Focusing on metals like niobium and tantalum won’t have the massive climate benefit that cleaner steel would, but it could generate the cash the company needs to keep going. It’s a strategy I’m noticing more as these tough industries like steel look ever tougher to succeed in with limited federal support in the US.  

Boston Metal’s molten oxide electrolysis technology uses electricity to produce metals.

I covered the startup last year, when it announced a major milestone for its steel business, running its pilot reactor in Massachusetts and producing a literal ton of material.

Now the company’s focus has shifted, and it is going all-in on making other metals, from niobium and tantalum (used in aircraft engines and high-end steel alloys) to chromium and vanadium.

The steel industry is a difficult one: It operates at a massive scale, and the product doesn’t command too high a price. Focusing on other metals, especially ones the US government deems critical, could be a way to stay afloat, maybe even long enough to meaningfully cut emissions from the steel industry. 

“By deploying in the critical metals industry where we can go very fast, we generate the resources to continue with the development of steel,” says Tadeu Carneiro, CEO of Boston Metal.

Other companies are also hoping critical materials could help their business models.

California-based Brimstone has a new process to make cement—another heavily polluting industry that’s proving difficult to decarbonize. The company uses a new starting material to help cut down on carbon dioxide emissions. In addition to cement, it makes supplementary cementitious materials that can be added into concrete as well as smelter-grade alumina.