Fine Wet Screen (Mwale): Difference between revisions
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Revision as of 04:43, 19 May 2023
Description
This article describes an implementation of the Mwale (Mwale et al., 2016) model for fine wet screening.[1]
Model theory
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Excel
The Mwale fine wet screen model may be invoked from the Excel formula bar with the following function call:
=mdUnit_Screen_Mwale(Parameters as Range, Size as Range, Feed as Range)
Invoking the function with no arguments will print Help text associated with the model, including a link to this page.
Inputs
The required inputs are defined below in matrix notation with elements corresponding to cells in Excel row () x column () format:
where:
- is the kinetic parameter (t/h.m2)
- is a bypass parameter ((t/h)-1)
- is the sharpness parameter (-)
- is the screen open area (m2)
- is the screen aperture (mm)
- is the mass fraction of solids in the feed slurry (w/w)
- is the number of size intervals
- is the size of the square mesh interval that feed mass is retained on (mm)
- , i.e. descending size order from top size () to sub mesh ( mm)
- is the number of ore types
- is feed solids mass flow rate by size and ore type (t/h)
Results
The results are displayed in Excel as an array corresponding to the matrix notation below:
where:
- is the efficiency of undersize removal achieved by the screen (frac)
- is the geometric mean size of particles in size interval (mm)
- is mass flow rate of solids to the oversize stream (t/h)
- is mass flow rate of solids to the undersize stream (t/h)
- is the partition to oversize (frac)
Example
The images below show the selection of input arrays and output results in the Excel interface.
SysCAD
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References
- ↑ Mwale, A.N., Mainza, A.N., Bepswa, P.A., Simukanga, S., Masinja, J.H., 2016. MODEL FOR FINE WET SCREENING. In XXVIII International Mineral Processing Congress Proceedings. Canadian Institute of Mining, Metallurgy and Petroleum.