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Clays and Clay Minerals

, Volume 58, Issue 3, pp 311–317 | Cite as

Rheological Properties of Acid-Activated Bentonite Dispersions

  • Hu-Nan Liang
  • Zhu LongEmail author
  • Hui Zhang
  • Shu-Hui Yang
Article

Abstract

Acid-activated bentonites are utilized in many applications, including those that depend on their rheological properties and behavior, but little information is available regarding the rheological characteristics of this important industrial material. The purpose of this study was to investigate the effects of solids concentration, salt concentration, and pH value on the shear rate, shear stress, and other flow parameters of acid-activated bentonite suspensions. Activated Na-bentonite was prepared using sulfuric acid. Flow curves of the suspensions were modeled using the Herschel-Bulkley equation, which performed well for this system. The Herschel-Bulkley yield stress increased with the solids concentration and showed a maximum and minimum at the NaCl concentrations of 0.001 M and 0.01 M, respectively, and increased again slightly with further increases in NaCl concentration. The yield stress was at a maximum and a minimum at pH values of ≈5 and ≈7, respectively, followed by a slight increase with pH under alkaline conditions. The variations in dispersion rheological properties can be attributed to the change in the particle-association modes under different conditions.

Key Words

Acid-activated Bentonite Herschel-Bulkley Model NaCl Concentration pH Solids Concentration 

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References

  1. Banin, A. and Ravikovitch, S. (1966) Kinetics of reactions in the conversion of Na- or Ca-saturated clay to H—Al clay. Clays and Clay Minerals, 14, 193–204.CrossRefGoogle Scholar
  2. Benna, M., Kbir-Ariguib, N., Magnin, A., and Bergaya, F. (1999) Effect of pH on rheological properties of purified sodium bentonite suspensions. Journal of Colloid and Interface Science, 218, 442–455.CrossRefGoogle Scholar
  3. Besq, A., Malfoyb, C., Pantet, A., Monneta, P., and Righib, D. (2003) Physicochemical characterisation and flow properties of some bentonite muds. Applied Clay Science, 23, 275–286.CrossRefGoogle Scholar
  4. Brezovska, S., Marina, B., Burevski D., Angjusheva, B., Bosevska V., and Stojancvska, L. (2005) Adsorption properties and porous structure of sulfuric acid treated bentonites determined by the adsorption isotherms of benzene vapor. Journal of the Serbian Chemical Society, 70, 33–40.CrossRefGoogle Scholar
  5. Chen, J.S., Cushman, J.H., and Low, P.F. (1990) Rheological behavior of Na-montmorillonite suspensions at low electrolyte concentration. Clays and Clay Minerals, 38, 57–62.CrossRefGoogle Scholar
  6. Davey, B.G. and Low, P.F. (1971) Physico-chemical properties of sols and gels of Na-montmorillonite with and without adsorbed hydrous aluminum oxide. Soil Science Society of America Proceedings, 35, 230–236.CrossRefGoogle Scholar
  7. Eisenhour, D. and Reisch, F. (2006) Bentonite. Pp. 357–368 in: Industrial Minerals and Rocks, 7th edition. (Jessica Elzea Kogel, Nikil C. Trivedi, James M. Barker, and Stanley T. Krukowski, editors). The Society for Mining, Metallurgy, and Exploration, Littleton, Colorado, USA.Google Scholar
  8. Grzegorz, J. and Dorota, M.S. (2006) Effect of acid treatment and alkali treatment on nanopore properties of selected minerals. Clays and Clay Minerals, 54, 220–229.CrossRefGoogle Scholar
  9. Günister, E., Güngör, N., and Ece, Ö.I. (2006) The investigations of influence of BDTDACl and DTABr surfactants on rheologic, electrokinetic and XRD properties of Na-activated bentonite dispersions. Materials Letters, 60, 666–673.CrossRefGoogle Scholar
  10. Herschel, W.H. and Bulkley, R. (1926) Konsistenzmessungen von Gummi-Benzollosungen. Kolloid Zeitschrift, 39, 291–300.CrossRefGoogle Scholar
  11. Heyding, R.D., Ironside, R., Norris, A.R., and Pryslazniuk, R.Y. (1960) Acid activation of montmorillonite. Canadian Journal of Chemistry, 38, 1003–1016.CrossRefGoogle Scholar
  12. Janek, M. and Lagaly, G. (2001) Proton saturation and rheological properties of smectite dispersions. Applied Clay Science, 19, 121–130.CrossRefGoogle Scholar
  13. Jovanovic, N.N., Brezovska, S., Burevski, D., Bosevska, V., Danova, B., and Vukovic, Z. (1996) The effect of inorganic acids on the adsorption properties of bentonite. Journal of the Serbian Chemical Society, 61, 453–460.Google Scholar
  14. Komadel, P., Madejova, J., Janek, M., Gates, W.P., Kirkpatrick, R.J., and Stucki, J.W. (1996) Dissolution of hectorite in inorganic acids. Clays and Clay Minerals, 44, 228–236.CrossRefGoogle Scholar
  15. Komadel, P. (2003) Chemically modified smectites. Clay Minerals, 38, 127–138.CrossRefGoogle Scholar
  16. Lagaly, G. and Ziesmer, S. (2003) Colloid chemistry of clay minerals: the coagulation of montmorillonite dispersions. Advances in Colloid and Interface Science, 100, 105–128.CrossRefGoogle Scholar
  17. Londo, M.G., Yang, X.L., and Young, R.H. (2001) Mesoporous Silicoaluminate Pigments for Use in Inkjet and Carbonless Paper coatings. United States Patent 6274226.Google Scholar
  18. Luckham, P.F., and Rossi, S. (1999) The colloidal and rheological properties of bentonite suspensions. Advances in Colloid and Interface Science, 82, 43–92.CrossRefGoogle Scholar
  19. Mills, G.A., Holmes, J., and Cornelius, E.B. (1950) Acid activation of some bentonite clays. Journal of Physics and Colloid Chemistry, 54, 1170–1185.CrossRefGoogle Scholar
  20. Noyan, H., Önal, M. and Sarikaya, Y. (2007) The effect of sulphuric acid activation on the crystallinity, surface area, porosity, surface acidity, and bleaching power of a bentonite. Food Chemistry, 105, 156–163.CrossRefGoogle Scholar
  21. Önal, M., and Sarlkaya, Y. (2007) Preparation and characterization of acid-activated bentonite powders. Powder Technology, 172, 14–18.CrossRefGoogle Scholar
  22. Permien, T. and Lagaly, G. (1994a) The rheological and colloidal properties of bentonite dispersions in the presence of organic compounds: II. Flow behaviour of Wyoming bentonite in water-alcohol. Clay Minerals, 29, 761–766.Google Scholar
  23. Permien, T. and Lagaly, G. (1994b) The rheological and colloidal properties of bentonite dispersions in the presence of organic compounds: IV. Sodium montmorillonite and acids. Applied Clay Science, 9, 251–263.CrossRefGoogle Scholar
  24. Saoussen, L., Jean-Marie, F., Jean-Louis, G., and Nejia Kbir, A. (2006) Effect of pH on the rheological behavior of pure and interstratified smectite clays. Clays and Clay Minerals, 54, 29–37.CrossRefGoogle Scholar
  25. Tombácz, E. and Szekeres, M. (2004) Colloidal behavior of aqueous montmorillonite suspensions: the specific role of pH in the presence of indifferent electrolytes. Applied Clay Science, 27, 75–94.CrossRefGoogle Scholar
  26. Van Olphen, H. (1977) Introduction to Clay Colloid Chemistry, 2und edition. Wiley, New York.Google Scholar
  27. Van Rompaey, K., Van Ranst, E., De Coninck, F., and Vindevogel, N. (2002) Dissolution characteristics of hectorite in inorganic acids. Applied Clay Science, 21, 241–256.CrossRefGoogle Scholar
  28. Yildiz, N., Sarlkaya, Y., and Çalimli, A. (1999) The effect of the electrolyte concentration and pH on the rheological properties of the original and the Na2 CO3-activated Kütahya bentonite. Applied Clay Science, 14, 319–327.CrossRefGoogle Scholar
  29. Zorica, V., Aleksandra, M., Ljiluana, R., Aleksandra R., Zoran, N., and Dusan, J. (2006) The influence of acid treatment on the composition of bentonite. Clays and Clay Minerals, 54, 697–702.CrossRefGoogle Scholar

Copyright information

© The Clay Minerals Society 2010

Authors and Affiliations

  • Hu-Nan Liang
    • 1
    • 2
  • Zhu Long
    • 1
    Email author
  • Hui Zhang
    • 2
  • Shu-Hui Yang
    • 1
  1. 1.Key Laboratory of Eco-Textiles (Jiangnan University)Ministry of EducationWuxiChina
  2. 2.Jiangsu Provincial Key Laboratory of Pulp and Paper Science and TechnologyNanjing Forestry UniversityNanjingChina

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