Steel factories emit around 3 billion tons of CO2 a year. A new way of producing it eliminates direct CO2 emissions and cuts energy use in half.
When he cofounded the startup Helios four years ago, Jonathan Geifman was focused on space travel, not climate change. But as his team worked on one challenge—how to produce oxygen on the moon—they stumbled on a new solution for one of the biggest climate polluters on the planet: the steel industry.
Right now, steel factories emit around 3 billion tons of CO2 a year, or around three times as much as the entire airline industry. The emissions aren’t just from energy use, but from the process: The first step typically involves combining a form of coal with iron ore in a giant furnace, and as it burns, the chemical reaction makes CO2. While the industry is experimenting with alternatives, including using green hydrogen and carbon capture, they’re expensive and likely to grow slowly. Helios’ approach could cost less than the status quo.“If you actually want to incentivize the industry to reduce its emissions—and not to do it by 2050, but to do it in the coming 10 years—in our opinion, the only way to do it is by coming up with a solution that will reduce their opex, their production costs,” says Geifman. “We completely disregard carbon credits on purpose: We want to show that this process is more efficient at its core. We don’t want to rely on subsidies or taxes in order to make this technology work.” As the new process eliminates direct CO2 emissions, it also cuts energy use in half, helping steel producers save money.
The Israel-based company discovered the new method while developing an approach to generate oxygen from regolith, the rocky covering on the moon. (One of the challenges for moon landings is the expense of transporting oxygen from Earth, for use both by astronauts and in rocket propellant.) On Earth, the simplest way to separate oxygen from iron oxide is to use carbon (and create pollution), but there’s little carbon on the moon. The team “needed to throw everything out and come up with a completely new concept,” Geifman says.
For proprietary reasons, the startup declined to describe the details of the chemical process that happens in its new reactor. But the basic approach is simple, and substitutes another material for carbon. As they began testing it to produce oxygen, they realized that they were also producing a lot of iron. “We got 10 times more than we’d calculated,” he says. “That was repeated time after time. We realized that we had an additional process that is going on inside the reactor beyond just our process. . . . I think we disassembled and reassembled the furnace 20 times to try and understand what was going on.”
The process can happen inside a direct reduction iron (DRI) furnace, a type of equipment that many steelmakers already have. It eliminates direct emissions, and because it also uses half the energy of the typical process, it also significantly cuts emissions from fossil energy used in the equipment. If the equipment is converted to use clean energy, emissions can drop to zero.
Read the full article at Fast Company.