The presentation will address key opportunities to decarbonise the high temperature calcination process within alumina manufacture which, in turn, is one of the most challenging processes to decarbonise in the production of aluminium. Flash calcination reactors presently heat a fine powder in suspension to temperatures of approximately 1000°C by the combustion of fossil fuels, such as natural gas. They are difficult to electrify because the presence of fine particles leads to the high risk of damage to electrical heaters, while the temperatures are higher than what can be achieved with commercially-available solar thermal technology and green hydrogen is presently too expensive to be viable. New options have been identified in a large research program undertaken in partnership with industry. These findings will be presented in the seminar.