Apex water injection for improved hydrocyclone classification efficiency

R. Q. Honaker, A. V. Ozsever, N. Singh, B. K. Parekh

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Classifying cyclones are a widely used device for achieving ultrafine particle size separations in industrial applications. However, inherent deficiencies include particle density effects in multi-component suspensions and ultrafine particle short-circuiting to the underflow stream due to hydraulic entrainment. A detailed in-plant test program has been conducted to evaluate the benefits of tangential water injection into the apex portion of a classification cyclone for the removal or minimization of the ultrafine by-pass. Based on models developed using the test results, ultrafine by-pass can be reduced by 50% or more while maintaining the same corrected d50 value through complex manipulation of operating and geometric parameters. In a subsequent test, the by-pass was reduced from 15% to about 7% while maintaining a d50(c) value of 26 microns. However, the magnitude of the benefit in by-pass reduction is subject to the geometric parameters of the conventional classifying cyclone.

Original languageEnglish
Pages (from-to)1445-1457
Number of pages13
JournalMinerals Engineering
Issue number11
StatePublished - Nov 2001

Bibliographical note

Funding Information:
The work presented in this publication was funded in parl by' the W. S. Department of Energy (Project Contract No.: DE-AC26-98FT40152). Thc authors express appreciation to Mr. Carl Maronde for his technical support and Mr. John Wiseman for assisting with the apparatus and sample analyses.


  • Classification
  • Coal
  • Fine particle processing
  • Hydrocyclones
  • Modeling

ASJC Scopus subject areas

  • Control and Systems Engineering
  • General Chemistry
  • Geotechnical Engineering and Engineering Geology
  • Mechanical Engineering


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