Prediction Method on the Static Stability of a Coal Water Mixture

Chai, Zhenhua; Zeng, Ming; Ren, Yangguang; Zhang, Ruijie; Feng, Laihong; Zhao, Zongci

doi:10.1021/acs.energyfuels.9b00082

Cited by 13 publications

(5 citation statements)

References 37 publications

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“…It can effectively reflect the change of suspension stability over time, and help analyze the mechanism of suspension stability. This technology has been applied to characterize the dispersion stability of dispersion systems such as concentrated emulsion and suspension 33–37 . But in the research of preparing composites by powder slurry method, multiple light scattering technologies has not yet been used to analyze the stability of suspension quantitatively.…”

Section: Resultsmentioning

confidence: 99%

“…When the particle volume fraction or diameter changed, there will have a variation in the BS and T signals 33–36 . Turbiscan stability index (TSI) is a relative value obtained according to the light variation of scan height to the total height 36,37 . It can be obtained using Equation ().

TSI goodbreak= \sum_{i = 1}^{n} \frac{\sum_{h = 1}^{n} (||, {scan}_{i} ((), h) goodbreak- {scan}_{i - 1} ((), h))}{H},

where h is the scan height and H is the total height of the measured sample.…”

Section: Methodsmentioning

confidence: 99%

“…At different concentrations, the surface tension of the surfactant solution is basically unchanged, indicating that the surfactant has formed micelles in water at these concentrations. 38,39 In order to select suitable surfactants for the powder impregnation method, the surfactant is required to have good wettability to the PEEK powder. It can be seen that the contact angle of deionized water to PEEK is 93.7 , indicating that it has poor wettability and PEEK is not hydrophilic.…”

Section: The Performance Of Surfactantsmentioning

confidence: 99%

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The synergistic steric hindrance effect in the preparation of polyether ether ketone composites by powder slurry method

et al. 2022

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The preparation of continuous carbon fiber reinforced polyether ether ketone (PEEK) composites by the powder slurry method has many advantages, but the stability of PEEK suspension is required to be high. So far, there is a lack of in‐depth studies on the aqueous suspension of PEEK. In this study, two non‐ionic surfactants were selected for compounding. Then PEEK aqueous suspension and continuous carbon fiber reinforced PEEK composites were prepared. The stability mechanism of PEEK aqueous suspension with different surfactants was analyzed. Studies have shown that in the PEEK aqueous suspension, Triton X‐100 can help to infiltrate the PEEK powder. The steric hindrance of polyethylene glycol contributes to the stability of the suspension. The synergistic steric hindrance effect of the two surfactants can increase the stability time of PEEK suspension from 5 min to more than 50 min. The PEEK composites prepared by the powder slurry method has good quality stability, the fiber volume fraction is about 60%, the flexural strength of the composites can reach 1336 MPa, and the interlayer shear strength can reach 106 MPa. This study provides useful insights for the stability mechanism of PEEK aqueous suspension, and can guide the preparation process of thermoplastic composites by powder slurry method.

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Section: Resultsmentioning

confidence: 99%

TSI goodbreak= \sum_{i = 1}^{n} \frac{\sum_{h = 1}^{n} (||, {scan}_{i} ((), h) goodbreak- {scan}_{i - 1} ((), h))}{H},

where h is the scan height and H is the total height of the measured sample.…”

Section: Methodsmentioning

confidence: 99%

Section: The Performance Of Surfactantsmentioning

confidence: 99%

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The synergistic steric hindrance effect in the preparation of polyether ether ketone composites by powder slurry method

et al. 2022

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“…Although the common commercial dispersants are used for the stabilization of CWS, the natural additives could be a viable option in consideration of both the environment and economy. 5,193 Viscosity is a crucial rheological property of CWS. The viscosity and shear stress of CWS can be reduced by adding an appropriate amount of dispersant.…”

Section: Rheological Behaviormentioning

confidence: 99%

“…The properties of dispersant have a noticeably crucial effect on the flow behavior of CWS, and thus, the selection of dispersant is of vital importance. Although the common commercial dispersants are used for the stabilization of CWS, the natural additives could be a viable option in consideration of both the environment and economy. , …”

Section: Rheological Behaviormentioning

confidence: 99%

Review and Perspectives of Anionic Dispersants for Coal–Water Slurry

Feng

et al. 2023

Energy Fuels

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Dispersants are chemical moieties that modify interfacial characteristics by adsorption at the solid–liquid interface, and they have been widely used in modern industrial production. This review focuses on the research and perspectives of anionic dispersants for coal–water slurry (CWS). Various common anionic dispersants are briefly summarized, including natural and synthetic species. The interactions between coal particles in the CWS suspension, including van der Waals attraction and electrostatic repulsion, are described by the DLVO (Derjaguin–Landau–Verwey–Overbeek) theory. Due to the hydrophobic interaction and the steric effect resulting from the adsorption of polymer dispersants, the extended DLVO theory is introduced to elucidate the various interactions in the CWS system. Based on the interactions between the coal particles, the adsorption behaviors at the coal–water interface, and the interactions between coal and water, the dispersion and stabilization mechanisms are systematically and theoretically discussed. According to the variations of interaction energies between the coal particles, the use of anionic polymer dispersants can weaken the hydrophobic attraction and enhance the steric hindrance and electrostatic repulsion. Also, the rheological behaviors of CWSs are outlined, with emphasis on the pipeline transportation of CWS and the three-parameter Herschel–Bulkley model. Additionally, the properties of anionic dispersants for CWS can be improved by adjusting their chemical structures such as molecular weight, side chain length, rigidity and flexibility of the molecular chain, and variety, quantity, position, and proportion of hydrophobic and hydrophilic groups. In view of the relationships between the structure and property, a direction on the selection and preparation of dispersant for CWS is suggested. Finally, the current challenges and future perspectives of dispersants for CWS are put forward.

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Improved Sedimentation Performance of Low-Rank Coal by Coprocessing with Saline Wastewater

Huang

Guo

et al. 2021

Mining, Metallurgy & Exploration

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Prediction Method on the Static Stability of a Coal Water Mixture

Cited by 13 publications

References 37 publications

The synergistic steric hindrance effect in the preparation of polyether ether ketone composites by powder slurry method

The synergistic steric hindrance effect in the preparation of polyether ether ketone composites by powder slurry method

Review and Perspectives of Anionic Dispersants for Coal–Water Slurry

Improved Sedimentation Performance of Low-Rank Coal by Coprocessing with Saline Wastewater

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