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Project : ALCAN GOVE BAUXITE OPERATIONS - REFINERY EXPANSION - STRUCTURAL/MECHANICAL

Mining - Primary And Secondary Processing
Minerals Processing
  Estimated Project Value
$ 150,000,000
Address Gove Peninsula North West Arnhem Land via
Suburb Gove
State NT
Council East Arnhem Shire
Postcode 0880
Project Type Structural/Mechanical
Development Type New
Status Firm
Stage Contract Let
Ownership Private
Notes
Contract Let Contractor Named Subcontracts To Be Let Progressively
Commence Date 3/5/2005
Completion Date 3/10/2006
Details
  • Refinery expansion will increase production from a current 2 Mt/y to 3.8Mt/y in 2007.
  • Proposed expansion includes stockpiling and handling.
  • Bauxite will not be exported from Gove anymore but will be directed to the refinery.
  • Stockpile sizes will remain the same, but stacker and feed conveyor systems will be upgraded or replaced and the refinery reclaimer will also be replaced.
  • Three new grinding mills will be installed to replace the old rod and ball mills.
  • One new mill slurry tank and pump transfer system together with one train of indirect mill slurry equipment will be installed.
  • The heated feed will now be processed in a new high temperature double digestion process.
  • A third low temperature digestion plant will be installed, as well as deep-cone thickners and high pressure pumps.
  • The mud and liquor residue will be seperated in pressure decanters and processed through a train of new high rate washers and a single train of five deep cone thickners.
  • The existing washers and thickners will be used for storage of residue liquids.
  • Some will be demolished.
  • Six new vertical pressure filters will be installed in a new security filtation area to process most of the turbid liquor flow from the thickners.
  • Agglomeration precipitators and growth precipitators will be added to increase capacity as well as two interstage cooling facilities will be installed on each growth precipitator train.
  • Flash vessels and a barometric condenser will be installed using cooling water from new cooling towers.
  • A new hydrocyclone classification system with three classification stages allowing three different sized hydrate streams to be produced will be installed.
  • A new filtration area and equipment will be installed to conduct filtration of various hydrate streams.
  • Equipment will include six drum filters, vacum pumps and air blowers.
  • Three new stationary calciners will be installed in conjunction with new hydrate conveyors and upgraded aluminia transfer systems.
  • A new evaporation plant will be installed as well as cooling towers for vapour removal in the last three flash stages.
  • Lime plant capacity will be increased from 140 t/h to 200 t/h by installing a new burner system and modifying the kiln's internal geometry.
  • A new burnt lime storage silo will be installed.
  • The existing power station will be converted from fuel oil to gas that will involve a new boiler and associated turbine units.
  • The neutralisation plant will include a mixing tank and two thickners in a bunded area.
  • New liquor purification plant will be constructed involving two seperate plants for the mixing and drying stage.
  • Thiess have been appointed as part of an alliance with Downer, Barclay Mowlem and Macmahon to construct the refinery expansion.
  • Thiess will be responsible for the structural and mechanical part of the expansion.
  • Thiess workforce at its peak will consist of 620 labour personnel and 60 staff onsite.
  • Associated Projects reported Mining report this Issue Construction Sections.
 
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