Improvement on slurry ability of lignite under microwave irradiation

Ren, Yangguang; Zheng, J. P.; Yang, Xiao Ping; Xu, Zhiqiang; Cao, Zhihua

doi:10.1016/j.fuel.2016.11.047

Cited by 35 publications

(13 citation statements)

References 25 publications

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“…This was likely caused by the loss of moisture making the surface of the iron ore more hydrophobic, which is desired for better slurry behaviour. All suspensions were found to adhere to pseudo‐plastic behaviour as reported in the works by Meikap et al and Sahoo et al In a more recent work, Ren et al studied the rheology of a microwaved lignite water slurry (LWS). The authors concluded that an increase in the irradiation time was found to improve the pseudo‐plasticity while also decreasing the yield stress of the LWS.…”

Section: Future Developmentsmentioning

confidence: 59%

“…Some researchers have reported that the microwave treatment can be effective to decrease the viscosity of mineral slurries by modifying or smoothing the surfaces of specific particles in the slurries . Meikap et al used microwave pre‐treatment to investigate the rheology of coal slurries, and they reported that all of the slurries exhibited pseudo‐plastic behaviour, regardless of the mixture, and the microwave treated samples experienced lower shear stresses.…”

Section: Future Developmentsmentioning

confidence: 99%

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Slurry rheology in mineral processing unit operations: A critical review

2019

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Knowledge of slurry rheology in mineral processing is essential for the optimization of wet-grinding, dewatering, transport, and tailings management and it is becoming important in flotation due to the increasing need to process complex ores with a high clay mineral content. Slurries of these ores often display complex rheological behaviour even at low solids concentration, and traditional rheology measurements in mineral processing, such as yield stress and apparent viscosities, may not provide the critical information needed for process optimization. The objective of this paper is to provide a comprehensive review of some of the previous rheology studies performed at the bench, pilot plant, and industrial scale for different unit operations and to discuss the potential for alternative rheology measurements to provide a better insight into colloidal particle interactions in slurries with clay minerals. Firstly, the fundamentals of slurry rheology and the influence of colloidal particles are presented. Secondly, rheology measurements for suspensions are described briefly. Thirdly, a review of rheology studies in grinding, classification, flotation, dewatering, and tailings management is done, outlining possible ways of determining types of particle associations in slurries. Finally, recommendations for future research directions are provided.

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Section: Future Developmentsmentioning

confidence: 59%

Section: Future Developmentsmentioning

confidence: 99%

Slurry rheology in mineral processing unit operations: A critical review

2019

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“…The static stability of CWS prepared in the presence and absence of dispersant were compared by a stability analyser. The coefficient TSI as a quantitative parameter was used to estimate the stability of CWS [ 26 , 28 ]. As can be seen from figure 10 , the TSI of CWS prepared without dispersant is 0.66 and 0.61 for Yili coal and Yulin coal, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Before measurements, CWS samples were stirred for 10 min and then filled into the sample bottle to a certain height. Afterwards, the bottle was transferred to the analyser and scanned every 10 min over a period of 5 h. The coefficient Turbiscan stability index (TSI) was used to evaluate the stability of CWS [ 25 , 26 ]. A higher TSI value means poorer static stability.…”

Section: Methodsmentioning

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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“…Among mineral resources, the study of coal in suspension is complicated by factors including its composition, structure, and degree of carbonization, coupled with the mudification, weathering, and oxidation that occur during its storage, transportation, and preparation. Many studies have focused on the adjustment of the viscosity of the coal water slurry by adding additives (Wang et al, 2019;Zhu et al, 2017;Chen et al, 2019;Konduri and Fatehi, 2018), by changing the surface properties of the coal using microwave pre-treatment (Sahoo et al, 2017;Ren et al, 2017;Meikap et al, 2005), by using secondary fluids and additional particles (Chen et al, 2019), or by pre-absorbing water into the coal (Zhang et al, 2016). However, in wet coal preparation, the products of some processes are transported as low-concentration suspensions.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle properties on rheology of low-concentration coal suspensions

Hou¹,

Ma²,

Fan³

et al. 2020

Physicochem. Probl. Miner. Process.

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In wet coal preparation, the products of some processes are transported as low-concentration suspensions. Their rheology is greatly affected by the properties of the coal particles that result from the formation and weathering during preparation. In this study, the properties of coal particles, including volumetric properties (i.e., solids content, granularity, and clay mineral fraction) and surface characteristics (i.e., dynamic potential, degree of coalification, and degree of surface oxidization), were studied to determine their effects on the apparent viscosity of low-concentration coal suspensions. With increasing solids content and smaller particle size in the suspension, the interactions between the coal particles became stronger due to the increased particle content, thus increasing the coal suspension's apparent viscosity. Adding clay minerals to the suspension gradually changed its composition and structure and increased its viscosity. The dynamic potential of the coal particles and inter-particle electrostatic repulsive forces were reduced with the addition of Ca 2+ ions, and the coal particles collided and aggregated, which increased the apparent viscosity of the suspension. For coal with a low degree of coalification or coal had been oxidized by a hydrogen peroxide solution, the suspension of the hydrophilic coal particles was associated with a lower apparent viscosity than that of highly hydrophobic solids, which tended to aggregate and form flocculent masses.

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Improvement on slurry ability of lignite under microwave irradiation

Cited by 35 publications

References 25 publications

Slurry rheology in mineral processing unit operations: A critical review

Slurry rheology in mineral processing unit operations: A critical review

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

Effect of particle properties on rheology of low-concentration coal suspensions

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