Surface Coating Improves Coal–Water Slurry Formation of Shangwan Coal

Zhou, Zhijun; Li, Xiang; Liang, Jiaming; Liu, Jianzhong; Zhou, Junhu; Cen, Kefa

doi:10.1021/ef200529h

Cited by 34 publications

(15 citation statements)

References 34 publications

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“…Besides, the hydrophilic particle surface did not favor the adsorption of surfactants 31 . The steric and electrostatic repulsion between coal particles was weakened.…”

Section: Energy and Fuelsmentioning

confidence: 93%

Influence of Small Oxygen-Containing Organic Molecules on the Rheology of the Coal Water Slurry

Zhang¹,

Zhao²,

Wang³

et al. 2016

Energy Fuels

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In order to alleviate the increasingly serious water pollution, industrial wastewater is expected to be treated by coal gasification. In this paper, the usability of wastewater in coal water slurry (CWS) was evaluated. The influences of common components in industrial wastewater, small oxygen-containing organic molecules, on the rheology of CWS were researched. The viscosity and yield stress of CWS were found to increase with the presence of small organic molecules. The microstructures and mechanisms of slurries were characterized using confocal laser scanning microscope (CLSM), FT-IR and contact angle measurement. In CWS, hydrophobic surface of coal particle was found to absorb small oxygen-containing organic molecules and turn hydrophilic. It resulted in thicker hydration layers and less amount of free water. In addition, dispersants were difficult to absorb at the hydrophilic surface, weakening the steric and electrostatic repulsion between particles. Thereby, industrial wastewater (containing small oxygen-containing organic molecules) has negative impacts on CWS preparation. Further steps are expected to be researched to weaken and eliminate these negative impacts, so as to improve the treatment technology of industrial wastewater.

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“…Besides, the hydrophilic particle surface did not favor the adsorption of surfactants 31 . The steric and electrostatic repulsion between coal particles was weakened.…”

Section: Energy and Fuelsmentioning

confidence: 93%

Influence of Small Oxygen-Containing Organic Molecules on the Rheology of the Coal Water Slurry

Zhang¹,

Zhao²,

Wang³

et al. 2016

Energy Fuels

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show abstract

“…In general, the adsorption of dispersant on coal particles is mainly driven by hydrophobic interaction between the dispersant and coal surface, such as the adsorption of NSF [12,13]. However, the composition of coal surface is complex: except for the hydrophobic area, a partial positively charged area is also present on the coal surface because of cations in ash [17], and a partial negatively charged area exists due to the ionization of oxygen functional groups [18][19][20]. In most cases, the coal surface is negatively charged as a whole because oxygen group content is much higher than ash content.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a novel amphoteric copolymer and its application as a dispersant for coal water slurry preparation

Zhang

Yang

et al. 2021

R. Soc. open sci.

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In this work, a novel amphoteric copolymer named Poly(sodium p-styrenesulfonate– co -acrylic acid- co -diallyldimethylammonium chloride) (P(SS- co -AA- co -DMDAAC)) was synthesized via free radical polymerization. Afterwards, P(SS- co -AA- co -DMDAAC) was explored for use as a dispersant in coal water slurry (CWS) preparation. The structure of P(SS- co -AA- co -DMDAAC) was verified by Fourier transform infrared spectroscopy and nuclear magnetic resonance. The synthetic conditions were optimized as the feed ratio of AA to SS was 1 : 1 (for Yulin coal) or 1.5 : 1 (for Yili coal), and DMDAAC dosage was 4.0 wt% (for Yulin coal) and 6.0 wt% (for Yili coal) toward total monomers. The performances of P(SS- co -AA- co -DMDAAC) as a dispersant for CWS were evaluated by various technologies, such as apparent viscosity, zeta potential, static stability and contact angle measurements. The results revealed that the optimized dosage of P(SS- co -AA- co -DMDAAC) in CWS preparation was 0.3 and 0.4 wt% for Yulin coal and Yili coal respectively. In this optimum condition, CWS prepared using P(SS- co -AA- co -DMDAAC) as dispersant showed a typical shear thinning behaviour and excellent stability, which are desired in industries. The rheological models also confirmed the pseudo-plastic characteristics of CWS. Finally, compared with the widely used anionic dispersant naphthalene sulphonate formaldehyde condensate (NSF) and poly(sodium p-styrenesulfonate) (PSS), P(SS- co -AA- co -DMDAAC) developed in this work exhibited better slurry making performance. The introduction of cationic functional groups promoted the adsorption of the dispersant, which further enhanced the electrostatic repulsion and steric hindrance among coal particles. Accordingly, the viscosity of CWS decreased and static stability enhanced.

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“…It was proved that the introduction of oxygen-containing functional groups into oily collectors could make the collectors stably adsorb on the surface of low-rank coal, thus, changing the surface hydrophobicity of low-rank coal [ 7 , 8 ]. Zhou et al [ 9 ] used Sorbitan Monolete (Span 80) series surfactants with hydroxyl and ester groups to explore the flotation effect of low-rank coal and found that it can significantly improve the hydrophobicity of low-rank coal. Jena et al [ 10 ] found that alcohol collectors can effectively improve the hydrophobicity of low-rank coal.…”

Section: Introductionmentioning

confidence: 99%

Construction of Molecular Model and Adsorption of Collectors on Bulianta Coal

et al. 2020

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To study the effects of different oxygen functional groups on the quality of flotation clean low-rank coal, two kinds of collectors with different oxygen-containing functional groups, methyl laurate, and dodecanol, were selected and their flotation behaviors were investigated. The Bulianta coal was the typical sub-bituminous coal in China, and the coal molecular model of which was constructed based on proximate analysis, ultimate analysis, 13C-NMR, and XPS. The chemical structure model of the coal molecule was optimized, and the periodic boundary condition was added via the method of molecular dynamics methods. The different combined systems formed by collectors, water, and a model surface of Bulianta coal have been studied using molecular dynamics simulation. The simulation results of dodecanol and methyl laurate on the surface of Bulianta coal show that dodecanol molecules are not evenly adsorbed on the surface of coal, and have higher adsorption capacity near carboxyl and hydroxyl groups, but less adsorption capacity near carbonyl and ether bonds. Methyl laurate can completely cover the oxygen-containing functional groups on the coal surface. Compared with dodecanol, methyl laurate can effectively improve the hydrophobicity of the Bulianta coal surface, which is consistent with the results of the XPS test and the flotation test.

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Surface Coating Improves Coal–Water Slurry Formation of Shangwan Coal

Cited by 34 publications

References 34 publications

Influence of Small Oxygen-Containing Organic Molecules on the Rheology of the Coal Water Slurry

Influence of Small Oxygen-Containing Organic Molecules on the Rheology of the Coal Water Slurry

Synthesis of a novel amphoteric copolymer and its application as a dispersant for coal water slurry preparation

Construction of Molecular Model and Adsorption of Collectors on Bulianta Coal

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