Vedanta Aluminium Ltd. had recently set up a Greenfield Alumina Refinery of capacity 1.4 MTPA at Lanjigarh in Orissa. The plant has already been commissioned.

Vedanta is now going for a major expansion to increase the capacity from 1.4 MTPA to 5.0 MTPA. HDO had done work for the Greenfield project and obtained preferred vendor status on completion of the project.

For this expansion project HDO was awarded the EPC for three packages:

• 3 MTPA Settler-Washer package: Being one of the most important packages of any alumina refinery HDO used the latest technology of hi-rate thickeners for mud settling and washing circuits. It comprises of 20 deep cone tanks of 20 meter diameter each.
• 30 TPH Milk of Lime package: HDO used its tried and tested in-house technology and proprietary equipment for this plant.
• 3 x 300 TPH Evaporation package: This comprises of six-stage falling film evaporator, three-stage flash evaporator in counter current process.

Accomplishments:

• Received Letter of Appreciation from Vedanta for HDOs progress of work, quality and achieving:
  
  • Highest level of erection in a single day (185.2 Mt) for settler-washer package
  • Erection of five Calendrias; refinery’s biggest single equipment for the evaporation package
• Project progress proceeding as per the planning schedules
• This is HDO’s biggest project for any alumina refinery