The performance and dispersing mechanism of anionic dispersants in slurries prepared by upgraded coal

Hu, Shunxuan; Chen, Yumeng; Wu, Changning; Li, Junguo; Liu, Ke

doi:10.1016/j.colsurfa.2020.125450

Cited by 33 publications

(16 citation statements)

References 48 publications

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“…High‐ash content could decrease calorific value, 43 and increase specific coal consumption and specific oxygen consumption, 44 implying a new perspective on the understanding of the effect of acid leaching on the slurryability of DCLR. The effective maximum solid loadings (ash‐free basis) of the slurries prepared with DEM‐1 and DEM‐2 are 65.8% and 64.8%, respectively, which are higher than that of the DCLRWS (64.4%).…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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 relationship between apparent viscosity and solid content of CWS at a shear rate of 100 s –1 is depicted in Figure . Meanwhile, the solid loading of CWS with an apparent viscosity of (1000 ± 100) mPa s was regarded as the maximum slurry concentration. , As illustrated in Figure , the apparent viscosity increased significantly as coal was added for all slurries. It could be attributed to increased frequency for particle collisions.…”

Section: Resultsmentioning

confidence: 99%

The Enhancement on Rheology, Flowability, and Stability of Coal Water Slurry Prepared by Multipeak Gradation Technology

Jiang

Zhao

et al. 2021

Energy Fuels

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Multipeaking gradation technology is an essential method for improving the slurry ability of coal particles. In this study, the coarse (150–300 μm), fine (54–74 μm), and micro (1–10 μm) coal particles with different ratios were applied to prepare coal water slurry (CWS). The ratio of coarse, fine, and micro particles in bimodal CWS, interval bimodal CWS, and triple-peak CWS was 60:40:0, 60:0:40, and 60:24:16, respectively. The effects of multipeaking technology on stability, flowability, and rheological behaviors of CWS were investigated systematically. The results indicated that the interval bimodal CWS had the best stability and flowability followed by the triple-peak CWS, and the bimodal CWS was the worst. It was demonstrated that the stability and flowability of CWS were enhanced with the increment of microparticles in slurry. Nevertheless, each slurry’s maximum solid content was 68% for bimodal CWS, 65% for interval bimodal CWS, and 70% for triple-peak CWS. It could be attributed to two effects of microparticles on the apparent viscosity of CWS, i.e., filling particle clearance and binding water. If the effect of filling particle clearance was dominant, then apparent viscosity was decreased, and it was beneficial to prepare CWS with high solid content like triple-peak CWS. However, when the effect of binding water was dominant, apparent viscosity was increased, and it was unfavorable for CWS preparation corresponding to interval bimodal CWS. It was worth noting that microparticles play a double side role in preparing highly concentrated CWS.

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“…In view of the poor slurryability of low-rank coal, significant effort has been made to improve the adsorption performance of PC, which has provided many valuable results for other researchers. 11,[14][15][16][17] The common method is to speculate the adsorption behavior of dispersant by measuring its adsorption capacity, adsorption thickness, contact angle, and zeta potential. 11,15 The combination of the water wettability on the coal surface and the zeta potential of coal particles was employed by Kakui et al to study the adsorption behavior of the functional groups in polymer dispersants as well as the aromatic groups and sodium sulfonate group in the sodium aromatic sulfonate structure on the coal surface.…”

Section: Introductionmentioning

confidence: 99%

“…11,[14][15][16][17] The common method is to speculate the adsorption behavior of dispersant by measuring its adsorption capacity, adsorption thickness, contact angle, and zeta potential. 11,15 The combination of the water wettability on the coal surface and the zeta potential of coal particles was employed by Kakui et al to study the adsorption behavior of the functional groups in polymer dispersants as well as the aromatic groups and sodium sulfonate group in the sodium aromatic sulfonate structure on the coal surface. They provided a schematic illustration to describe the hydrophobic interaction between the aromatic groups in the sodium aromatic sulfonate structure and the multi-ring portion of the carbonaceous particles on the coal surface as well as the ion bonding force between the sodium sulfonate group in the sodium aromatic sulfonate structure and the positively charged position on the coal surface in a CWS with pH 7-8.…”

Section: Introductionmentioning

confidence: 99%

“…In view of the poor slurryability of low‐rank coal, significant effort has been made to improve the adsorption performance of PC, which has provided many valuable results for other researchers 11,14–17 . The common method is to speculate the adsorption behavior of dispersant by measuring its adsorption capacity, adsorption thickness, contact angle, and zeta potential 11,15 .…”

Section: Introductionmentioning

confidence: 99%

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Experimental and computational studies of polycarboxylate dispersant effect on the properties of low‐rank coal water slurries

Nie

et al. 2022

Asia-Pacific J Chem Eng

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The performance and dispersing mechanism of anionic dispersants in slurries prepared by upgraded coal

Cited by 33 publications

References 48 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

The Enhancement on Rheology, Flowability, and Stability of Coal Water Slurry Prepared by Multipeak Gradation Technology

Experimental and computational studies of polycarboxylate dispersant effect on the properties of low‐rank coal water slurries

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