Authors: Crawford, J; Bessett, N

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Crawford, J & Bessett, N 2019, 'Development of centrifugal slurry pumps in tailings disposal and comparison with positive displacement pumps', in AJC Paterson, AB Fourie & D Reid (eds), Proceedings of the 22nd International Conference on Paste, Thickened and Filtered Tailings, Australian Centre for Geomechanics, Perth, pp. 517-530.

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Abstract:
This paper covers FLSmidth KREBS® pump development, over the past 10 years, of an extensive range of highpressure centrifugal slurry pumps for multistage applications. The primary objective has been to produce safe, economical, energy efficient and maintenance friendly centrifugal slurry pumps to fulfil the expanding requirements of the mineral processing industries in the long distance transportation of tailings and mineral slurries. Two ranges of pumps have been developed, a double cased pump (based on the KREBS rubber lined slurryMAX™ XD pump) and an unlined white iron cased pump (based on the millMAX™ pump). The logic behind the development of the two pump ranges will be explained in depth covering the design and first article production, getting it right. The methodology of the hydraulic and structural criteria requirements that are considered during the pumps’ design are integrated with the use of computational fluid dynamics and finite element analysis to ensure that the pumps perform safely, reliably and with maximum efficiency. Application of the pumps to projected operating data is explained taking into consideration specific needs for flange and foundation loads, maintenance and condition monitoring. Consideration of slurry rheology and its implication on pumping performance is discussed. Cost comparison between actual field data and the theoretical positive displacement (PD) costs, as presented at the 21st International Seminar on Paste and Thickened Tailings, will be analysed in the Appendix.

Keywords: energy efficient, safety, rheology, cost comparison

References:
Crawford, J, van Sittert, F & van der Walt, M 2012, ‘The performance of centrifugal pumps when pumping ultra-viscous paste slurries’, in R Jewell, AB Fourie & A Paterson (eds), Proceedings of the 15th International Seminar on Paste and Thickened Tailings, Australian Centre for Geomechanics, Perth, pp. 297–308.
Hydraulics Institute 2009, Rotodynamic Pumps for Pump Piping (ANSI/HI 9.6.6), Hydraulic Institute, Parsippany.
Hydraulic Institute 2016, Rotodynamic (Centrifugal) Slurry Pumps (ANSI/HI 12.1-12.6), Hydraulic Institute, Parsippany.
Newman, C, Crawford, J & Bernhardt, R 2015, ‘Development and experience with multi-stage high pressure pumping using centrifugal slurry pumps’, in S Barrera (ed.), Proceedings of the 3rd International Seminar on Tailings Management, Gecamin Ltda., Santiago.




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