Skip to main content
SpringerLink
Log in

‘Ageing’ of Silica Suspensions in Water and its Influence on Flocculation by Polyacrylamide

  • Letter
  • Published:

From Nature

View current issue Submit your manuscript

Abstract

IT has been found that silica and certain silicates undergo a slow change of surface properties when kept in water, their suspensions becoming resistant to flocculation by polyacrylamide. For example, fresh 1 per cent suspensions of the high-purity, amorphous silica ‘Aerosil’ (Dogussa, Germany) are rapidly flocculated by a 0.004 per cent solution of polyacrylamido of high molecular weight, such as ‘Cyanamer P 250’ (American Cyanamid Co., New York); but, after standing for a certain time, ‘Aerosil’ suspensions can no longer be flocculated, even by larger amounts of polyacrylamide (for example, 0.08 per cent). Fig. 1 shows the times required to develop resistance to flocculation in various solutions.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. Imelik, B., Tenth Colston Soc. Symp., edit. by Everett and Stone, 236 (Butterworths, London, 1958). Kiselev, A. V., ibid., 195.

    Google Scholar 

  2. Iler, R. K., J. Phys. Chem., 56, 673 (1952).

    Article  CAS  Google Scholar 

  3. Iler, R. K., The Colloid Chemistry of Silica and Silicates (Cornell Univ. Press, New York, 1955).

    Book  Google Scholar 

  4. Okkerse, C., and De Boer, J. H., Silicates Indust., 27, 195 (1962).

    CAS  Google Scholar 

  5. Kulividze, V. F., Levskaya, N. M., Egova, T. S., Kiselev, V. F., and Sokolov, N. D., Kinetika Kat., 3, 91 (1962).

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Mining and Mineral Technology, Imperial College of Science and Technology, London, S.W.7

    O. GRIOT & J. A. KITCHENER

Authors
  1. O. GRIOT
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. J. A. KITCHENER
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

GRIOT, O., KITCHENER, J. ‘Ageing’ of Silica Suspensions in Water and its Influence on Flocculation by Polyacrylamide. Nature 200, 1004–1005 (1963). https://doi.org/10.1038/2001004b0

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1038/2001004b0

  • Springer Nature Limited

This article is cited by

Search

Navigation