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Rio Tinto and Calix are collaborating on the Zesty green iron demonstration plant in Australia, aimed at producing up to 30,000 t/y of hydrogen direct reduced iron or hot-briquetted iron. The facility will use various iron-ore feedstocks and is designed to lower emissions in steelmaking.

Rio Tinto plans to invest over A$35 million, supplemented by a grant of up to A$44.9 million from the Australian Renewable Energy Agency. The project is currently in the detailed design phase with a final investment decision anticipated in 2026.