About ZESTY
Calix’s Zero Emissions Steel TechnologY (ZESTY) is designed to help decarbonise one of the world’s most carbon-intensive industrial processes – iron and steel production. The industry accounts for ~7-9% of global CO2 emissions, with the majority resulting from the use of metallurgical coal in the reduction of iron ore to metallic iron.[1]
ZESTY enables direct hydrogen reduction of iron ore (H-DRI) in a renewably powered reactor to produce green iron and ultimately, green steel. It provides the potential for a zero-carbon route to iron and steel that in turn can help add value to local iron ore exports, future-proof local iron and steel production and support sustainable global development.
ZESTY’s indirect heating approach is well suited for electrification, including with renewable and intermittent energy sources. Electrification also means no combustion. With ZESTY, hydrogen is consumed only as a reductant, not as a fuel, and can be simply recycled in the process. This key feature enables ZESTY to target the most efficient and economical use possible of hydrogen.
Process flow diagram for ZESTY green steel production.
