Improving Current Efficiency of Aged Reduction Lines at Aluminium Bahrain (Alba)

摘要

The side worked end-on-end pre-bake anode technologiesinstalled during 1970’s at Alba achieved a current efficiency of90%. During the early nineties, the potlines were retrofitted fromside break to point fed cell arrangement, along with an increase of7% and 10% in line current. The retrofits included anode gascollection system, a changed anode setting pattern, andinstallation of alumina and aluminium fluoride feeders controlledusing individual cell controller, which increased the currentefficiency to 92.5%. During the last 6 years, improvements donein the alumina feeding control, thermal control and stability of celloperations has increased the current efficiency to 94.5%. Closemonitoring and follow up of quality of work and key parameterson daily basis by the new employees forum introduced at Alba in2004 called SMART Centres (See My Actions Reflect Targets) hasalso contributed towards this improvement and maintaining it.