Effect of a starch-based filter aid on the dewatering of fine clean coal

Gong, Guanqun; Xie, Guangyuan; Zhang, Yingjie; Wang, Ziliang; Wang, Jin; Ling-hui, Xie; Z, Luo

doi:10.1016/s1674-5264(09)60258-1

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…Filtration is a solid-liquid separation technology widely used in various fields such as papermaking, industrial water recycling, and sewage sludge treatment (Jean-Paul, 1993;Gong et al, 2010;Dash et al, 2011;Qi et al, 2011). The filtration process is also essential for dewatering the coal tailings due to the practical, economic and environmental advantages (Attia and Yu, 1991;Tao et al, 2000).…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…In recent years, the application of filter aids and surfactant on phosphoric acid has been paid more attention by many investigators. Effect of a starch-based filter aid on the dewatering of fine clean coal has been studied, which showed that adding an appropriate amount of filter aid to the slurry decreases the surface tension of the water and speeds up flocculation and coagulation [2]. The interacting between a surfactant and a high molecular polymer and filter aid effect has been studied, which showed that the final moisture content of filter cakes was decreased from 23.56% to 14.84% by using filter aid.…”

Section: Introductionmentioning

confidence: 99%

Performance Study of Nonionic Filter Aid on Wet-Process Phosphoric Acid

Fei

et al. 2013

AMR

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A non-ionic copolymer PAMA which has two functions of flocculation and surface activity was synthesized in aqueous solution. The copolymer was also characterized by means of infrared spectroscopic and unclear magnetic. The application performance of PAMA were studied, and the results show that the filtration rate of the phosphoric acid can be increased by about 3.8 times,the water content of the filter cake can be reduced by about 9.8%. Meanwhile, PAMA may increase the cake porosity by 25.82%,increase the mean void area about 7 times ,increase the surface contact angle of phophogypsum by 9.8°and decrease the surface tension by 7.4 mN·m-1 according to the SEM photos and hydrophobic experiment. All this confirms that PAMA is useful for vacuum filter system of wet process phosphoric acid.

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“…Dewatering characteristics can be improved by using filtration aids. The filtration aids include both flocculants and dewatering surfactants [5,6,7]. In flocculation, fine particulates suspended in liquid, interact with the flocculating agent and consequently aggregate to form flocs which settle rapidly under the influence of gravity.…”

Section: Introductionmentioning

confidence: 99%

Optimization Studies on Flocculant Aided Filtration of Very-Fine Grained Alkaline Leach Slurry Using Central Composite Rotatable Design

Serajuddin

Sreenivas

2013

AMR

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This paper discusses filtration behavior of very-fine grained alkaline leach slurry containing dissolved uranyl carbonate using commercial flocculants and dewatering surfactants. Evaluation of the best combination of flocculant and surfactant was made on the basis of capillary suction time (CST) data. Addition of INDFLOC 477 and CTAB to the alkaline leach slurry reduced the CST to 17 seconds from a very high level of 177 seconds obtained without the addition of any filtration aids. Detailed optimization of critical parameters like dosages and temperature of filtration were carried out on INDFLOC 477 and CTAB reagent combine adopting central composite rotatable design of experimentation to obtain maximum rate of filtration with minimum cake moisture. The studies indicated scope of achieving filtration rate of about 695 kg/h.m2 with 23% cake moisture upon addition of 167 g/t of INDFLOC 477 and CTAB at filtration temperature of 600 C.

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Effect of a starch-based filter aid on the dewatering of fine clean coal

Cited by 4 publications

References 3 publications

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

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

Performance Study of Nonionic Filter Aid on Wet-Process Phosphoric Acid

Optimization Studies on Flocculant Aided Filtration of Very-Fine Grained Alkaline Leach Slurry Using Central Composite Rotatable Design

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