Evolving metal extraction processes

Rethinking how metals are extracted could unlock lower-emission production, make better use of mineral resources, and strengthen critical-material supply chains. The metals industry has experienced transformational moments before: the Bessemer process, flash smelting, electric arc furnaces, and modern continuous casting all changed what was possible. Yet, for more than a century, most extraction processes rely on techniques and pathways that would be familiar to metallurgists from generations ago. Processes have become larger and control systems smarter, but the fundamental science behind separating metals from ores has changed less than many realize. Today's materials challenges are different from those of the 20th century, but why are critical metals still produced using largely the same scientific foundations? "We decided to go beyond the current constraints and look fundamentally at what's the best way to do this with the benefit of the scientific engineering knowledge and hindsight that we have today," says Caspar Stinn, technical director for extractive metallurgy at Outokumpu.