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Grinding process test plant capabilities

Metso's Engineering offers specialized test plant capabilities to the mining industry for use in equipment sizing and/or process determination.

Our test plant capabilities include:

Bench scale tests

  • Screen analysis of “as received” materials:
  • Tyler Standard Series—DRY
  • Tyler Standard Series—WET/DRY
  • Specific Gravity
  • Percent Moisture determination
  • Blaine Specific Surface determination
  • Bulk Density (loose or packed)
  • Angle of Repose (static or dynamic) estimate
  • Malvern Mastersizer Particle Size Analyzer test (near one micron sizing)
  • Blending components for test
  • Precrushing samples

Bond work index tests
  • Standardized Tests
  • Ball or Rod Mill

Hardgrove grindability index tests
  • Standardized Tests

Wet or dry jar ball mill tests
  • Equipment—8”x 10” Jar Mill (tumbling grinding mill)
  • Calculations for indicated energy requir ements typically tendered in HP/Ton
  • Calculations to arrive at an operating work index for commercial size plants
  • Preliminary order of magnitude recommendations of equipment sizing based upon customer application specifications
  • Ceramic Jar Mill, with ceramic media for limiting steel contamination

Wet or dry jar rod mill tests
  • Equipment—8” x 10” Rod Mill
  • Calculations for indicated energy requirements typically tendered in HP/Ton
  • Calculations to arrive at an operating work index for commercial size plants
  • Recommendations for commercial size rod mills based upon customer application specifications.

Continuous ball mill tests (pilot plant size)
  • Mills available:
  • 2’ x 8” Hardinge Conical Ball Mill
  • 19” x 35” Cylindrical Ball Mill
  • 2’ x 4’ Cylindrical Ball Mill
  • Can be operated in open or closed circuit
  • Can be operated in wet or dry mode
  • Air classifiers available for use in closed circuit dry mode

Continuous pebble mill tests
  • Mills available:
  • 2’ x 8” Hardinge Conical Pebble Mill
  • 19” x 35” Cylindrical Pebble Mill
  • 2’ x 4’ Cylindrical Pebble Mill
  • Can be operated in open or closed circuit
  • Can be operated in wet or dry mode
  • Air classifiers available for use in closed circuit dry mode.

Continuous rod mill tests
  • Mills available:
  • 19” x 35” Cylindrical Rod Mill
  • 2’ x 4’ Cylindrical Rod Mill
  • Can be operated in open or closed circuit
  • Can be operated in wet or dry mode
  • Air classifiers available for use in closed circuit dry mode

Batch cascade mill tests

Autogenous or Semi-Autogenous
  • Equipment -6' x 1' Hardinge Batch Cascade Mill
  • Batch mode of operation with various percentages of grinding media
  • Scale-up, with approximate 20% scale-up factor required for SAG tests only
  • Energy indications for autogenous test work




Continuous autogenous or semi-autogenous grinding tests
  • Equipment—6' x 2' Hardinge Cascade Mill
  • Requires 25-100 tons of minus 10" material
  • Either customer or Svedala must separate feed into three size fractions
  • Feed rate to mill is from 500 to 6000 lb./hr.
  • Continuous operation in open or closed circuit is available
  • Continuous operation in closed circuit with vibrating screen, rake classifier, or trommel screen is available
  • Continuous operation in closed circuit with a jaw crusher for ABC test work is available
  • Continuous operation in wet or dry mode
  • Various ball charges are typically tested
  • Development of commercial size scale-up recommendations based upon customer application specifications

VERTIMILLTM tests
  • Equipment—VTM-3 VERTIMILLTM
  • Open circuit operation utilizing top feed — bottom discharge
  • Open circuit operation utilizing top feed — top discharge – recycle loop
  • Closed circuit operation utilizing top feed — cyclone discharge
  • Closed circuit operation utilizing top feed — settling classifier (VTM-3)
  • Operation demonstrating lime slaking
  • Open or closed circuit operation utilizing sump feed, integral classifier feed

Air classifier tests
  • Equipment available:
  • 12” Hardinge G.A.C. System
  • 18” Hardinge G.A.C. System
  • DS2 DELTA SIZER System
  • A stand alone G.A.C. can be made to classify approximately 99% minus 325 mesh, or as coarse as 80% minus 100 mesh, dependent upon materials, rotation speed, air stream velocity, etc.
  • A stand alone DELTA SIZER System can be made to classify to minus 10 micron
  • Typically, test is performed in conjunction with a dry grinding ball mill circuit





Vibrating ball mill tests
  • 1515D Vibrating Ball Mill
  • Can be operated in open or closed circuit

Miscellaneous tests
  • Vacuum Filtration, small scale
  • Screening, large size
  • Jaw Crushing, material preparation
  • Miscellaneous lab equipment for physical testing of samples
  • Abrasion index test

Additional equipment
  • Density Gauge
  • Flowmeters
  • Hydrocyclones
  • Closed circuit pumping
  • Rotex Screens
  • Rotary Dryer
  • Stirred Mill Detritor (SMD)
  • Svedala Agitated Mill (SAM)
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