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Analysis of flow patterns inside the stirred tank used in alumina refinery

conference contribution
posted on 06.12.2017, 00:00 by C Hooley, Mohammad Rasul, Alexandre Deev
In this study, the turbulent flow patterns inside two model tanks were analysed using video camera in order to determine possible causes of undesirable formations of gibbsite sediments that are occurring at the bottom of precipitation tanks in the alumina refinery. The two tanks were geometrically similar and were of 1500L and 200L respectively each with a height equal to 1.2D and agitated with three pitched blade impellers of diameter 0.5D. The flow patterns were highlighted by the addition of polystyrene particles and were analysed through video camera recordings. The tanks revealed complex flow patterns that were not able to be fully analysed through the use video cameras. However, flow patterns were observed and analysed on a visual basis. Of notice was a complex region of flow that contained erratic fluctuations between radial and axial flow patterns. The erratic behaviour of this complex region of flow frequently amplified out to the tank walls and bottom causing brief stagnation periods and periods of uncharacteristic flow patterns. These results were verified with both tank sizes.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Start Page

55

End Page

62

Number of Pages

8

Start Date

01/01/2008

ISBN-10

0858258234

Location

Newcastle, N.S.W.

Publisher

Engineers Australia

Place of Publication

Australia

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Faculty of Sciences, Engineering and Health; Institute for Resource Industries and Sustainability (IRIS); Process Engineering and Light Metals;

Era Eligible

Yes

Name of Conference

Chemeca.

Exports

CQUniversity

Exports