The Influence of Polysaccharides on Film Stability and Bubble Attachment at the Talc Surface

  • Venkata Atluri
  • Yuesheng Gao
  • Xuming Wang
  • Lei Pan
  • Jan D. MillerEmail author


The wetting characteristics and water film stability at the talc surface have been studied, particularly the effect of polysaccharides such as guar gum, starch, and dextrin. Talc is a gangue mineral in the flotation of base metal sulfide ores, precious metal sulfide ores, and platinum group metal (PGM) sulfide ores. Talc surfaces were investigated using surface analysis techniques including atomic force microscopy, high-speed video bubble attachment measurements, and wetting film stability measurements using a synchronized tri-wavelength reflection interferometry microscope (STRIM). In the presence of polysaccharides, there is a significant increase in bubble attachment time at the talc surface, but only a slight change in contact angle, which suggests that polysaccharide depression of talc is due primarily to the slow rate of bubble attachment and not due to a change in contact angle. The critical rupture thickness (hc) for a hydrophobic talc surface was found to be 56 nm, while the hydrophilic phlogopite surface of similar structure has an equilibrium film thickness (he) of 25 nm. At low polysaccharide concentrations, the wetting films formed on the talc surfaces were unstable, but at high concentrations the wetting films became stable with similar thickness values as the critical rupture thickness, and bubble attachment did not occur. However, it was found that the critical and equilibrium film thickness values do not change significantly with the polysaccharide type or concentration. The results from this research help us understand further details of film rupture and displacement during bubble attachment.


Talc Polysaccharides Hydrophobicity Bubble attachment Film thickness 



Thanks go to Ms. Dorrie Spurlock for her assistance in the preparation of the manuscript.

Funding Information

This work was funded by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the U.S. Department of Energy through Grant No. DE-FG03-93ER14315. We appreciate funding from Newmont USA, Ltd., which helped to support the research program.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.


  1. 1.
    Wie J, Fuerstenau DW (1974) The effect of dextrin on surface properties and the flotation of molybdenite. Int J Miner Process 1(1):17–32CrossRefGoogle Scholar
  2. 2.
    Fuerstenau DW, Huang P (2003) Interfacial phenomena involved in talc flotation and depression. In: Lorenzen L (ed) Proceedings XXII international mineral processing congress, South African Institute of Mining and Metallurgy, Western Cape Branch, Marshalltown, South Africa, vol 2, pp 1034–1043Google Scholar
  3. 3.
    Laskowski JS, Liu Q, Bolin NJ (1991) Polysaccharides in flotation of sulphides. Part I. Adsorption of polysaccharides onto mineral surfaces. Int J Miner Process 33(1–4):223–234CrossRefGoogle Scholar
  4. 4.
    Liu G, Feng Q, Ou L, Lu Y, Zhang G (2006) Adsorption of polysaccharide onto talc. Miner Eng 19(2):147–153CrossRefGoogle Scholar
  5. 5.
    Laskowski JS, Liu Q, O'Connor CT (2007) Current understanding of the mechanism of polysaccharide adsorption at the mineral/aqueous solution interface. Int J Miner Process 84(1):59–68CrossRefGoogle Scholar
  6. 6.
    Mierczynska-Vasilev A, Beattie DA (2013) The effect of impurities and cleavage characteristics on talc hydrophobicity and polymer adsorption. Int J Miner Process 118:34–42CrossRefGoogle Scholar
  7. 7.
    Morris GE, Fornasiero D, Ralston J (2002) Polymer depressants at the talc–water interface: adsorption isotherm, microflotation and electrokinetic studies. Int J Miner Process 67(1):211–227CrossRefGoogle Scholar
  8. 8.
    Shortridge PG, Harris PJ, Bradshaw DJ, Koopal LK (2000) The effect of chemical composition and molecular weight of polysaccharide depressants on the flotation of talc. Int J Miner Process 59(3):215–224CrossRefGoogle Scholar
  9. 9.
    Kaggwa GB, Huynh L, Ralston J, Bremmell K (2006) The influence of polymer structure and morphology on talc wettability. Langmuir 22(7):3221–3227CrossRefGoogle Scholar
  10. 10.
    Beattie DA, Huynh L, Kaggwa GB, Ralston J (2006) Influence of adsorbed polysaccharides and polyacrylamides on talc flotation. Int J Miner Process 78(4):238–249CrossRefGoogle Scholar
  11. 11.
    Rath RK, Subramanian S, Laskowski JS (1997) Adsorption of dextrin and guar gum onto talc. A comparative study. Langmuir 13(23):6260–6266CrossRefGoogle Scholar
  12. 12.
    Liu Q, Zhang Y, Laskowski JS (2000) The adsorption of polysaccharides onto mineral surfaces: an acid/base interaction. Int J Miner Process 60(3):229–245CrossRefGoogle Scholar
  13. 13.
    Jenkins P, Ralston J (1998) The adsorption of a polysaccharide at the talc–aqueous solution interface. Colloids Surf A Physicochem Eng Asp 139(1):27–40CrossRefGoogle Scholar
  14. 14.
    Steenberg E, Harris JP (1984) A study of the adsorption, zeta potential and dispersion characteristics of certain polymers in relation to their effect on the floatability of talc. S Afr J Chem 37:85Google Scholar
  15. 15.
    Atluri V, Jin J, Shrimali K, Dang LX, Wang X, Miller JD (2019) The hydrophobic surface state of talc as influenced by aluminum substitution in the tetrahedral layer. J Colloid Interface Sci. 536:737–748.
  16. 16.
    Wiese J, Harris P, Bradshaw D (2005) The influence of the reagent suite on the flotation of ores from the Merensky reef. Miner Eng 18(2):189–198CrossRefGoogle Scholar
  17. 17.
    O'Connor CT (2013) Investigations into the recovery of platinum group minerals from the platreef ore of the Bushveld Complex of South Africa. Platin Met Rev 57(4):302–310CrossRefGoogle Scholar
  18. 18.
    Wu J, Delcheva I, Ngothai Y, Krasowska M, Beattie DA (2015) Bubble–surface interactions with graphite in the presence of adsorbed carboxymethylcellulose. Soft Matter 11(3):587–599CrossRefGoogle Scholar
  19. 19.
    Shrimali K, Atluri V, Wang X, Miller JD (2018) Adsorption of corn starch molecules at hydrophobic mineral surfaces. Colloids Surf A Physicochem Eng Asp 546:194–202CrossRefGoogle Scholar
  20. 20.
    Gao Y, Pan L (2018) Measurement of instability of thin liquid films by synchronized tri-wavelength reflection interferometry microscope. Langmuir 34(47):14215–14225.
  21. 21.
    Brossard SK, Du H, Miller JD (2008) Characteristics of dextrin adsorption by elemental sulfur. J Colloid Interface Sci 317(1):18–25CrossRefGoogle Scholar
  22. 22.
    Miller JD, Laskowski JS, Chang SS (1983) Dextrin adsorption by oxidized coal. Colloids Surf 8(2):137–151CrossRefGoogle Scholar
  23. 23.
    Beaussart A, Parkinson L, Mierczynska-Vasilev A, Beattie DA (2012) Adsorption of modified dextrins on molybdenite: AFM imaging, contact angle, and flotation studies. J Colloid Interface Sci 368(1):608–615CrossRefGoogle Scholar
  24. 24.
    Mierczynska-Vasilev A, Ralston J, Beattie DA (2008) Adsorption of modified dextrins on talc: effect of surface coverage and hydration water on hydrophobicity reduction. Langmuir 24(12):6121–6127CrossRefGoogle Scholar
  25. 25.
    Knaepen B, Kassinos S, Carati D (2004) Magnetohydrodynamic turbulence at moderate magnetic Reynolds number. J Fluid Mech 513:199–220MathSciNetCrossRefGoogle Scholar
  26. 26.
    Pan L, Yoon RH (2016) Measurement of hydrophobic forces in thin liquid films of water between bubbles and xanthate-treated gold surfaces. Miner Eng 98:240–250CrossRefGoogle Scholar
  27. 27.
    Bozzano G, Dente M (2001) Shape and terminal velocity of single bubble motion: a novel approach. Comput Chem Eng 25(4–6):571–576CrossRefGoogle Scholar

Copyright information

© The Society for Mining, Metallurgy & Exploration 2018

Authors and Affiliations

  1. 1.Department of Metallurgical Engineering, College of Mines and Earth SciencesUniversity of UtahSalt Lake CityUSA
  2. 2.Department of Chemical EngineeringMichigan Technological UniversityHoughtonUSA

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