Fast Metals is treating waste with more waste to extract critical minerals | TechCrunch0

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• July 29, 2026

Aluminum has left an indelible mark on the world: more than 3 billion tons of red sludge, a waste product of the refining process, are currently stored in open-air ponds or mounds. But for Sumedh Gostu, co-founder and CEO of Fast Metals, there is a treasure in caustic waste. “It’s a very rich resource,” he