Building on experience

HAL250 was the technology applied in Hydro's project at Sunndal, Norway. The new development in Qatar can build on the experiences gained in Sunndal, at other Hydro plants, and in the course of the company’s technology development activities.

The cell technology is a top technology product. Aluminium production takes place at 960°C and uses aggressive chemicals. This process is difficult to monitor using normal measurement methods and equipment, so Hydro has therefore developed a special microcomputer for process control.

It is vital that aluminium cell control system functions without fault 24 hours a day, every day, year after year.

The HAL275 technology to be used in Qatalum is an economical and environmental-friendly electrolytic reduction technology. A holistic approach, system knowledge, operational experience and advanced mathematical models have resulted in a compact and highly productive plant with a sound working environment. Highly efficient purification units will be installed. Due to the temperatures involved, there will also be a high degree of mechanization of operation.

Improved working environment

Hydro's recent technology development has taken place at a time when ever greater consideration has been given to local communities and the environment. This challenge has helped Hydro develop one of the most environmentally friendly and compact electrolytic reduction technologies in the world.

The removal of process gases is an important factor for the protection of operators and for ensuring a clean working environment. The patented extraction system collects 99.5 percent of the gases from the process with optimal energy use. All fluoride is recycled.

Other important environmental features of HAL275 are:

• Increased extraction from cells during change of anodes 
• Closed transport systems for oxide and coke 
• New, highly efficient purification units