Software change log

Change Log

2016-01-01: Server move

• Moved to an upgraded virtual server box with the latest PHP and MySQL implementation (using current stable Debian repository).

2015-11-17: Morrell SMC model

• Fixed a bug where Morrell SMC model gave an error message and zero throughput. (Also related to the 2015-11-08 fix to the Raw Bond model)

2015-11-11: Bond Single Stage SAG model

• Fixed a bug where Bond SSSAG model gave an error message and zero throughput. (The 2015-11-08 fix to the Raw Bond model broke the Bond SSSAG model)

2015-11-08: SGI model Epeb handling

• Fixed a bug where the pebble crusher specific energy consumption was not be included in the Amelunxen SGI model Etotal value

2015-10-05: Ball mill default cone angle

• Changed the default cone angle for ball mills to 15 degrees.

2015-10-05: Report changes

• Allow the user to define which percentiles should appear on a report. The 'PDF export' button now opens a small text field where a space-delimited list of percentiles may be entered. If this field is blank, then no "flowsheets" will appear in the report.
• Added some more information to mill & PDF output pages, such as the mechanical & electrical efficiency of drives.

2015-07-24: Synthetic Testwork results

• Added a new column to several testwork tables called 'synthetic'. If this column contains a value of '1' (boolean=true) for a test, then that test is understood to not be a real test result and is therefore not shown on the testwork comparison charts. It is available when running circuit model simulations and does show up in the list of model results.

• Fixed a bug where the motor torque for mills with qty>2 was showing the sum of the torque for all mills rather than the torque for a single mill.

2015-06-12: Test result summary

• A testwork summary listing now shows the Mia and Mib values needed for the Morrell SMC model. The DWI value was removed from the summary as it is not used directly in any of the models.

• Minor changes to the PDF report showing specific energy model names rather than their ID number.

2015-06-02: Tent Diagram

• A Tent diagram can now show just power, just torque, or overlay both.

2015-05-13: Drive torque

• Modified the tent diagram to show the process torque demand (at the mill shell) across the range of mill speed
• Added the torque (at the mill shell) to the list of properties in the mill detail listing.

2015-05-07: Tent diagram

• Modified range of tent diagram up to 85% of critical speed.
• Fixed bug where operating speed determined the torque of the tent diagram peak.

2015-04-25: Added Morrell SMC (Mia, Mib) SAB & SABC circuit model

• New specific energy model for SAG & ball mill circuits that uses Mia (from SMC™ test) and Mib (from a Bond Wi_BM) values.
• Must enter the following information for the Bond ball mill work index to permit Mib calculation in order to run this model:
  • Test P100 (closing screen) size, µm
  • Test P80 size, µm
  • Test F80 size, µm
  • Test grams per revolution (GPR)

2015-04-21: Added rod mill-ball mill circuit model

• New specific energy model using Bond/Rowland method for rod mills and ball mills.
• Fixed a problem with default values not appearing in drop-down select fields.
• Tweaked behaviour of SGI model under SAG-limited and ball-limited conditions.

2015-04-10: Added Amelunxen SGI model

• New specific energy model for SAG & ball mill circuits that uses SGI (or SPI™) values instead of Bond work index for rod mill and crushing.
• Mandatory to set the CFsag and CFball configuration factors, see the documentation.

Bug list

Known bugs that are scheduled for fixing:

• SGI model PDF output does not show the CFsag and CFball values [mostly cosmetic, low priority]
• The liner thickness for newly created mills reverts to the default liner thickness the second time the mill is edited.
• The Morrell SMC model in SAG-limited, fixed-speed BM situations gives a residual difference between Esag+Eball and Etotal. This is due to using Bond's equation do determine the new P80, rather than Morrell's. The difference is usually <0.1 kWh/t, but occasionally as high as 0.3 kWh/t