TRANSFER OF O-2 FROM AIR TO MINERAL SLURRIES IN A RUSHTON TURBINE AGITATED TANK

G VANWEERT*, D VANDERWERFF, JJ DERKSEN

*Corresponding author for this work

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Oxygen transfer from dispersed air in agitated slurries represents an important unit operation in the minerals processing industry. Gold leaching, iron precipitation and especially bio-oxidation come readily to mind. However, little engineering information is available on the effect of mineral solids on such O-2 transfer. Engineering literature on the subject, i.e. information which relates slurry density and energy input to O-2 transfer, is reviewed and compared to current experimental work. The latter was carried out with minus 50 micron sand/water slurries in a 64 l laboratory tank of standard proportions, equipped with a standard Rushton turbine and variable speed drive with torque meter.

Results confirm an increasing impairment of O-2 transfer with increasing slurry density. The volumetric mass transfer coefficient k(l)a, in a IO vol.% slurry shows a decrease of 30% compared To the k(l)a in water. At 40 vol.% sand this decrease is near 60%, depending somewhat on superficial gas velocities. Power needed for equivalent oxygen transfer increases even more steeply with slurry density. Experimental results are presented and their significance for slurry bio-oxidation discussed.

Original languageEnglish
Pages (from-to)1109-1124
Number of pages16
JournalMineral Engineering
Volume8
Issue number10
Publication statusPublished - Oct 1995
EventMinerals Engineering 95 - ST IVES
Duration: 14 Jun 199516 Jun 1995

Keywords

  • AERATION
  • MINERAL SLURRIES
  • RUSHTON TURBINE
  • BIOOXIDATION
  • OXYGEN-TRANSFER

Cite this

TRANSFER OF O-2 FROM AIR TO MINERAL SLURRIES IN A RUSHTON TURBINE AGITATED TANK. / VANWEERT, G; VANDERWERFF, D; DERKSEN, JJ.

In: Mineral Engineering, Vol. 8, No. 10, 10.1995, p. 1109-1124.

Research output: Contribution to journalArticle

VANWEERT, G ; VANDERWERFF, D ; DERKSEN, JJ. / TRANSFER OF O-2 FROM AIR TO MINERAL SLURRIES IN A RUSHTON TURBINE AGITATED TANK. In: Mineral Engineering. 1995 ; Vol. 8, No. 10. pp. 1109-1124.
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KW - OXYGEN-TRANSFER

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