Natural hydrophobic flocculation of fine coal particles in aqueous solution

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:51907

Song, S; Lu, S ^[1]; Trass, O; Wang, G ^[2]; Wang, Z ^[3]

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1. Univ. of Science and Technology, Beijing (China)
2. Univ. of Toronto, Ontario (Canada). Dept. of Chemical Engineering and Applied Chemistry
3. China Univ. of Mining and Technology, Beijing (China)

The hydrophobic flocculation of fine coal particles with natural hydrophobicity in aqueous solution, which is called natural hydrophobic flocculation, has been studied in this paper. It features no surfactant addition but only high intensity mechanical agitation. The experimental results showed that this flocculation occurred even in the case of {minus}58 mV jet potential of coal particles, that is contrary to the classical DLVO (Derjaguin-LandauVerwey-Overbeek) theory. Wettability of coal particle surface dominates the stability o fine coal particles in aqueous solution. The bigger the contact angle, the more intensive the flocculation of the coal particle suspension. The quantitative theory of natural hydrophobic flocculation is presented in this paper. Using this theory, the authors have calculated the total potential energy of interaction between coal particles in aqueous solution. The results demonstrate that the hydrophobic interaction plays a dominant role in the interaction between coal particles in aqueous solution.

• OSTI ID: 51907
• Report Number(s): CONF-940930--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ASH CONTENT
CHINA
COAL
COAL FINES
COAL PREPARATION
EXPERIMENTAL DATA
FLOCCULATION
OXIDATION
PARTICLE SIZE
PH VALUE
REACTION KINETICS
SURFACE POTENTIAL
WETTABILITY