The TiWest plant, owned and operated by Tronox, is about 30 kilometers south of Perth in the industrial hub of Kwinana, Western Australia. The Kwinana plant uses Tronox’s proprietary chloride process technology to produce pigment used by manufacturers of paint, coatings, and plastics.

Tronox required an expansion to the existing plant to meet an increasing market demand for its product. The expansion enabled the plant, which is capable of transforming black ilmenite sand into white titanium dioxide pigment, to increase its capacity from 95,000 to 150,000 tonnes per annum.

Tetra Tech Proteus was chosen to undertake the engineering, procurement, and contract management (EPCM) for the expansion because of its recognized expertise in the study, design, and execution of industrial projects. 

The EPCM scope included the whole of the plant expansion, with specific areas as follows:

  • Water heaters
  • Bagging
  • Titanium tetrachloride (TiCl4) supply to oxidation
  • Demisting recycle gas
  • Sand mills and cyclones
  • Lime slaking
  • Cooling towers
  • Chilled water

To improve plant efficiency, the tunnel driers were replaced with swirled fluidized bed driers.

Tetra Tech Proteus was responsible for advancing the project from pre-feasibility and feasibility (PFS/FS) through to front-end engineering design (FEED), detailed design and engineering, procurement, and construction management.


The project was successfully commissioned to achieve the nameplate capacity within a tight commissioning schedule.