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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 14a
SUMMARY:Calix’ Zero Emissions Steel Technology (ZESTY) - Flash hydrogen direct reduction of low-grade ores to green iron and steel 
DESCRIPTION:Calix is extending the application of its indirectly heated Calix flash calcination (CFC) technology to the decarbonisation of iron and steel production. The Zero Emissions Steel TechnologY (ZESTY) can be used to process low- and high-grade iron ore fines to a hydrogen direct reduced iron (H-DRI) product, avoiding the need for pelletisation or agglomeration. The small particle size range of the iron ore charge facilitates fast rates of metallisation allowing for significantly shorter residence times (in the order of 60s) and lower temperature operation than a conventional blast furnace such that the stickiness problem is avoided. Pilot-scale testing at Calix’s Centre for Technology Development in Victoria, Australia has shown that the ZESTY technology can produce a H-DRI product approaching commercial grade. 
The ZESTY technology is compatible with intermittent operation and can therefore be heated using renewable energy sources. ZESTY is targeting the theoretical minimum hydrogen use of 54 kg/t H-DRI as green hydrogen is used only as the reductant and is recycled in the process.
Several scenarios are being explored for the downstream processing of the ZESTY DRI product including hot briquetting, direct flash melting and processing to green steel through integration with an electric arc furnace. Calix’s Low Emissions Intensity Lime and Cement (LEILAC) technology can be used to supply a zero-emissions lime fluxing agent to the EAF and other steel making processes.
This paper will introduce the technology and discuss the status of ZESTY pilot testing and development.

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