Concentrated slurry formation via drawdown and incorporation of wettable solids in a mechanically agitated vessel

Research output: Contribution to journalArticlepeer-review

Authors

Colleges, School and Institutes

External organisations

  • Johnson Matthey Technology Centre

Abstract

This paper describes the effect of vessel configurations upon the drawdown and incorporation of floating solids to prepare concentrated alumina slurries in stirred tanks. The impeller speed and power draw required to incorporate all dry powder within four seconds, NJI and PJI, are used to evaluate incorporation performance. The effect of impeller type is assessed, with pitched blade impellers proving to be the most effective across the full range of solid contents considered.

At higher solids content the energy demand is shown to increase dramatically, with a 100-fold increase in energy required to add 1% w/w more solid at 50% by weight compared to 1% by weight. Analysis of impeller power numbers show this coincides with a transition from constant power number to a region where power number increases linearly with decreasing Reynolds number. Contrary to studies at low solids content, the presence of baffles is shown to inhibit drawdown.

Details

Original languageEnglish
Pages (from-to)1885-1895
Number of pages11
JournalAIChE Journal
Volume64
Issue number5
Early online date12 Feb 2018
Publication statusPublished - May 2018

Keywords

  • suspensions, drawdown, floating solids, stirred tank