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Minerals 2017, 7(2), 30; https://doi.org/10.3390/min7020030

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

1
Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, China University of Mining and Technology, 221116 Xuzhou, China
2
School of Chemical Engineering and Technology, China University of Mining and Technology, 221116 Xuzhou, China
*
Author to whom correspondence should be addressed.
Academic Editor: Massimiliano Zanin
Received: 15 December 2016 / Revised: 14 February 2017 / Accepted: 15 February 2017 / Published: 21 February 2017
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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 (Ca2+) 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. View Full-Text
Keywords: illite; coal slime water; coagulation; extended DLVO theory illite; coal slime water; coagulation; extended DLVO theory
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Lin, Z.; Li, P.; Hou, D.; Kuang, Y.; Wang, G. Aggregation Mechanism of Particles: Effect of Ca2+ and Polyacrylamide on Coagulation and Flocculation of Coal Slime Water Containing Illite. Minerals 2017, 7, 30.

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