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

摘要

The side worked end-on-end pre-bake anode technologiesrninstalled during 1970’s at Alba achieved a current efficiency ofrn90%. During the early nineties, the potlines were retrofitted fromrnside break to point fed cell arrangement, along with an increase ofrn7% and 10% in line current. The retrofits included anode gasrncollection system, a changed anode setting pattern, andrninstallation of alumina and aluminium fluoride feeders controlledrnusing individual cell controller, which increased the currentrnefficiency to 92.5%. During the last 6 years, improvements donernin the alumina feeding control, thermal control and stability of cellrnoperations has increased the current efficiency to 94.5%. Closernmonitoring and follow up of quality of work and key parametersrnon daily basis by the new employees forum introduced at Alba inrn2004 called SMART Centres (See My Actions Reflect Targets) hasrnalso contributed towards this improvement and maintaining it.