Fig. 2: Key mitigation technologies for aluminium smelters.
From: Different technology packages for aluminium smelters worldwide to deliver the 1.5 °C target
The shades of yellow represent the technology readiness level. The horizontal and vertical axes list the same set of technologies. Compatibility among technologies is indicated by colour: light green denotes compatibility, light pink denotes incompatibility, light blue indicates that the technologies can be used independently but are recommended to be combined for greater emissions reduction and dark blue indicates that the technology on the vertical axis is a prerequisite for the one on the horizontal axis. The numbers in the white areas represent the energy-saving potential of a retrofit technology, the energy intensity of new cell designs (in kWh kg−1 Al) or the emissions reduction potential (in %) of a specific technology. aDepend on the source of waste heat. bProcess-related emission reduction. cReduce cell smelting energy intensity to this value. dDepend on the specific situation of captive power plants and local power grid.
