Behavior of Surfactants in the Suspension of Coal Components

• Published in: Bulletin of the Chemical Society of Japan Vol. 66; no. 6; pp. 1633 - 1639
• Main Authors: Ogura, Tsugitoshi, Tanoura, Masazumi, Hiraki, Akio
• Format: Journal Article
• Language: English
• Published: Tokyo The Chemical Society of Japan 01.06.1993; Chemical Society of Japan
• Subjects: Alternative fuels. Production and utilization; Applied sciences; Energy; Exact sciences and technology; Fuel slurries; Fuels; Alternative fuel; Montmorillonite; Coal water mixture; Bentonite; Surface properties; Kaolinite; Surfactant; Apparent viscosity
• ISSN: 0009-2673; 1348-0634
• DOI: 10.1246/bcsj.66.1633

The roles and behaviors of an anionic surfactant, such as naphthalenesulfonate-formaldehyde condensate (NSF) and poly(styrenesulfonate) (PSS) in the high-loaded suspensions of the Celejon coal with low mineral content (1.2%), carbon black, kaolinite, and montmorillonite were studied. It was found that it is necessary to prepare a slurry of low-viscosity Celejon coal, carbon black and kaolinite in such a way that the surfactant is present as saturatedly adsorbed on the particles as well as being free in water. In the presence of a surfactant, high-loaded suspensions exhibited non-Newtonian fluidity without yield values in their shear-rate and shear stress relation. In contrast, neither NSF nor PSS showed any adsorption on the bentonite particles. Its suspension exhibited a non-Newtonian fluidity with the yield value, even if its concentration was low. The roles of the bentonite were confirmed by adding bentonite to the CWM of Celejon. The CWM of Taiheiyo coal which carried 4.81% montmorillonite suffered a limited coal concentration due to because of a large yield value. Sodium polycarbonate was found to be effective to reduce the yield value, allowing a high coal concentration in CWM.