Interaction mechanism of flocculants with coal waste slurry

Sabah, Eyüp; Erkan, Z.E.

doi:10.1016/j.fuel.2005.06.005

Cited by 124 publications

(51 citation statements)

References 13 publications

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“…Hydrogen bonding is the main driving force for PAM polymers to adsorb on clay surface (Sabah and Erkan, 2006). For HPAM, it is therefore not sufficient to enhance their affinity on clay surface by adjusting such molecular properties as charge density and molecular weight (Michaels, 1954;Gu and Doner, 1993).…”

Section: Al-pam Synthesis and Characterizationmentioning

confidence: 99%

Novel polymer aids for low‐grade oil sand ore processing

Long

et al. 2008

Can J Chem Eng

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In the present study, a hybrid Al(OH) 3 -polyacrylamide (Al-PAM) was synthesized and used in combination with a partially hydrolyzed polyacrylamide (HPAM) to process a low-grade oil sand ore. It was found that Al-PAM was capable to improve bitumen froth quality and tailings settling. But it led to deterioration in bitumen recovery due to the formation of large bitumen lumps during the bitumen extraction process. To resolve this problem, HPAM was added in combination with Al-PAM as a dual system. The use of the dual system at a low dosage achieved a holistic improvement in bitumen recovery, froth quality, and tailings settling. To understand the role of Al-PAM and the dual system in the bitumen extraction process, bitumen-clay, bitumen-bitumen, and clay-sand interaction and adhesion forces were directly measured using an atomic force microscope (AFM). The measured forces indicate that bitumen recovery and tailings settling are controlled by the colloidal interaction and adhesion forces between the oil sand components.Dans la présenteétude, un polyacrylamide-Al(OH) 3 hybride (Al-PAM) aété synthétisé et utilisé conjointementà un polyacrylamide partiellement hydrolysé (HPAM) afin de traiter un minerai de sables bitumineux de faible teneur. On a trouvé que l'Al-PAMétait capable d'améliorer la qualité de l'écume de bitume et la sédimentation des résidus. Mais celui-ci donne une moins bonne récupération du bitume en raison de la formation de larges agrégats de bitume lors du procédé d'extraction. Afin de résoudre ce problème, du HPAM aété ajoutéà de l'Al-PAM comme système dual. L'utilisation de ce systèmeà faible dose a permis l'amélioration générale de la récupération de bitume, de la qualité de l'écume et de la sédimentation des résidus. Pour comprendre le rôle de l'Al-PAM et du système dual dans le procédé d'extraction de bitume, l'interaction bitumeargile, bitume-bitume et argile-sable ainsi que les forces d'adhésion ontété mesurées directementà l'aide d'un microscope de force atomique (AFM). Les forces mesurées indiquent que la récupération de bitume et la sédimentation des résidus sont contrôlées par les forces d'interaction et d'adhésion colloidales entre les composantes des sables bitumineux.

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Section: Al-pam Synthesis and Characterizationmentioning

confidence: 99%

Novel polymer aids for low‐grade oil sand ore processing

Long

et al. 2008

Can J Chem Eng

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“…To clean coal slime containing fine mineral impurities of clay particles nonionogenic [4], ionigenic (cationogenic and anionogenic) flocculants [5], their combination with each other [6] with coagulants [3] or mineral salts [7] are used. General recommendations for the use of flocculants are reduced to the selection of the type and concentration of flocculant for purification of a particular type of slime with a certain concentration and disperse composition.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Flocculs Strength of Polydisperse Coal Suspensions to Mechanical Influences

Shkop

Tseitlin

Shestopalov

et al. 2017

EUREKA: Physics and Engineering

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The effect of the concentration and disperse composition on the flocculation strength to mechanical influence is investigated. It is found that the residual rate of floccules sedimentation after the mechanical influence at a constant rate of flocculant has a maximum value at a concentration of solids in the slime in the range of 7-30 g/dm3. The best results are obtained in all the experiments at a solids concentration of 10 g/l. It is found that at a concentration up to 7 g/l and more than 30 g/l, the floccules is formed. They have the lowest residual rate after mechanical influences. With increasing content of the solid fraction of 40-100 microns over 15%, the strength of floccules increases. They retain their shape and relatively high sedimentation rate even after mechanical influence. The obtained data allow to recommend correction of the slime composition before flocculant injection both the concentration close to the optimum, and the content of size fraction of 40-100 mm more than 15 %.

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“…In the slurry, particles of rock, clay and coal are too small to float or sink [1][2][3]. It was reported that clay minerals [4], such as montmorillonite, kaolinite and illite [5][6][7][8], have a detrimental effect on coal slime dewatering and cleaning [9][10][11]. However, the coal slime water must be clarified and recycled in order to save water resources and reduce environmental pollution [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Aggregation Mechanism of Particles: Effect of Ca2+ and Polyacrylamide on Coagulation and Flocculation of Coal Slime Water Containing Illite

Lin

Hou

et al. 2017

Minerals

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Abstract:Illite is one of the main components in coal slime water and it sometimes makes the water extremely difficult to clarify. In this study, the aggregation mechanism of coal and illite particles was investigated using the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory and settling experiments of slime water containing coal and illite. The results show that electrostatic energy plays a dominant role and manifests repulsive force in the long-range (>4 nm). However, the leading role becomes a hydrophobic force determined by the polar surface interaction energy in the short-range (<4 nm). A coagulant (Ca 2+ ) can lower the surface electric potential to make all particles easier to coagulate, while the surface hydrophobicity of coal and illite determines whether the particles aggregate. Cationic polyacrylamide (CPAM) can promote the sedimentation of particles flocs effectively and makes the supernatant clearer due to attractive electrostatic forces while anionic polyacrylamide (APAM) flocculates particles through the bridge mechanism. Although the hydration shell on the hydrophilic surface of illite appears to be harmful for either coagulation or flocculation, illite can accelerate sedimentation when it is attached to the coal due to its higher density.

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Interaction mechanism of flocculants with coal waste slurry

Cited by 124 publications

References 13 publications

Novel polymer aids for low‐grade oil sand ore processing

Novel polymer aids for low‐grade oil sand ore processing

A Study of the Flocculs Strength of Polydisperse Coal Suspensions to Mechanical Influences

Aggregation Mechanism of Particles: Effect of Ca2+ and Polyacrylamide on Coagulation and Flocculation of Coal Slime Water Containing Illite

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