Agglomeration and flotation of alumina clusters in molten steel

Hirokazu Tozawa, Yoshiei Kato, Kenichi Sorimachi, Tomomi Nakanishi

Research output: Contribution to journalArticlepeer-review

132 Citations (Scopus)


An equation for the floating velocity of cluster-shaped alumina inclusions which considers changes in average density was derived by quantifying the size and density of alumina clusters using fractal theory. The results obtained showed that the dependency of the floating velocity on the cluster diameter is smaller than in the conventional equations, which assume that clusters have a uniform average density. In particular, the floating velocity of clusters 100 μm and over is considerably smaller than the conventional floating velocity. A model of the coalescence of cluster-shaped inclusions was also constructed, and the behavior of alumina clusters in molten steel in the tundish of an actual continuous casting machine was analyzed considering floating characteristics and agglomeration. The calculated results showed good agreement with the results measured in the actual machine, demonstrating that it is possible to simulate the coalescence and floating separation of cluster inclusions in molten steel with this model.

Original languageEnglish
Pages (from-to)426-434
Number of pages9
Journalisij international
Issue number5
Publication statusPublished - 1999
Externally publishedYes

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


Dive into the research topics of 'Agglomeration and flotation of alumina clusters in molten steel'. Together they form a unique fingerprint.

Cite this