Notes on the efficacy of wet versus dry screening of fly ash

B. Valentim, J. C. Hower, D. Flores, A. Guedes

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The methodology used to obtain fly ash subsamples of different sizes is generally based on wet or dry sieving methods. However, the worth of such methods is not certain if the methodology applied is not mentioned in the analytical procedure. After performing a fly ash mechanical dry sieving, the authors compared those results with the ones obtained by laser diffraction on the same samples and found unacceptable discrepancies. A preliminary study of a wet sieving analysis carried out on an economizer fly ash sample showed that this method was more effective than the dry sieving. The importance of standardizing the way samples are handled, pretreated and presented to the instrument of analysis are suggested and interlaboratory reproducibility trials are needed to create a common standard methodology to obtain large amounts of fly ash size fraction subsamples.

Original languageEnglish
Pages (from-to)143-148
Number of pages6
JournalMinerals and Metallurgical Processing
Issue number3
StatePublished - Aug 2008


  • Coal
  • Fly ash
  • Particle size

ASJC Scopus subject areas

  • Control and Systems Engineering
  • General Chemistry
  • Geotechnical Engineering and Engineering Geology
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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