Rio Tinto to reduce carbon emissions in alumina refining

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Rio Tinto has partnered with Australian Renewable Energy Agency (Arena) to reduce carbon emissions in alumina refining.

The aim of the cooperation is to study whether hydrogen can replace natural gas to reduce carbon emissions in the calcination process of refining at the Yarwun alumina refinery in Gladstone. For this purpose Rio Tinto will conduct a $1.2m feasibility study, equally funded with Arena through a $580,000 grant. The study programme includes work to be done at Rio Tinto’s Bundoora Technical Development Centre in Melbourne, where Rio Tinto’s in-house development capability has now been extended to hydrogen.

Reducing carbon emissions in alumina refining “a crucial step towards producing green aluminium”

Arena CEO Darren Miller said: “If we can replace fossil fuels with clean hydrogen in the refining process for alumina, this will reduce emissions in the energy and emissions intensive refining stage of the aluminium supply chain. Exploring these new clean energy technologies and methods is a crucial step towards producing green aluminium.”

He continued: “This study will investigate a potential technology that can contribute to the decarbonisation of the Australian alumina industry. If successful, the technical and commercial lessons from Rio Tinto’s study could lead to the implementation of hydrogen calcination technology, not only in Australia, but also internationally.”

Rio Tinto Aluminium Pacific Operations acting managing director Daniel van der Westhuizen said: “We see the Arena and Rio Tinto-funded study as a step towards reducing refinery emissions and one that has the potential to play an important part in Rio Tinto’s commitment to decarbonisation. “We’re investing in work that needs to be done, not only to decarbonise one of our sites, but also to help provide a lower-emissions pathway for Rio Tinto and the global aluminium industry.

Rio Tinto aims to reach net zero emissions by 2050

The study comprises two distinct work packages:

  • Preliminary engineering and design study conducted to understand the construction and operational requirements of a potential demonstration project at the Yarwun alumina refinery.
  • Simulating the calcination process using a lab scale reactor at the Bundoora Technical Development Centre.

Once complete, the study will inform the viability of a potential demonstration project. Rio Tinto has lodged patents for the hydrogen calcination process.

Rio Tinto is aiming to reach net zero emissions across its operations by 2050. Across the company, it is targeting a 15 % reduction in absolute emissions and a 30 % reduction in emissions intensity by 2030, from a 2018 baseline.

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