The encyclopedia · Engineering & Operations · Technical decision · 1995–2014
POSCO's FINEX made steel from raw fine ore and coal, skipping coke ovens and sinter plants
Fluidized-bed ironmaking took fine ore and coal straight to molten iron, cutting investment, cost and pollution.
POSCO
the move
Steel's classic route is a blast furnace fed by two expensive prep plants: sintering turns fine ore into lumps, coking bakes coal into coke. POSCO's FINEX process instead charges fine ore and soft coal directly into a fluidized bed, where reduction happens without agglomeration — deleting the sinter plant and coke oven entirely.
Per the Korean Economic Daily's dictionary entry, eliminating those plants cut investment and costs, improved economics by about 35% and produced almost no pollutants. POSCO completed the world's first commercial FINEX facility (1.5 million tonnes a year) in May 2007, after a pilot since 1995, and a third, 2-million-tonne plant in 2014.
FINEX worked but had limits: its modules were smaller than giant blast furnaces, so scale economies lagged, and its coal-based route still emitted carbon. As ESG pressure grew and steel demand softened, POSCO decided in 2025 to close the second FINEX plant and pour resources into HyREX, a hydrogen-reduction process built on FINEX's fluidized-bed technology.
why it works
- Deleting two whole process stages beats optimizing them.
- Fine ore and soft coal are cheaper than processed inputs.
- World-first commercialization made POSCO the technology reference.
- The know-how later became the base for hydrogen steelmaking.
what transfers
Process invention can leapfrog an industry standard by deleting whole stages instead of making each stage slightly better — and the inventor gets a cost and reputation lead others must buy or copy.
what came after
POSCO ran FINEX commercially for nearly two decades, then announced in 2025 it would close the 19-year-old second plant as a survival move amid a steel downturn and safety issues, focusing on HyREX hydrogen reduction with a demo plant targeted by 2027 — acknowledging FINEX as a transitional technology while keeping its core innovation.
references
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