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Concentrated solar thermal 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 concentrated solar thermal as heat input into alumina refining.

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. Concentrated solar thermal potentially has lower applicability compared to alternatives.

Key Countries

Australia, Saudi Arabia

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