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Grinding Circuit Modelling Documentation

This documentation describes the operating and underlying mathematics of the SAGMILLING.COM grinding circuit modelling program. It is intended to be used by the model users who want to operate and understand the functioning of grinding models.

Specific Energy Models

• Theory of power models
• All Model types: specific energy consumption models
• SAG and ball mill circuit models
  • Raw Bond/Barratt SAB & SABC model
  • Optimized Bond/Barratt Models (including phantom cyclone allowance)
    • Optimized Bond/Barratt model SABC (pebble crushing)
    • Optimized Bond/Barratt model SAB (pebble recycle)
  • Amelunxen SAG Grindability Index (SGI) SAB and SABC model (similar to SPI™)
  • Morrell SMC SAG & ball mill model
• Single-stage SAG milling models
  • Bond/Barratt Single stage SAG milling model
  • Morrell Mi (SMC) Single stage SAG milling model
  • El Soldado (SGI) Single stage SAG milling model
• Rod mill and ball mill circuit models
  • Bond/Rowland rod mill & ball mill model
• Multi-stage crushing and ball milling models
  • Bond/Rowland Single stage ball milling
  • HPGR and ball mill model (using Bond) warning, experimental!
  • HPGR and ball mill model (using Morrell)

Mill power draw models

• Measurement of power (motor input versus shell, etc.)
• Media density for rods and balls
• Model types: mill power draw
  • Austin SAG model (hybrid phenomenological and empirical model)
  • Morrell C-model for SAG & ball mills (phenomenological model with empirical fitting). Sub-divided into:
    • a simplified model with 'typical' defaults and
    • a full model with all parameters editable.
  • Loveday/Barratt SAG model (uses an internal table of empirical "Power Numbers")
  • Nordberg ball mill model (largely empirical model)
  • Nordberg rod mill model (largely empirical model)
  • Crusher model (power allowance)

Laboratory testwork

• Testwork and test types
  • Conversions between test types
  • Ball mill work index adjustment parameters
• Particle size does matter
• Planning a test program for a project that does not have any testing performed yet

Operating the Model

• General concepts
  • Detailed concepts - Aggregating sample testwork
  • Detailed concepts - Intellectual Property
• Entering test results
  • Testwork Program
  • How to declare new Sample Names
• Creating a circuit model
  • Modelling: Transfer size limits
• Creating/modifying a mill
• How to show a sub-set of results
• How to copy data out of a table and into a spreadsheet
• How to design a new circuit using grindability testing

Administrator functions

• General administration concepts
• About user IDs
• Add a user
• Add a project
• Assign users to a project

Benchmarking

Examples of how the SAGMILLING.COM model compare to published information for actual milling circuits.

• Category:Benchmarking
  • Specific Energy Consumption Models
  • SAG Mill Power Draw Models, use the IMPC 2016 paper
  • Ball Mill Power Draw Models

Bibliography

• Bibliography: Specific energy consumption models
• Bibliography: Mill power draw models
• Bibliography: Testwork programs

Index

Special:Categories

Software change log

• Known Bug list