AluminiumCarbonFootprintTechnicalSupportDocumentv1.0FINAL:15thFebruary2018ThisguidanceispreparedbyInternationalAluminiumInstituteonbehalfofitsmembercompanies.AluminiumCarbonFootprintTechnicalSupportDocumentv1.0(15thFebruary2018)2Contents1Introduction....................................................................................................................................32Normativereferences..................................................................................................................33Termsanddefinitions..................................................................................................................44Methodologyforcarbonfootprintqualification.........................................................................54.1Goalandscope.....................................................................................................................54.2SourcesofGHG...................................................................................................................54.3Lifecycleimpactassessment.............................................................................................64.3.1Calculationofdirectemissionsfromunitprocessesandfuelcombustion..........64.3.1.1Bauxitemining......................................................................................................64.3.1.2Aluminarefining....................................................................................................64.3.1.3Aluminiumelectrolysis.........................................................................................64.3.1.4Anodeproduction.................................................................................................64.3.1.5Aluminiumingotcasting......................................................................................64.3.2Calculationofemissionsfromelectricity&heatproduction..................................74.3.2.1Purchasedelectricity&heat...............................................................................74.3.2.2Self-generatedelectricity&heat........................................................................74.3.3Calculationofotheremissions...................................................................................94.4Modellingparametersandassumptions,allocationissues.........................................104.4.1General........................................................................................................................104.4.2Allocationprocedure..................................................................................................104.4.2.1Ingotcasting........................................................................................................104.4.2.2Aluminaproduction............................................................................................104.4.2.3Reuseandrecycling..........................................................................................114.5Levelofdisclosure.............................................................................................................114.6Communicationofcarbonfootprintresult.......................................................................124.7Bibliography...................................................................................................