Fast Metals secures $4.3 million to mine critical minerals from aluminum waste
Startup Fast Metals has raised $4.3 million to commercialize a process that extracts valuable rare-earth elements and titanium from the billions of tons of caustic red mud left over from aluminum production.
Fast Metals has secured $4.3 million in pre-seed funding to scale a technology that extracts critical minerals from red mud, the highly alkaline waste produced during aluminum refining. The round was led by New Climate Ventures and included backing from Azolla Ventures, Astor Swiss, and Founders Factory, the accelerator for mining giant Rio Tinto.
Global aluminum production has generated more than 3 billion tons of this vermillion-colored byproduct, which is currently stockpiled in outdoor storage ponds. While the material is largely composed of iron oxide, it also contains valuable deposits of titanium, aluminum, and rare-earth elements.
Historically, the industry has ignored these mineral riches because separating them from the iron oxide was prohibitively expensive. Sumedh Gostu, who co-founded Fast Metals and serves as its chief executive, believes his team has solved this economic barrier. "We are removing that impediment," Gostu said.
The company's approach involves applying a secondary waste stream from alumina refineries, alongside other chemicals, to the red mud across a six-step process. This allows different minerals to precipitate out sequentially for commercial sale. Gostu noted that the breakthrough came when he and co-founder Anthony Staley realized they could use another industrial byproduct to drive the economics.
"We were like, ‘oh wait, there’s a waste stream which can make the whole process very economical, and it’s lying right there,’" Gostu explained. The financial model relies on bulk commodities to subsidize the extraction of high-value materials. "Iron pays for the OpEx, and the other stuff is profit," he said.
Securing domestic sources of these materials is a major priority for industrial economies looking to stabilize supply chains for advanced manufacturing. The price differentials highlight the potential margins of this extraction model. Titanium dioxide trades at roughly $2.50 to $3 per kilogram, while scandium oxide commands approximately $750 per kilogram.
Fast Metals is now moving from the laboratory to commercial deployment. The startup has signed a contract with mineral processor Metalox to process one ton of the material weekly later this year.
