Helix Carbon bets iron decarbonization means cleaning blast furnaces, not replacing them

Helix Carbon is developing electrolyzers that convert raw blast-furnace CO2 exhaust into carbon monoxide for reuse in ironmaking, with specialty chemicals as an earlier revenue path.

That retrofitting existing blast furnaces — recycling their CO2 exhaust into carbon monoxide on site — beats replacing them, cutting emissions and saving $14 per ton.

Co-founder and CEO David Brown's diagnosis, as he told TechCrunch: 'Any attempt to decarbonize the steel industry without dealing with the blast furnace is not going to work.' Blast furnaces have made iron for centuries, burning coke to produce the carbon monoxide that strips oxygen from iron ore, and venting the CO2.

Helix's electrolyzer uses electricity and a catalyst to split an oxygen atom off CO2 and recycle the carbon monoxide into the furnace, letting producers burn less coke. Injecting the CO could displace 30–40% of coke per some studies, up to 90% per others; Helix proposes starting at 33%, which it says saves iron makers $14 per ton. To earn revenue earlier, it plans to court specialty chemicals first — making chemicals on site straight from waste streams, with no capture step.

Replacing blast furnaces is a century-scale capital cycle; retrofitting them meets the industry where its equipment actually is.

Handling raw exhaust without pre-processing removes the capture-and-purify step that makes most CO2-to-product economics fall apart.

The pitch pairs emissions cuts with a cost saving — $14 per ton at 33% coke replacement — in an industry famous for thin margins.

Selling CO2 utilization into specialty chemicals first generates revenue years before iron producers commit to a furnace retrofit.

Where equipment outlives companies — blast furnaces run a century — the retrofit that keeps the asset running beats the replacement that asks for a new one.

As of October 13, 2026, Helix Carbon had just presented live in TechCrunch's Startup Battlefield competition in San Francisco; the profile describes the coke-displacement figures as debated and the $14-per-ton saving as the company's own estimate for a 33% starting replacement. No funding, customers, or pilot installations are disclosed in the coverage.