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Hydrogen in the Bayer process

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Technology Description

The Bayer process - the main method to refine bauxite into alumina (the input to aluminium smelting) - requires 100 to 250 °C heat and steam for digestion and 1000 °C heat for calcination, which are currently delivered using fossil fuels. Testing is underway to use hydrogen for both digestion heat in boilers/co-generation and for calcination.

Relevance for Net Zero

Alternative fuels provide a good prospect for reducing alumina refining emissions. Alumina refining is a key source of the sector's emissions, so it will be important to develop technologies to reduce them in moving towards net zero emissions.

Key Countries

Australia

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