Dense Medium Cyclone (Dunglison)

Description

This article describes the Dunglison (1999) model for dense medium cyclones. The model is applicable to both minerals (e.g. iron ore, diamonds) and coal separations.

The Dunglison model is a comprehensive description of dense medium cyclone performance, and does not have any parameters that require calibration or "fitting" to plant or laboratory data.

Model theory

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Flowrate and pressure

Volumetric flow rate

Feed inlet pressure

Medium split

Medium:Ore ratio

Medium viscosity

Shear rate

Shi viscosity model

Medium classification

Pulp-split function

Underflow and overflow densities

Medium properties

Ore partitioning

Pulp-split function

Cut density and Ecart Probable

Particle velocity

Centrifugal acceleration

Hindered settling velocity

Feed medium density adjustment

Excel

The Dunglison dense medium cyclone model may be invoked from the Excel formula bar with the following function call:

=mdUnit_DMCyclone_Dunglison(Parameters as Range, Size as Range, Density As Range, Feed as Range, MediumSize as Range, MediumDist 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 ($i$) x column ($j$) format:

${\mathit {Parameters}}={\begin{bmatrix}{\text{Model mode}}\\P_{\rm {i}}{\text{ (Pa)}}\\D_{\rm {c}}{\text{ (m)}}\\D_{\rm {u}}{\text{ (m)}}\\D_{\rm {i}}{\text{ (m)}}\\Q_{\rm {f,med}}{\text{ (m}}^{3}{\text{/h)}}\\\rho _{\rm {cm}}{\text{ (t/m}}^{\text{3}}{\text{)}}\\\rho _{\rm {med}}{\text{ (t/m}}^{\text{3}}{\text{)}}\\{\text{Medium type}}\\{\text{Medium temperature (deg. C)}}\\\rho _{\rm {L}}{\text{ (t/m}}^{\text{3}}{\text{)}}\\(Q_{\rm {M,F}})_{\rm {L}}{\text{ (t/h)}}\\\end{bmatrix}},\;\;\;\;\;\;{\mathit {Size}}={\begin{bmatrix}d_{\rm {ore,1}}{\text{ (mm)}}\\\vdots \\d_{{\rm {ore}},n}{\text{ (mm)}}\\\end{bmatrix}},\;\;\;\;\;\;{\mathit {Density}}={\begin{bmatrix}(\rho _{\rm {s}})_{1}{\text{ (t/m}}^{\text{3}}{\text{)}}&\dots &(\rho _{\rm {s}})_{m}{\text{ (t/m}}^{\text{3}}{\text{)}}\\\end{bmatrix}},\;\;\;\;\;\;{\mathit {Feed}}={\begin{bmatrix}(Q_{\rm {M,F}})_{11}{\text{ (t/h)}}&\dots &(Q_{\rm {M,F}})_{1m}{\text{ (t/h)}}\\\vdots &\ddots &\vdots \\(Q_{\rm {M,F}})_{n1}{\text{ (t/h)}}&\dots &(Q_{\rm {M,F}})_{nm}{\text{ (t/h)}}\\\end{bmatrix}}$

${\mathit {MediumSize}}={\begin{bmatrix}d_{\rm {med,1}}{\text{ (mm)}}\\\vdots \\d_{{\rm {med}},p}{\text{ (mm)}}\\\end{bmatrix}},\;\;\;\;\;\;{\mathit {MediumDist}}={\begin{bmatrix}w_{\rm {med,1}}{\text{ (frac)}}\\\vdots \\w_{{\rm {med}},p}{\text{ (frac)}}\\\end{bmatrix}}\;\;\;\;\;\;$

where:

• ${\text{Model mode}}$ specifies the flow-pressure calculation mode to apply (0 = Compute flow rate at specified pressure, 1 = Compute pressure at specified flow rate)
• $Q_{\rm {f,med}}$ is the volumetric flow rate of medium in the cyclone feed (m³/h)
• ${\text{Medium type}}$ specifies the type of solid media (0 = Atomised FeSi, 1 = Milled FeSi, 2 = Magnetite)
• ${\text{Medium temperature}}$ is the temperature of the medium (deg. C)
• $Q_{\rm {M,F}}$ is feed solids mass flow rate by size and ore type (t/h)
• $\rho _{\rm {S}}$ is the particle density (t/m³)

Results

The results are displayed in Excel as an array corresponding to the matrix notation below:

${\mathit {mdUnit\_DMCcyclone\_Dunglison}}={\begin{bmatrix}{\begin{array}{c}{\begin{bmatrix}M_{\rm {f}}{\text{ (kg/s)}}\\\rho _{\rm {ore}}{\text{ (t/m}}^{3}{\text{)}}\\\rho _{\rm {f}}{\text{ (t/m}}^{3}{\text{)}}\\Q_{\rm {f}}{\text{ (m}}^{3}{\text{/s)}}\\Q_{\rm {f,med}}{\text{ (m}}^{3}{\text{/s)}}\\R_{\rm {m}}{\text{ (frac)}}\\R_{\rm {ms}}{\text{ (frac)}}\\R_{\rm {ml}}{\text{ (frac)}}\\V_{\rm {c}}{\text{ (m/s)}}\\P_{\rm {I}}{\text{ (kPa)}}\\{\text{Head (}}D_{\rm {c}}{\text{)}}\\{\text{Shear rate (s}}^{-1}{\text{)}}\\\mu {\text{ (kg/m.s)}}\\{\text{Radius (m)}}\\V_{\rm {inlet}}{\text{ (m/s)}}\\\alpha _{\rm {inlet}}{\text{ (-)}}\\V_{\rm {t}}{\text{ (m/s)}}\\a_{\rm {c}}{\text{ (m/s}}^{2}{\text{)}}\\{\text{MO (v/v)}}\\\phi _{\rm {ore}}{\text{ (v/v)}}\\\phi _{\rm {med}}{\text{ (v/v)}}\\{\text{Re}}_{\rm {c}}{\text{ (-)}}\\b_{\rm {med}}{\text{ (/m)}}\\C_{\rm {vu}}{\text{ (v/v)}}\\\rho _{\rm {u}}{\text{ (t/m}}^{3}{\text{)}}\\\rho _{\rm {o}}{\text{ (t/m}}^{3}{\text{)}}\\b_{\rm {ore}}{\text{ (/m)}}\\\rho _{\rm {50c}}{\text{ (t/m}}^{3}{\text{)}}\\c{\text{ (kg/m}}^{2}{\text{)}}\\P_{\rm {All}}{\text{ (frac)}}\\(Q_{\rm {M,UF}})_{\rm {L}}{\text{ (t/h)}}\\(Q_{\rm {M,OF}})_{\rm {L}}{\text{ (t/h)}}\\\end{bmatrix}}\end{array}}{\begin{array}{cccccccc}{\begin{bmatrix}{\bar {d}}_{\rm {med,1}}{\text{ (mm)}}\\\vdots \\{\bar {d}}_{{\rm {med}},p}{\text{ (mm)}}\end{bmatrix}}&{\begin{bmatrix}P_{\rm {med,1}}{\text{ (frac)}}\\\vdots \\P_{{\rm {med}},p}{\text{ (frac)}}\end{bmatrix}}&{\begin{bmatrix}(Q_{\rm {M,UF}})_{11}{\text{ (t/h)}}&\dots &(Q_{\rm {M,UF}})_{1m}{\text{ (t/h)}}\\\vdots &\ddots &\vdots \\(Q_{\rm {M,UF}})_{n1}{\text{ (t/h)}}&\dots &(Q_{\rm {M,UF}})_{nm}{\text{ (t/h)}}\\\end{bmatrix}}&{\begin{bmatrix}(Q_{\rm {M,OF}})_{11}{\text{ (t/h)}}&\dots &(Q_{\rm {M,OF}})_{1m}{\text{ (t/h)}}\\\vdots &\ddots &\vdots \\(Q_{\rm {M,OF}})_{n1}{\text{ (t/h)}}&\dots &(Q_{\rm {M,OF}})_{nm}{\text{ (t/h)}}\\\end{bmatrix}}&{\begin{bmatrix}{\bar {d}}_{\rm {ore,1}}{\text{ (mm)}}\\\vdots \\{\bar {d}}_{{\rm {ore}},p}{\text{ (mm)}}\end{bmatrix}}&{\begin{bmatrix}Y_{11}{\text{ (frac)}}&\dots &Y_{1m}{\text{ (frac)}}\\\vdots &\ddots &\vdots \\Y_{n1}{\text{ (frac)}}&\dots &Y_{nm}{\text{ (frac)}}\\\end{bmatrix}}&{\begin{bmatrix}P_{1,{\rm {All}}}{\text{ (frac)}}\\\vdots \\P_{n,{\rm {All}}}{\text{ (frac)}}\\\end{bmatrix}}&{\begin{array}{c}{\begin{bmatrix}P_{{\rm {All}},1}{\text{ (frac)}}&\dots &P_{{\rm {All}},m}{\text{ (frac)}}\\\end{bmatrix}}\\\\\\\end{array}}&{\begin{bmatrix}\rho _{50,1}{\text{ (t/m}}^{3}{\text{)}}\\\vdots \\\rho _{50,n}{\text{ (t/m}}^{3}{\text{)}}\\\end{bmatrix}}&{\begin{bmatrix}E_{{\rm {p}},1}{\text{ (t/m}}^{3}{\text{)}}\\\vdots \\E_{{\rm {p}},n}{\text{ (t/m}}^{3}{\text{)}}\\\end{bmatrix}}\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\end{array}}\end{bmatrix}}$

where:

• ${\bar {d}}_{{\rm {med}},k}$ (m) is the geometric mean size of a medium particle in size interval $k$ (mm)
• $Q_{\rm {M,UF}}$ is mass flow rate of solids to the underflow (sinks) stream (t/h)
• $Q_{\rm {M,OF}}$ is mass flow rate of solids to the overflow (floats) stream (t/h)
• $P_{\rm {All}}$ is the actual partition of all mass to the sinks stream, computed as ${\frac {\sum _{i=1}^{n}\sum _{j=1}^{m}(Q_{\rm {M,UF}})_{ij}}{\sum _{i=1}^{n}\sum _{j=1}^{m}(Q_{\rm {M,F}})_{ij}}}$ (frac)
• $P_{i,{\rm {All}}}$ is the actual partition of all particles of size $i$ to the underflow (sinks) stream, computed as ${\frac {\sum _{j=1}^{m}(Q_{\rm {M,UF}})_{ij}}{\sum _{j=1}^{m}(Q_{\rm {M,F}})_{ij}}}$ (frac)
• $P_{{\rm {All}},i}$ is the actual partition of all particles of density class $j$ to the underflow (sinks) stream, computed as ${\frac {\sum _{i=1}^{n}(Q_{\rm {M,UF}})_{ij}}{\sum _{i=1}^{n}(Q_{\rm {M,F}})_{ij}}}$ (frac)

Example

The images below show the selection of input arrays and output results in the Excel interface.

Figure 2. Example showing the selection of the Parameters (blue frame) array in Excel.

Figure 3. Example showing the selection of the Size (red frame), Feed (green frame), Density (purple frame), MediumSize (pink frame), and MediumDist (brown frame) arrays in Excel.

Figure 4. Example showing the outline of the left side of the Results array (shaded area) in Excel.

Figure 5. Example showing the outline of the right side of the Results array (shaded area) in Excel.

SysCAD

MD_DenseMedium page

The first tab page in the access window will have this name.

Tag (Long/Short)	Input / Display	Description/Calculated Variables/Options
Tag	Display	This name tag may be modified with the change tag option.
Condition	Display	OK if no errors/warnings, otherwise lists errors/warnings.
ConditionCount	Display	The current number of errors/warnings. If condition is OK, returns 0.
GeneralDescription / GenDesc	Display	This is an automatically generated description for the unit. If the user has entered text in the 'EqpDesc' field on the Info tab (see below), this will be displayed here. If this field is blank, then SysCAD will display the unit class ID.
Requirements
On	CheckBox	This enables the unit. If this box is not checked, then the MassFracToSinks option appears below.
MassFracToSinks	Input	Only appears if the On field above is not checked. Specifies the fraction of feed mass that reports to the sinks stream when the model is off.
NumParallelUnits	Input	The number of parallel, identical units to simulate: Feed is divided by the number of parallel units before being sent to the unit model. Unit model products are multiplied back by the same value and returned to the SysCAD product streams. All unit model result values are shown per parallel unit.
Method	Partition (User)	The partition to sinks for each size interval and species is defined by the user.
	Partition (Rho50-Ep)	The partition to sinks for each species and size interval is defined by the Rh050-Ep model.
	Partition (Pivot)	The partition to sinks for each species and size interval is defined by the Pivot model.
	Partition (Stochastic)	The partition to sinks for each species and size interval is defined by the Stochastic model.
	Drum (Baguley)	The Baguley dense medium drum model is used to determine the partition of solids to sinks and floats for each species and size interval.
	Cyclone (Dunglison)	The Dunglison dense medium cyclone model is used to determine the partition of solids to sinks (underflow) and floats (overflow) for each species and size interval.
Options
ShowQFeed	CheckBox	QFeed and associated tab pages (eg Sp) will become visible, showing the properties of the combined feed stream.
ShowQSinks	CheckBox	QSinks and associated tab pages (eg Sp) will become visible, showing the properties of the sinks stream.
ShowQFloats	CheckBox	QFloats and associated tab pages (eg Sp) will become visible, showing the properties of the floats stream.
SizeForPassingFracCalc	Input	Size fraction for % Passing calculation. The size fraction input here will be shown in the Stream Summary section.
FracForPassingSizeCalc	Input	Fraction passing for Size calculation. The fraction input here will be shown in the Stream Summary section.
Stream Summary
MassFlow / Qm	Display	The total mass flow in each stream.
SolidMassFlow / SQm	Display	The Solids mass flow in each stream.
LiquidMassFlow / LQm	Display	The Liquid mass flow in each stream.
VolFlow / Qv	Display	The total Volume flow in each stream.
Temperature / T	Display	The Temperature of each stream.
Density / Rho	Display	The Density of each stream.
SolidFrac / Sf	Display	The Solid Fraction in each stream.
LiquidFrac / Lf	Display	The Liquid Fraction in each stream.
Passing	Display	The mass fraction passing the user-specified size (in the field SizeForPassingFracCalc) in each stream.
Passes	Display	The user-specified (in the field FracForPassesSizeCalc) fraction of material in each stream will pass this size fraction.

Cyclone page

The Cyclone page is used to specify the required model method and associated input parameters.

Tag (Long/Short)	Input / Display	Description/Calculated Variables/Options
DMCyclone
HelpLink		Opens a link to this page using the system default web browser. Note: Internet access is required.
Mode	Compute Flow	The model computes the cyclone volumetric flow rate at the specified feed inlet pressure.
	Compute Pressure	The model computes the feed inlet pressure required to achieve the specified feed volumetric flow rate.
Parameters
FeedPressure / Pi	Input / Display	Feed inlet pressure of the cyclone
CycloneDiameter / Dc	Input	Diameter of the cylindrical section of the cyclone.
ApexDiameter / Du	Input	Diameter of the cyclone apex (underflow) discharge.
InletDiameter / Di	Input	Diameter (equivalent) of the inlet to the cyclone.
Medium
MediumSolids	Input / List	Specifies which species should be considered as the medium solids by the model. The drop down list will contain all solids species in the project, plus "-" for no selection. See Medium solids for more information.
MediumType	Atomised FeSi	The dense media is atomised ferrosilicon.
	Milled FeSi	The dense media is milled ferrosilicon.
	Magnetite	The dense media is milled magnetite.
Feed.Medium.VolFlow / QfMed	Input / Display	The volumetric flow rate of feed medium to the cyclone.
CorrectMediumDensity / Rhocm	Input / Display	The density of the correct medium.
MediumSolidsDensity / Rhom	Input / Display	The density of the medium solids.
MediumTemperature / T	Input / Display	The temperature of the feed medium.
Liquids
LiquidsSeparMethod	Split To Sinks (User)	Liquids are split to sinks by a user-defined fraction of liquids in the feed.
	Split To Sinks (Model)	Liquids are split to sinks by a fraction determined by the selected model.
	Sinks Solids Fraction	Sufficient liquids mass is recovered to the sinks stream to yield the user-defined sinks solids mass fraction value (if possible).
	Sinks Liquids Fraction	Sufficient liquids mass is recovered to the sinks stream to yield the user-defined sinks liquids mass fraction value (if possible).
SinksSolidsFracReqd / Sinks.SfReqd	Input	Required value of the mass fraction of solids in the sinks stream. Only visible if Sinks Solids Fraction is selected.
SinksLiquidsFracReqd / Sinks.LfReqd	Input	Required value of the mass fraction of liquids in the sinks stream. Only visible if Sinks Liquids Fraction is selected.
LiqSplitToSinks / Sinks.LiqSplit	Input/Display	The fraction of feed liquids recovered to the sinks stream.
Results
Feed.SolidMassFlow / Mf	Display	Mass flow of ore solids in cyclone feed.
Feed.OreDensity / RhoOre	Display	Mean density of all ore solids in cyclone feed.
Feed.Medium.SolVolFrac / Cvf	Display	Volume fraction of solids in feed medium.
Feed.Medium.Density / Rhof	Display	Density of feed medium to cyclone.
Feed.VolFlow / Qf	Display	Volumetric flow rate of feed to cyclone.
MediumOreRatio / MO	Display	Medium to ore volume ratio.
Feed.OreSolVolFrac / PhiOre	Display	Volume concentration of ore in cyclone feed.
Feed.MedSolVolFrac / PhiMed	Display	Volume concentration of medium solids in cyclone feed.
MediumSplitToUF / Rm	Display	Fractional split of feed medium to underflow (sinks) stream.
MediumSolSplitToUF / RmSolids	Display	Fractional split of feed medium solids to underflow (sinks) stream.
MediumLiqSplitToUF / RmLiquids	Display	Fractional split of feed medium liquids to underflow (sinks) stream.
MediumVelocity / Vc	Display	Velocity of medium in the cyclone.
PressureHead / Head	Display	Pressure head to cyclone feed in multiples of cyclone diameter (Dc).
ShearRate / GammaDot	Display	Shear rate of medium in cyclone.
MediumP80	Display	80% passing size of the medium solids.
MediumP20	Display	20% passing size of the medium solids.
ApparentViscosity / mu	Display	Apparent viscosity of medium in cyclone.
AccelRadius / Radius	Display	Radius of centrifugal acceleration.
InletVelocity / Vinlet	Display	Velocity of cyclone feed at inlet.
InletVelLossFactor / alphaInlet	Display	Inlet velocity loss factor.
TangentialVelocity / Vt	Display	Tangential velocity of flow in the cyclone.
CentrifugalAccel / ac	Display	Centrifugal acceleration of flow in the cyclone.
ReynoldsNumber / Rec	Display	Reynolds Number of flow in the cyclone.
MedIneffExponent / bMed	Display	Medium inefficiency exponent.
UF.Medium.SolVolFrac / Cvu	Display	Volume fraction of solids in underflow medium.
UF.Medium.Density / Rhou	Display	Density of medium in the underflow.
OF.Medium.Density / Rhoo	Display	Density of medium in the overflow.
OreIneffExponent / bOre	Display	Ore inefficiency exponent.
CoarseCutDensity / Rho50c	Display	Cut density of coarse particles in cyclone.
CutDensityParameter / c	Display	Cut density parameter.
CutDensity / Rho50	Display	Unsized cut density (Rho50).
EcartProbable / Ep	Display	Unsized Ecart Probable (Ep).
Imperfection / I	Display	Unsized partition Imperfection (I).

MediumSz page

The MediumSz page is used to specify the size distribution properties of the dense medium solids.

Tag (Long/Short)	Input / Display	Description/Calculated Variables/Options
MediumSz
NumMediumSizes	Input / Display	Number of medium solids particle size intervals.
Size	Input / Display	Size of each interval in medium mesh series.
MeanSize	Display	Geometric mean size of each interval in medium mesh series.
WtMedium	Input / Display	Mass fraction of medium solids per size interval.
YiMedium	Input / Display	The partition to underflow (sink) of medium solids per size interval.
All	Input / Display	Actual overall recovery of all medium solids to underflow (sinks).

Partition page

The Partition page is used to display (or specify) the partition by species/component/element/individual phase and size values.

Tag (Long/Short)	Input / Display	Description/Calculated Variables/Options
Distribution
Name	Display	Shows the name of the SysCAD Size Distribution (PSD) quality associated with the feed stream.
IntervalCount	Display	Shows the number of size intervals in the SysCAD Size Distribution (PSD) quality associated with the feed stream.
SpWithPSDCount	Display	Shows the number of species in the feed stream assigned with the SysCAD Size Distribution (PSD) quality.
Partition
Method	Model / User	Select model-calculated or user-defined partition to separate each solids species type.
Density	Display	Density of each solid species.
Size	Display	Size of each interval in mesh series.
MeanSize	Display	Geometric mean size of each interval in mesh series.
All (All column)	Display	Actual overall partition to sinks of all solid species, for each size interval. Excludes solid species not present in the dense medium separator feed.
Partition	Display	Partition to sinks for each size interval, in each solid species, as determined by the selected model or user defined value. Note: These values are displayed regardless of whether the solid species is present in the dense medium separator feed or not.
All (All row, All column)	Display	Displays the actual, total, partition of all solids with a particle size distribution property in the feed to sinks. Excludes solid species not present in the dense medium separator feed.
All (All row, per species)	Display	Actual overall partition to sinks for each solid species, for all size intervals in that species. Excludes solid species not present in the dense medium separator feed.
CmpPartition
Components		Hides or shows component partition table.
Size	Display	Size of each interval in mesh series.
MeanSize	Display	Geometric mean size of each interval in mesh series.
All (All column)	Display	Actual overall partition to sinks of all solid components, for each size interval. Excludes solid components not present in the dense medium separator feed.
CmpPartition	Display	Partition to sinks for each size interval, in each solid component, as determined by the selected model or user defined value. Excludes solid components not present in the dense medium separator feed.
All (All row, All column)	Display	Displays the actual, total, partition of all solid components with a particle size distribution property in the feed to sinks. Excludes solid components not present in the dense medium separator feed.
All (All row, per component)	Display	Actual overall partition to sinks for each solid component, for all size intervals in that component. Excludes solid components not present in the dense medium separator feed.
ElePartition
Elements		Hides or shows element partition table.
Size	Display	Size of each interval in mesh series.
MeanSize	Display	Geometric mean size of each interval in mesh series.
All (All column)	Display	Actual overall partition to sinks of all solid elements, for each size interval. Excludes solid elements not present in the dense medium separator feed.
ElePartition	Display	Partition to sinks for each size interval, in each solid element, as determined by the selected model or user defined value. Excludes solid elements not present in the dense medium separator feed.
All (All row, All column)	Display	Displays the actual, total, partition of all solid elements with a particle size distribution property in the feed to sinks. Excludes solid elements not present in the dense medium separator feed.
All (All row, per element)	Display	Actual overall partition to sinks for each solid element, for all size intervals in that component. Excludes solid elements not present in the dense medium separator feed.
IPhPartition
IPhases		Hides or shows individual phases partition table.
Size	Display	Size of each interval in mesh series.
MeanSize	Display	Geometric mean size of each interval in mesh series.
All (All column)	Display	Actual overall partition to sinks of all solid individual phases, for each size interval. Excludes solid individual phases not present in the dense medium separator feed.
IPhPartition	Display	Partition to sinks for each size interval, in each solid individual phase, as determined by the selected model or user defined value. Excludes solid individual phases not present in the dense medium separator feed.
All (All row, All column)	Display	Displays the actual, total, partition of all solid individual phases with a particle size distribution property in the feed to sinks. Excludes solid individual phases not present in the dense medium separator feed.
All (All row, per individual phase)	Display	Actual overall partition to sinks for each solid individual phase, for all size intervals in that component. Excludes solid individual phases not present in the dense medium separator feed.

About page

This page is provides product and licensing information about the Met Dynamics Models SysCAD Add-On.

Tag (Long/Short)	Input / Display	Description/Calculated Variables/Options
About
HelpLink		Opens a link to the Installation and Licensing page using the system default web browser. Note: Internet access is required.
Information		Copies Product and License information to the Windows clipboard.
Product
Name	Display	Met Dynamics software product name
Version	Display	Met Dynamics software product version number.
BuildDate	Display	Build date and time of the Met Dynamics Models SysCAD Add-On.
License
File		This is used to locate a Met Dynamics software license file.
Location	Display	Type of Met Dynamics software license or file name and path of license file.
SiteCode	Display	Unique machine identifier for license authorisation.
ReqdAuth	Display	Authorisation level required, MD-SysCAD Full or MD-SysCAD Runtime.
Status	Display	License status, LICENSE_OK indicates a valid license, other messages report licensing errors.
IssuedTo	Display	Only visible if Met Dynamics license file is used. Name of organisation/seat the license is authorised to.
ExpiryDate	Display	Only visible if Met Dynamics license file is used. License expiry date.
DaysLeft	Display	Only visible if Met Dynamics license file is used. Days left before the license expires.

Medium solids

This model allows the user to designate any single SysCAD solids species in the project as the medium solids. Alternatively, no medium solids may be specified (default: "-").

The selected option determines how the medium solids species is treated by the model:

Default: -:

• The medium properties required by the model (Feed.Medium.VolFlow, CorrectMediumDensity, MediumSolidsDensity, MediumTemperature, and Size/WtMedium) are specified by the user.
• All solids species in the feed stream that possess the PSD property are partitioned by the model based on their size and density characteristics.
• The All partition values shown on the Partition page include contributions from all species.
• All solids species in the feed stream that do not possess the PSD property are split by the model based on default behaviour (see Additional notes).

[Species Name]:

• The medium properties required by the model (Feed.Medium.VolFlow, CorrectMediumDensity, and MediumSolidsDensity are determined by the properties of the selected medium solids species and all liquids in the feed.
• If the SysCAD heat calculations are enabled (Edit, Project Settings, Heat Calculations), the MediumTemperature is determined by the mixed temperature of all feed streams. Otherwise, MediumTemperature is user-specified.
• If the selected medium solids species possesses the size distribution property (PSD):
  • The Size/WtMedium properties are determined by the PSD of the medium solids species in the feed stream.
  • The selected medium species is partitioned according to the medium classification (YiMedium) determined by the model.
  • The partition-by-size values for the medium species on the Partition page are displayed as zeroes.
  • The All partition values on the Partition page exclude the medium species.
• If the selected medium solids species does not possess the PSD property:
  • The Size/WtMedium values are user-specified.
  • The selected medium solids species split to the sinks stream is determined by the RmSolids model parameter.

Additional notes

• Solid species that do not possess a particle size distribution property are split according to the overall mass split of the default particle size distribution species selected in the SysCAD Project Configuration.
• If the default particle size distribution species is not present in the unit feed, the overall split of all other species with particle size distributions combined is used, as determined by the model.
• Gas phase species report directly to the tail/floats stream without split.

See also

• Properties (Dense Medium Viscosity)

External links

• Met Dynamics - Dense Medium Separator (help.syscad.net)
• Gravity, Dense Medium, and Magnetic Separation Example project (help.syscad.net)