Model Reference / Component PSD Feeder

Component PSD Feeder

Summary

The Component PSD Feeder model is a DPSIM feed source that builds the output feed stream from component-specific particle size distribution and grade parameters. The model creates an independent Rosin-Rammler-type cumulative passing curve for each project component, then combines the component curves into the final stream PSD and component-by-size matrix.

The model should be used when the feed stream must be generated from user-defined component PSDs rather than entered directly as a single global size distribution. It is useful when different components have different size distributions, such as cases where valuable minerals, gangue minerals, or material groups are expected to have distinct granulometric behavior.

DPSIM model key: DPSIM.Feed.ComponentPSDFeeder
Category: Feed
Subcategory: Feeders
Display name: Component PSD Feeder

Parameters

#	Parameter	Description
1	Feed solid tph	Total dry solids flowrate assigned to the generated feed stream.
2	Feed water m3/h	Water flowrate assigned to the generated feed stream.
3	[Component] d80 (µm)	Component-specific particle size at 80% passing. One d80 parameter is created for each project component.
4	[Component] sharpness	Component-specific size distribution sharpness exponent. Higher values generate a steeper cumulative passing curve.
5	[Component] fines (%)	Component-specific fines offset added to the cumulative passing curve.
6	[Component] grade (%)	Component grade used to distribute the feed solids mass among the project components.

Model Description

The Component PSD Feeder generates a complete feed stream from component-level PSD and grade information.

The model first identifies the number of project components and the number of DPSIM size intervals. For each component, it builds an independent cumulative passing curve using that component’s d80, sharpness exponent, and fines percentage.

The model uses the following constant:

For component c and size class i, the cumulative passing fraction is calculated as:

$P_{c,i} = F_{c} + \left( 1 - F_{c} \right)\left( 1 - \exp\left( \ln(0.2)\left( \frac{d_{i}}{d_{80,c}} \right)^{n_{c}} \right) \right)$

Where:

$P_{c,i}$ = cumulative passing fraction of component c at size class i

$F_{c}$ = fines fraction of component c

$d_{i}$ = particle size of size class i

$d_{80,c}$ = 80% passing size of component c

$n_{c}$ = sharpness exponent of component c

The parameter “Feed water m3/h” is written to the DPSIM water flow field.