Advances in the Fundamentals of Fine Coal Filtration

Bourgeois, Florent; Barton, Wesley A.

doi:10.1080/07349349808945571

Cited by 13 publications

(4 citation statements)

References 7 publications

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“…1 The microstructure of filter cake has been shown to be responsible for the kinetics of cake formation and desaturation. 2 In general, small and compact aggregates seem to be more suited for filtration than large and loose aggregates, which tend to form compressible cakes and contain more intraparticle moisture. 3…”

Section: Introductionmentioning

confidence: 99%

Recycling polyethylene from automotive fuel tanks

Gorrasi¹,

Maio²,

Vittoria³

et al. 2002

J of Applied Polymer Sci

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Polyethylene (PE) from postuse automotive fuel tanks is considered a valuable material for mechanical recycling, and we assessed its properties, paying particular attention to transport properties and processability. The characterization included the study of the sorption-desorption isotherms, the rheological analysis of the molten materials and their processability. In particular, we obtained, sorption--desorption isotherms using a model molecule (nheptane) to simulate contact with the fuel. The measurements were carried out on films of PE blend for tanks and separately on the components of the blend. Rotational rheometry was carried out on scraps from used tanks and on virgin material for comparison. We performed some extrusion tests to evaluate the possibility of mechanical recycling of the postuse materials. In particular, we examined the melt-fracture incoming conditions by making use of a twinscrew extruder with a round die. Stress-strain measurements were carried out on films of virgin and used material, obtained with a press on a laboratory scale to evaluate the change of the mechanical properties of a manufacture obtained by reprocessing a polymer aged in contact with a mixture of liquids.

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Section: Introductionmentioning

confidence: 99%

Recycling polyethylene from automotive fuel tanks

Gorrasi¹,

Maio²,

Vittoria³

et al. 2002

J of Applied Polymer Sci

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“…The results are consistent with the previous studies. Bourgeois and Barton (1998) proposed that there is no cake microstructure that can provide both a high filtration rate and a low filter cake moisture. Tao et al (2003) reported that the anionic flocculant with high molecular weight could form larger flocs than the cationic flocculant, resulting in a faster filtration rate.…”

Section: Results Of Filtration Experimentsmentioning

confidence: 99%

Application of low-field NMR in the study of flocculant-aided filtration process of coal tailings

Zhi-min¹,

Liang²,

Hu³

2021

Physicochem. Probl. Miner. Process.

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Preconditioning of coal tailings with flocculants is a useful technology to improve filtration performance. In this study, anionic and cationic polyacrylamides were used for the pretreatment coal tailings before filtration. Nondestructive and rapid measurement of the filter cakes of coal tailings at different filtration stages was conducted using a nuclear magnetic resonance (NMR). The transverse relaxation time (T2) results of NMR provided the information concerned the state of water in filter cake, showing that free water entrapped in larger pores was removed mainly during coal tailings filtration, and the pressure in this study cannot remove the inherent moisture of filter cake of coal tailings. The significant increase in the amplitude of T2 value between 0.1 and 1.0 ms revealed that the flocs collapsed into smaller ones with water entrapped in them during filtration. Comparing the NMR results with different flocculants shows that anionic polyacrylamide of 800 g/Mg produced a larger structure in the initial stage of filter cake formation. The final filter cake entrapped more water. The NMR results well validated the filtration experiments.

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“…After the sample preparation, filtration and dewatering experiments were carried out, and the slurry samples were filtered using the single leaf filter test apparatus (Bourgeois et al , 1995), which enables filtration and dewatering tests to be carried out under controlled and reproducible conditions (Bourgeois and Barton, 1998). The filter cakes were produced using the single leaf filter test in the top loading mode to create a uniform cylindrical cake.…”

Section: Methodsmentioning

confidence: 99%

Effect of froth stability on dewatering of coal flotation concentrates

Wei

Peng

2015

Mineral Processing and Extractive Metallurgy

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This study was conducted to investigate the effect of froth stability on coal filtration and dewatering characteristics by comparing the filtration and dewatering responses of flotation concentrates and unfloated coal slurries. The results show that high froth stability originating from a flotation process has a negative impact on the filtration and dewatering of flotation concentrates. In this study, the flotation of fine coal using saline water produced a highly stable froth with a high air recovery resulting in a short cake formation time and a high final cake moisture content when the flotation concentrate was dewatered. The air bubbles entrained in the flotation concentrate blocked and resisted the flow of water during filtration and dewatering. The moderately and weakly stable froths produced from the flotation of fine coal using deionised water and coarse coal using saline water respectively did not affect the filtration and dewatering process.

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Advances in the Fundamentals of Fine Coal Filtration

Cited by 13 publications

References 7 publications

Recycling polyethylene from automotive fuel tanks

Recycling polyethylene from automotive fuel tanks

Application of low-field NMR in the study of flocculant-aided filtration process of coal tailings

Effect of froth stability on dewatering of coal flotation concentrates

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