Stability and settling performance of coal water slurries under vibration conditions

Chai, Zhenhua; Ren, Yangguang; Zhang, Ruijie; Feng, Laihong; Liu, Shucheng; Wang, Zhichao; Zeng, Ming

doi:10.1016/j.powtec.2020.07.047

Cited by 28 publications

(5 citation statements)

References 45 publications

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“…Turbiscan is a potentially promising method for studying stability over a short period while simultaneously providing information on destabilization kinetics, including purification, coalescence, agglomeration, and sedimentation. 33,37 Based on the variation in the droplet volume fraction (migration) or average size (coalescence), variation of the BS signals measured as a function of time was performed along the cylindrical cell every 10 min for 12 h. At pH 6.5, there is a significant change in delta BS, which forms at a height slightly above the floor due to rapid sedimentation and flocculation. However, only slight sedimentation occurred at pH 8.5.…”

Section: Influence Of Dispersant Amount and Ph On The Stability Of Sl...mentioning

confidence: 99%

Designing slurry conditions to control size distribution of spray‐dried dense YSZ granules

Cha

Shin

Son

et al. 2023

Int J Applied Ceramic Tech

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This study suggests approaches to achieve the desired size and size distribution of highly dense spherical granules by investigating the effect of slurry conditions on size distribution. Highly dense spherical granules were prepared with a solid content of over 77 wt% by spray-drying the slurry. A prolonged deagglomeration time of 64 h provided adequate flowing ability by breaking up almost all aggregates and improved dispersibility, resulting in reduced granule sizes and narrow size distributions. The optimum slurry conditions for maintaining dispersibility were 1 wt% of the dispersant and a strong basic pH, which had the greatest effect on size distribution. Based on these considerations, the 10.6 µm sized 3 mol% yttria-stabilized zirconia granules were synthesized with 99.83% density, 97.17% sphericity, and uniform size with fraction yield of 80.01% at 10-20 µm. These dense granules have significantly higher hardness and modulus values of 19.19 and 206.68 GPa, respectively, than that of pellet and film types. To the best of our knowledge, the relationship between the slurries and the span of the size distribution of ceramic granules during spray-drying has been demonstrated for the first time.

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Section: Influence Of Dispersant Amount and Ph On The Stability Of Sl...mentioning

confidence: 99%

Designing slurry conditions to control size distribution of spray‐dried dense YSZ granules

Cha

Shin

Son

et al. 2023

Int J Applied Ceramic Tech

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“…The pulverized coal was then heated to 500-600°C to completely carbonize and maintain a constant weight, for which the ash values for each particle size were obtained. From the ash test results, it can be deduced that the coal slurry sample is low ash pulverized coal, and the recovered coal slurry can be directly blended into the large coal for electric coal use [24]. According to the sinking speed test, when the sinking time is within 10~30min, the coal slurry is slightly turbid above the stratification area and gradually clears later, but the coal slurry is divided into the upper suspension and the lower precipitation regardless of the time period.…”

Section: Experimental Analysis Of Coal Mine Water Sinkingmentioning

confidence: 99%

Research Review of Coal Mine Water Treatment Technology

Wang²

2022

AJARR

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A large amount of mine water is produced during coal mining. The treatment and reuse of mine water is a significant research topic in the environment with shortages of water resources. In this paper, the characteristics of coal mine water are systematically reviewed based on previous studies. The water quality conditions of coal mine water, the particle size of suspended particles, and the aggregation stability of particles in coal mine water were reviewed in summary. The application of Stokes law and EDLVO theory in the field of water sedimentation in coal mines is illustrated. The types of sedimentation tanks used in the settlement of coal mine water and their characteristics are also reviewed according to the treatment technology. It provides significant assistance in the selection of sedimentation tanks. And a brief analysis of the future development trend and research focus of coal mine water treatment technology was made in the end.

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“…It was found that the classical DLVO theory cannot reasonably explain the coalescence of coal slime water. Recent studies [19] have shown that there is a special interaction energy between hydrophilic or hydrophobic colloidal particles, in addition to Van der Waals energy and electrostatic interaction energy, that plays a decisive role in the stability of colloidal dispersion system. This energy is called interfacial polar interaction energy (A-B interaction energy for short).…”

Section: Xdlvo Theorymentioning

confidence: 99%

Effect of the Polymerized Titanium Ferric Sulfate (PTFS) Coagulant on Sedimentation of Coal Slime Water

Shi

Guo

et al. 2021

Minerals

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High efficiency slime water settlement is very important for ensuring washing water recycling in coal preparation plants. In order to improve the sedimentation of coal slime water, an iron ion-based coagulant was prepared by titanium ion complexation action using titanium sulfate as a main raw material, Fe3+ and NaH2PO3 as a stabilizer and NaHCO3 as an alkalizing agent. The particle size distribution of coal slime was measured, and the sedimentation test for coal slime water was carried out with PAM, polyaluminum chloride and polymerized titanium ferric sulfate (PTFS), respectively. Then, coal slime water sedimentation was investigated at different PAM dosages and polyaluminum chloride or coal slime water of PTFS with various molar ratios of PAM and ferrotitanium. The results showed that PAM and polyaluminum chloride could not make coal slime settle down, and PTFS showed a poor settlement effect. When polyaluminum chloride and PTFS were used together with PAM, it produced a molecular weight of 3 million respectively. Polyaluminum chloride needs 6.66 × 10−10 mol of PAM, PTFS needs 0.66 × 10−10 mol of PAM and the effect of sedimentation is improved. When the molar ratio of PTFS was 1:7, polymerization performance was effective. The sedimentation effect of PTFS was better than that of polymeric aluminum chloride coagulant usually used in coal preparation plants, especially when combined with flocculant, and high efficiency was reached. The surface potential and surface free energy of coal slime particles before and after adding coagulant were measured and analyzed by XDLVO theory to explain the action mechanism of PTFS coagulant. Experimental results demonstrated that PTFS can significantly improve the sedimentation of coal slime water, save the dosage of PAM and increase economic benefit.

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Stability and settling performance of coal water slurries under vibration conditions

Cited by 28 publications

References 45 publications

Designing slurry conditions to control size distribution of spray‐dried dense YSZ granules

Designing slurry conditions to control size distribution of spray‐dried dense YSZ granules

Research Review of Coal Mine Water Treatment Technology

Effect of the Polymerized Titanium Ferric Sulfate (PTFS) Coagulant on Sedimentation of Coal Slime Water

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