Application of Enhanced Vacuum Filtration to Dewatering of Fine Coal Refuse

Cheng, Yisun; Fang, Shaohua; Tierney, J.W.; Chiang, S.H.

doi:10.1080/01496398808075686

Cited by 3 publications

(5 citation statements)

References 4 publications

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“…This type of sediment can be differentiated from previous sediments by not showing a clear interface between the sediment layer and the solvent above it. [ 15,19 ]…”

Section: Resultsmentioning

confidence: 99%

“…Both the basal plane and the peripheral surface of kaolin were negatively charged at this pH with a zeta potential of À42 ± 0.2 mV (Scheme 1). [4,[15][16][17] Figure 3 represented the impact of added polycation on the zeta potential and residual turbidity of the kaolin samples. A remarkable increase in zeta potential (À46-+24 mV) was observed after polyelectrolyte addition (PDADMAC), which is the result of electrostatic attraction between the positively charged polymer and negatively charged surface of the kaolin particles.…”

Section: Flocculation Of Kaolin By Pdadmacmentioning

confidence: 99%

“…The destabilization of the system may be the result of the neutralization of the surface charge of the particles by the polymer adsorption, which may have led to the formation of additional adsorption layers by the hydrogen or hydrophobic binding mechanism. [15] Kaolin suspension flocculation caused by PDADMAC occurred in a narrow range of PDADMAC concentrations (0. 1-0.15 mg/g).…”

Section: Flocculation Of Kaolin By Pdadmacmentioning

confidence: 99%

“…This type of sediment can be differentiated from previous sediments by not showing a clear interface between the sediment layer and the solvent above it. [15,19] F I G U R E 4 Settling rates of kaolin suspension as a function of PDADMAC concentration. S C H E M E 2 Schematic presentations of functional groups in dependence on pH [23] .…”

Section: Settling Behavior Of Kaolin Suspension and Optimum Dose Of P...mentioning

confidence: 99%

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Impact of mechanochemical treatment on surface chemistry and flocculation of kaolinite dispersion

Bhatti

Baloch

Schwarz

et al. 2023

Asia-Pacific J Chem Eng

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For many industrial applications, an extensive research of the stabilization and destabilization mechanisms of aqueous suspensions of fine particles is crucial. The flocculation of charged particles from their aqueous suspensions is greatly influenced by the surface characteristics of the particles. For the purpose of improving the flocculation efficiency of kaolin suspensions, the impact of the proposed mechanochemical treatment, which includes homogenization and/or ultrasonication followed by the addition of polycation such as poly (diallyl dimethyl‐ammonium chloride) (PDADMAC), was examined under standard conditions. It was demonstrated that parameters including kaolin's specific surface area, surface charge density, and particle size reduction are all affected by the duration of the ultrasonication. While ultrasonication (10 min) has a significant impact on particle size distributions, 300 and 200 nm‐sized particles were also seen. A narrow flocculation window was obtained by PDADMAC at a Cp/Cs ratio of 0.1 mg/g (Cp/Cs means the ratio of mass polymer/mass substrate), while the mechanical treatment via homogenization with magnetic stirring (60 min) resulted in a larger flocculation window of kaolin caused by the polyelectrolyte used. However, mechanochemical treatment via ultrasonication followed by the addition of aforementioned polyelectrolyte played a significant role in achieving the highest turbidity removal. Hence, the settling behavior of kaolin suspension depends upon the pH, ultra‐sonication time, and the concentration of polyelectrolyte. The combination of ultra‐sonication, PDADMAC dosage, and pH (mechanic‐chemical treatment) played an excellent role in the maximum removal of turbidity, and the broadest flocculation window comprising of 0.4 to 1.6 mg/g was observed at pH 8.

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“…This type of sediment can be differentiated from previous sediments by not showing a clear interface between the sediment layer and the solvent above it. [ 15,19 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Flocculation Of Kaolin By Pdadmacmentioning

confidence: 99%

Section: Flocculation Of Kaolin By Pdadmacmentioning

confidence: 99%

Section: Settling Behavior Of Kaolin Suspension and Optimum Dose Of P...mentioning

confidence: 99%

See 2 more Smart Citations

Impact of mechanochemical treatment on surface chemistry and flocculation of kaolinite dispersion

Bhatti

Baloch

Schwarz

et al. 2023

Asia-Pacific J Chem Eng

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show abstract

“…The application of synthetic polymer flocculants is quite common in coal and refuse dewatering because of their effectiveness at lower dosage. A number of workers investigated the application of anionic, nonionic, and cationic polymers [47][48][49][50]. The flocculants used are generally copolymers of acrylamide and sodium acrylate.…”

Section: Effect Of Flocculantsmentioning

confidence: 99%

Determination of Free and Bound Water in Fine Coal Filter Cake

Patil¹,

Parekh²

2004

Coal Preparation

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The bound water in fine coal filter cake represents the water that cannot be removed using mechanical dewatering techniques. The amount of bound water in a fine coal filter cake, in other words, represents the moisture content achievable by an ideal dewatering technique. In this study the dilatometer technique was used to measure the bound and free water in a fine coal filter cake. Results showed that addition of cationic (0.25 kg=t) and non-ionic (1 kg=t) surfactants reduced the bound water content in the filter cake from 13.73% to 3.72% and 8.28%, respectively. Decrease in bound water content was attributed to the adsorption of surfactants on the coal surface, which increased the coal hydrophobicity. Addition of 10 g=t of cationic and anionic flocculants also reduced the bound water content from 13.73% to 4.58% and 6.63%, respectively, which was attributed to the replacement of surface water molecules with the polymer. Based on the free and bound water data, ideal dewatering curves were developed for both surfactants and flocculants.

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Effect of gas nuclei on the filtration of fine particles with different surface properties

Zhou

Finch

et al. 1996

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Application of Enhanced Vacuum Filtration to Dewatering of Fine Coal Refuse

Cited by 3 publications

References 4 publications

Impact of mechanochemical treatment on surface chemistry and flocculation of kaolinite dispersion

Impact of mechanochemical treatment on surface chemistry and flocculation of kaolinite dispersion

Determination of Free and Bound Water in Fine Coal Filter Cake

Effect of gas nuclei on the filtration of fine particles with different surface properties

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