Evolving metal extraction processes
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…
The metals industry has undergone significant changes throughout history, with new extraction processes revolutionizing the field. However, for over a century, metal extraction processes have largely relied on traditional techniques, with little advancement in the fundamental science behind separating metals from ores. Today's materials challenges are different from those of the past, yet the scientific foundations for producing critical metals remain largely unchanged.
EvoMaterials, a technology platform from Outokumpu, aims to address this issue by rethinking metal extraction processes. Outokumpu, a leader in sustainable stainless steel and ferrochrome production, developed EvoMaterials to explore more efficient and sustainable metal extraction methods. Caspar Stinn, technical director for extractive metallurgy at Outokumpu, explains that the company is seeking to reimagine metals production by looking beyond current constraints and applying advanced scientific engineering knowledge.
The metals industry faces growing demand due to expanding economies and increased electrification, driven by various technologies and applications. Antoine Allanore, a professor of metallurgy at MIT, notes that this rising demand coincides with many Western countries reducing their domestic processing capacity for critical metals.
Metallurgy is now crucially important, considering factors such as cost, availability, carbon footprint, and supply-chain resilience. Chromium and other specialty metals play a vital role in various high-temperature and extreme environments, including aerospace, power generation, corrosion-resistant infrastructure, and defense technologies.
For decades, metallurgical innovation focused on improving yields, energy efficiency, and process control. However, EvoMaterials proposes a new approach by exploring alternative chemical pathways in metallurgy. Laboratory trials showed that these alternative process chemistries could not only lower emissions but also recover valuable metals from lower-grade resources and industrial side streams while fundamentally altering separation processes.
The technology, based on sulfidation-based processing, was initially developed to reduce carbon emissions in ferrochrome production. Outokumpu has since evolved the technology through extensive research and development in collaboration with MIT, leveraging advanced simulation tools and interdisciplinary expertise. EvoMaterials represents a technology platform that can be applied to multiple metal systems, enabling broader applications beyond its initial use case.
The innovative approach has the potential to significantly improve resource efficiency and industrial competitiveness by extracting greater value from mineral resources, even those previously considered waste.
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