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> M i n e r a l P r o c e s s i n g > E n g i n e e r i n g D e s i g n > T r a i n i n g > S p e c i a l i s t S e r v i c e s
Perth | Brisbane | Melbourne |Newcastle|Noosa
Midas Engineering Group Pty Ltd
ABN 72 159 772 675
W: www.midasengineering.com.auE: [email protected]
5th Annual FeTech Conference 2014
Criteria for Selecting a Jig or DMS process
Presented by John Visser
Mineral Engineering Technical Services
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> DISCLAIMERWith respect to all the information contained herein, neither Mineral Engineering Technical Services Pty Ltd, nor
any officer, servant, employee, agent or consultant thereof make any representations or give any warranties,
expressed or implied, as to the accuracy, reliability or completeness of the information contained herein, including
but not limited to opinions, information or advice which may be provided to users of the document. No
responsibility is accepted to users of this document for any consequence of relying on the contents hereof.
> COPYRIGHT Passing of this document to a third party, duplication or re-use of this document, in whole or part, electronically or
otherwise, is not permitted without the expressed written consent of Mineral Engineering Technical Services Pty
Ltd.
> ACKNOWLEDGEMENTSThis document is a dynamic record of the knowledge and experience of personnel at Mineral Engineering
Technical Services. As such it has been built upon over the years and is a collaborative effort by all those
involved. We are thankful for the material supplied by and referenced from various equipment manufacturers,
vendors, industry research and project partners.
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Key Attributes
Working globally since 1988
Dynamic and innovative niche consultancy
Dedicated team providing customised service
Specialist in Mineral Processing & Engineering Projects
Unique solution finder
Pragmatic, efficient, complete engineering through
quality, personalised & exceptional service delivery
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Overview
Introduction
Criteria for selection
Jig Setup
DMS Setup
Case studies
Capex and Opex
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Introduction
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Introduction
Both machines upgrade material
Significant difference in particle sgbetween discard and product
Size distribution < 40mm nominally
Wet processes
The processes can be complementary
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Criteria For Selection
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Criteria for selection
Criteria Jigs DMS
Particle size Narrower sizing Broader sizing
Density cut No restriction Max limit of 3.8
Density difference between float andsinks
> 1.0 0.5 to 0.8
Efficiency (partition curve) Less sharp Sharper
Efficiency (relative to particle size) Much less dependant Dependant on small size
Near density material(Influence onproductgrade)
Varying grade Achieve grade moreeffectively
Yield and recovery Less optimisation Better optimisation
Tailings grades Higher Lower
Separation Density Density
Capex Higher Lower
Opex Lower Higher
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Efficiency Comparison
0
10
20
30
40
50
60
70
80
90
100
F 2.7 2.85 - 3 3.15 - 3.3 3.45 - 3.6 3.75 - 3.9 4.05 - 4.2
Recov
ery(%)
Size Fraction (mm)
DMS & Jig Partition Curves
DMS
Jig (Interpolated)
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JIG SETUP
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Gravity Separation Performance
> Concentration Criterion =SG of heavy mineralSG of fluidSG of light mineralSG of fluid
Concentration Criterion (CC) Gravity Separation
CC>2.5 Easy down to 75 m
1.75
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Jigging Action
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Jig Variations
Fixed screen and moving screen (less common) variations
Different variations suit different feed stock
Variation Type (all fixed) Pulse Mechanism
Richards Water pulse
Harz Mechanical piston pulse
Russian MOBK Pneumatic piston pulse
Denver Diaphragm pulse
Bendelari Diaphragm pulse
Yuba Diaphragm pulse
Pan-American Moving hutchBaum (side pulse) Air pulse
Batac (under bed pulse) Air pulse Smartdogmining.com
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Under bed (Batac) pulsed machines
Examples
Alljig from Allmineral
Batac from Humboldt Wedag
Apic jigs from Bateman
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AlljigSide Pulsed
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MBE Batak Jigs
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DMS SETUP
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DMS Medium
Heavy Liquids
Response of a given feed to a DMS process and be accurately
established in a laboratory by testing with various heavy liquids
Name Specific Gravity, 25oC
Methylene iodide 3.33
Tetrabromoethane 2.96
Bromoform 2.86
Tribromoethane 2.61
Methylene bromide 2.48
Ethylene dibromide 2.17
Methylene chlorobromide 1.92
Pentachlorethane 1.67
Carbon tetrachloride 1.59
Trichloroethylene 1.46
Ethylene dichloride 1.26
Liquids Used to Test Feeds
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DMS Medium
Heavy Liquids
Aim is to separate the ore samples into a series of fractions according
to density
May be used to assess the efficiency of an existing dense mediumcircuit
Heavy liquids give off toxic fumes and must be used with properventilation
The use of pure liquids has not been found to be practicable on acommercial scale
Industrial processes employ finely ground solids suspended in water
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DMS Medium
FeSi SG: 6.7-6.9
Milled FeSi produced in different size ranges
30-95% 45m
Coarser, low viscosity grades achieve medium densities of up to 3.3
Atomised FeSi
More spherical particles
Medium is of lower viscosity
Used to achieve densities as high as 4
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Gravity DMS Drum Separator
Drum Separator
Side view
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Gravity DMS Drum Separator
Drum Separator
End view
Gravity DMS Drum Separator
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Gravity DMS Drum SeparatorSinks Launder
WEMCO Heavy Media Drum Separator
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C t if l DMS DSM C l
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Centrifugal DMS DSM Cyclone
Dutch State Mines (DSM)Cyclone Separator
Used for finer feeds, 0.04 to0.0005 m
Separation is made by the actionof centrifugal and centripetal
forces.
The heavier portion of the feedleaves the cyclone at the apexopening (5), and the lighterportion leaves at the overflow top
orifice
C t if l DMS DSM C l
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Centrifugal DMS DSM Cyclone
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T i l DMS Fl h t
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Typical DMS Flowsheet
DMS PFD
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DMS PFD
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Case Studies
DMS results: Operation A
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DMS results: Operation A
The operations product grades are > 65% Fe
Density cut point for achieving grade is considered to be 4.2 So, no chance
Description Weight (g) Weight (%) Fe (%)
+3.8sg 7.3 3.8 61.54
-3.8+3.6sg 28.6 15.0 57.11
-3.6+3.3sg 146.0 76.9 55.95
-3.3sg 4.0 2.1 52.19
Total (+1.18mm) 185.9 97.8 56.27
-1.18mm 4.1 2.2 46.47
Calculated Head 190.0 100.0 56.05
Head Assay 55.67
Jig results: Operation A
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Jig results: Operation A
Notice grade is achieved
Notice also the mass yield
Lump product Pilot plantresults for 11 test runs
Product(32-62mm) Weight (%) % Fe Grade Fe Recovery (%)
Feed Run 1 100 60.1 101.2
Conc. Run 1 85 65.4 92.5Reject Run 1 15 34.6 8.6
Feed Run 4 100 62.1 99.3
Conc Run 4 86.8 66.5 93
Reject Run 4 13.2 29.7 6.3
Feed Run 7 100 59.7 99.9
Conc. Run 7 85.4 65.3 93.4
Reject Run 14.6 26.4 6.5
Jigging Test Runs
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Costing
Capex and Opex
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Capex and Opex
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Capex and Opex
Capex
Opex
Direct Costs EquipmentInstalled
BulkEarthworks &Civils
Platework,Structural &Piping
Electrical &Instrumentation
Buildings DesignContingency
Freight TotalCosts
DMS $16,01M $3,13M $3,65M $2,55M $0.58M $2,59M $1.00M $27.0M
Jigs $16,71M $3,27M $3,81M $2,66M $0.61M $2,71M $1,04M $30.8M
Area Fixed Variable Misc. Total % Total
Labour Power Reagents &Consumables
Maintenance $/tonne Costs
DMS plant $0.56 $0.73 $4.41 $0.34 $0.04 $6.08 35.5%
Jig plant $0.56 $1.04 $0.75 $0.35 $0.00 $2.70 12.5%
References
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References
Mills, Chapter 18, Mineral Processing Plant Design Mular, BhappuEditors, SME, 1980
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