Oxygen transfer in agitated silica and pyrite slurries

JJ Derksen*, K Buist, G Van Weert, MA Reuter

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Oxygen transfer measurements in agitated mineral slurries were carried out in a 67 l laboratory tank. Two impellers (a Rushton turbine and a Lightnin A315) and two types of solid particles (silica, d(50)=13 mu m, and pyrite, d(50)=14 mu m) were investigated. Next to the volumetric oxygen transfer rate k(L)a, local bubble sizes, the overall gas hem-zip in the tank, and the power input were measured The silica and pyrite slurries behaved remarkably different with respect to the oxygen transfer as a function of the solids fr action. The pyrite particles increase k(L)a, whereas silica impairs oxygen transfer. The bubble size measurements indicate that the increased k(L)a in pyrite slurries is related to an increased interfacial area in the tank. (C) 1999 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)25-36
Number of pages12
JournalMineral Engineering
Volume13
Issue number1
Publication statusPublished - Jan 2000

Keywords

  • agitation
  • bioleaching

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