A NOVEL METHOD FOR PROCESSING SODIUM REDUCTION SKIMMING STATION RESIDUE

摘要

The aluminium industry often faces financially conflictingrnchallenges where costs are under increasing pressure butrnmore stringent environmental constraints and customerrnspecifications are imposed. Increasingly, smelters arernresorting to treatment of aluminium in cruciblerntechnologies to reduce alkali and in particular sodiumrncontent in the hot metal prior to delivery to the casthouse.rnThe consequence of this process is a residue or skimmingrnwaste that can be costly to process and/or dispose of andrntypically involves some form of landfill. This paperrndescribes how, faced with a large and growing stockpile ofrnskimming waste, Emirates Aluminium (EMAL, also knownrnas EGA Al Taweelah) used the existing plant to processrn100 % of the skimming waste on site with no additionalrnoff-site disposal or treatment.