposed to a second oscillating magnetic field. The pore size and pore throat distribution of the filter cake were indicated by assessing the intensity of hydrogen protons in water [ 24 , 25 ]. An amount of 1 g of sample taken from the center of the filter cake was put into the L-F NMR tube and sealed to prevent water loss during the pore testing.…”

Section: Experiments and Methodsmentioning

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%

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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“…Moreover, it is common knowledge that mineable mineral resources are developed. The grade will inevitably decrease as a natural progression of the process (Hu et al, 2020;Cai et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Role of ammonium phosphate in improving the physical characteristics of malachite sulfidation flotation

Ibrahim¹,

Jia²,

Cai³

et al. 2023

Physicochem. Probl. Miner. Process.

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In this study, ammonium phosphate ((NH4)3PO4) was employed to realize improvement by modifying the physical characteristics of the malachite surface, ensuring sustainable flotation throughout the flotation operations, and enhancing the flotation process to be more stable. Furthermore, various techniques, including X−ray photoelectron spectroscopy, were intensely used to investigate the configuration and physico-chemical surface characteristics through micro-flotation experiments, contact angle and zeta potential measurements, and XRD, ToF−SIMS, EPMA, and FTIR spectrum analyses. The FTIR findings showed that new characteristic peaks of −C(=S)−N.H. groups formed and adsorbed on the surfaces of malachite at 1636 cm-1. The −CH2 groups throughout the flotation process, further promoted the attachment of the CH3 ligand to the Cu2+ ion, and the XPS analysis confirmed this. Consequently, it can be concluded that (NH4)3PO4 played a substantial part in the improved recovery rate, as demonstrated and confirmed by the methods carried out in this study. Thus, it was used to modify the physical properties surface before adding Na2S to efficiently enhance malachite floatability and reduce the loss rate of malachite. Regarding the alterations in the physical characteristics which occurred to the malachite surface, and as a consequence of increasing the recovery results of flotation, the malachite sample treated initially with (NH4)3PO4 exhibited micro flotation results with a considerably greater flotation recovery than malachite treated initially with only Na2S ions.

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“…6–8 Specifically, huge amounts of solid waste such as ash are produced and toxic chemicals such as heavy metals, nitrate and sulphur are emitted during the direct incineration process of low-rank coal. 9–13 Also, excessive harmful gases such as NOx and SOx are also released during the production of electricity from low-rank coal, resulting in a further contribution to acid rain, skin problems, etc. 14–16 It is noteworthy to mention that over 10 Gt of CO 2 and about one-fifth of total greenhouse gases in the world are emitted each year due to the combustion of coal in power plants across the globe, making it the single largest cause of climate change.…”

Section: Introductionmentioning

confidence: 99%

Diverse utilization of surfactants in coal-floatation for the sustainable development of clean coal production and environmental safety: a review

Kumar

Das

Garain³

et al. 2022

RSC Adv.

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Effect of slurry conditioning on flocculant-aided filtration of coal tailings studied by low-field nuclear magnetic resonance and X-ray micro-tomography

Cited by 53 publications

References 28 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

Role of ammonium phosphate in improving the physical characteristics of malachite sulfidation flotation

Diverse utilization of surfactants in coal-floatation for the sustainable development of clean coal production and environmental safety: a review

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