A dense medium cyclone model based on the pivot phenomenon

Scott, I. A. and Napier-Munn, T. J. (1992) A dense medium cyclone model based on the pivot phenomenon. Transactions of the Institute of Mining and Metallurgy Section C Mineral Processing and Extractive Metallurgy, 101 C61-C76.

Author Scott, I. A.
Napier-Munn, T. J.
Title A dense medium cyclone model based on the pivot phenomenon
Journal name Transactions of the Institute of Mining and Metallurgy Section C Mineral Processing and Extractive Metallurgy   Check publisher's open access policy
ISSN 0371-9553
1743-2855
Publication date 1992-05
Sub-type Article (original research)
Open Access Status
Volume 101
Start page C61
End page C76
Total pages 16
Place of publication Leeds, W Yorks, United Kingdom
Publisher Maney Publishing
Language eng
Formatted abstract
It is shown that size-by-size partition curves for the separation of minerals in dense-medium cyclones 'pivot' about a single point whose coordinates are characteristic of the separation. For stable, non-segregating media this point is defined by the density of the medium and the proportion of the medium reporting to the underflow. For unstable (conventional) media the pivot point departs from these values. A four-parameter equation has been developed to represent the phenomenon; two parameters define the coordinates of the pivot point and two define the Ep value.

On the basis of experiments in a 200-mm cyclone using ferrosilicon media simple regression equations were developed for the separation parameters in terms of operating conditions (the coefficients in these equations are likely to be site-specific). The experiments successfully decoupled the effects of medium density and viscosity, and it is shown that the value of Ep is independent of density but strongly dependent on viscosity. A classification model is used to predict the density of the underflow medium, a knowledge of which is required to determine the pivot parameters.

The model correctly reflects the performance trends that are observed in dense-medium cyclone operation and has the potential to be generalized to a wide range of industrial practice.
Keyword Seperation processes
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Julius Kruttschnitt Mineral Research Centre Publications
 
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Created: Thu, 09 Apr 2015, 11:24:27 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre