Influence of different dispersants on rheological behaviors of coal water slurry prepared from a low quality coal

Hu, Shunxuan; Liu, Liming; Yang, Xin; Li, Junguo; Zhou, Baonan; Wu, Changning; Weng, Li; Liu, Ke

doi:10.1039/c9ra04391h

Cited by 28 publications

(21 citation statements)

References 39 publications

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“…Hu et al reported that the maximum solid loading of CWS prepared from two upgraded coals based on flotation method was about 6% higher than that prepared from the raw low‐quality coals, which could be attributed to the apparent decrement of specific surface area and porosity after flotation 17 . Identical results were obtained by Hu et al, and the improvement of slurryability of the refined coal was found to be related to the decrease in both the porosity and hydrophilicity of coal particles 18 . Zou et al observed the maximum solid loadings to decrease by 4.6%, 6.6%, and 4.4%, respectively, for acid–alkali leaching of Hebi coal, Huainan coal, and Jingyuan coal at 170°C to 180°C, which was due to the changes of organic matrix and surface properties 19 .…”

Section: Introductionmentioning

confidence: 82%

“…The relationship between the properties of CWS and mineral matters was accidentally mentioned by some researchers, [13][14][15][16][17][18][19][20] but the underlying mechanism was not studied in depth. Pittsburgh No.…”

Section: Introductionmentioning

confidence: 99%

“…17 Identical results were obtained by Hu et al, and the improvement of slurryability of the refined coal was found to be related to the decrease in both the porosity and hydrophilicity of coal particles. 18 Zou et al observed the maximum solid loadings to decrease by 4.6%, 6.6%, and 4.4%, respectively, for acid-alkali leaching of Hebi coal, Huainan coal, and Jingyuan coal at 170 C to 180 C, which was due to the changes of organic matrix and surface properties. 19 Xie et al studied the effects of several processing methods, including water washing, acid washing, and deashing at 60 C, on the properties of coal water slurries.…”

Section: Introductionmentioning

confidence: 99%

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Properties of direct coal liquefaction residue water slurry: Effect of mineral matters by acid‐leaching demineralization

Wang

et al. 2022

Asia-Pacific J Chem Eng

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The effects of demineralization treatment by acid leaching on the properties of direct coal liquefaction residue water slurry (DCLRWS) were investigated. The demineralized direct coal liquefaction residue (DCLR) with different mineral matter content and composition was prepared by leaching with the solution of HCl/HF, HCl, and HF, designated as DEM-1, DEM-2, and DEM-3, respectively. After demineralization, the slurryability of DCLR decreases but their effective solid loading (ash-free basis) increases. The results indicate that metallic minerals are the principal factor improving the slurryability of DCLRWS, mainly by increasing the dispersant adsorption capacity of DCLR. In addition, the decreasing density of DCLR after demineralization is not advantageous to its slurryability. DCLRWSs prepared by DCLR, DEM-1, and DEM-2 all have the same stabilization time (2 days), indicating that removal of metallic minerals could not deteriorate the stability. However, after removal of clay minerals, the slurries prepared by DEM-3 tend to form sediment after stopping high-speed stirring, attributed to its lowest zeta potential and loss of stability due to clay minerals. Except for DEM-3, the slurries prepared by other three samples all have a shear-thinning behavior, with the strongest behavior observed for DEM-1 slurry.

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Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Properties of direct coal liquefaction residue water slurry: Effect of mineral matters by acid‐leaching demineralization

Wang

et al. 2022

Asia-Pacific J Chem Eng

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“… 2 A high-quality CWS should exhibit a high solid content and low viscosity; the additives used are vitally important in this regard. 3 At present, the anionic additives used in industrial applications include naphthalenesulfonates, aliphatic sulfonates, lignin sulfonates, humate sulfonates, and carboxylate. 4 − 7 …”

Section: Introductionmentioning

confidence: 99%

Slurryability and Influencing Mechanism of Hydrophobic Structures in Additive–Coal–Water Ternary System

Zhang

Chu

et al. 2022

ACS Omega

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This study investigates the effects of additive adsorption onto coal particles on surface properties, hydrophobic groups on the slurryability, and the moisture occurrence form on the performance of coal water slurry (CWS). Mechanisms related to the different hydrophobic structures of the additives are proposed. The adsorption method of sulfonated acetone formaldehyde enhances the adsorption capacity of coal surfaces but is not conducive to slurrying. Sodium lignin sulfonate has hydrophobic ends with nonpolar aromatic groups, three-dimensional macromolecular structures, and complex branched chains, which provide CWS with good stability and slurryability. Naphthalenesulfonate formaldehyde has a double benzene ring structure and provides the thick but nonuniform adsorption layers on coal surfaces. The many amorphous structures and low molecular weights of sodium humic sulfonate lead to nonuniform hydration films and poor slurryability. The results of this paper provide guidance for improving synergism in coal–water–additive systems and enhancing slurry performance.

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“…Eight projects at various stages of implementation are underway in China, all of which are intended to replace traditional fuels completely. In general, in Nigeria, Qatar, Malaysia, and the United States, about 50 facilities with a total capacity of more than 300 million tons of fuel per year are at the design and construction stage [4]. Japan, India [5], Poland, Indonesia, Pakistan joined the problem.…”

Section: Introductionmentioning

confidence: 99%

Synthetic and coal-water fuels improving is the instrument of industrial region sustainability increasing

Dobrovolsky

Sorokin

2021

E3S Web Conf.

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New methods of processing bituminous and brown coal in synthetic and coal-water fuel production are now gaining relevance. On the one hand, this is dictated by the pragmatic need to reduce the dependence of industrial energy consumers on the prices and quality of hydrocarbon raw materials, especially in the context of the constant exacerbation of market restrictions associated with the pandemic and sanctions, on the other hand, there is an urgent need for environmentally friendly methods of using synthetic and coal-water fuels. The article discusses the currently used technologies for the production of synthetic and coal-water fuels. The authors identify its main disadvantages and limitations and propose a schematic diagram of a technological line for coal-water fuel production with a linear layout. It allows obtaining fuel with good fluidity and higher stability, high-calorie content, and low ash content with less energy consumption.

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Influence of different dispersants on rheological behaviors of coal water slurry prepared from a low quality coal

Abstract: To improve the efficiency of the gasification or combustion process of coal water slurry (CWS), it is significant to optimize the rheological properties and increase the solid concentration of CWS.

Cited by 28 publications

References 39 publications

Properties of direct coal liquefaction residue water slurry: Effect of mineral matters by acid‐leaching demineralization

Properties of direct coal liquefaction residue water slurry: Effect of mineral matters by acid‐leaching demineralization

Slurryability and Influencing Mechanism of Hydrophobic Structures in Additive–Coal–Water Ternary System

Synthetic and coal-water fuels improving is the instrument of industrial region sustainability increasing

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