Electrochemical Arsenic Immobilization for Sustainable Cobalt Production

Tender summary

<p><strong>Technology Summary</strong></p> <p>This technology introduces an electrochemical method for extracting cobalt from sulfoarsenide minerals, such as cobaltite (CoAsS), while simultaneously immobilizing arsenic as scorodite (FeAsO₄&middot;2H₂O), a stable and low-solubility mineral form. The process enables cobalt production from arsenic-rich domestic sources by addressing both metal recovery and arsenic stabilization in a single system. The method operates at moderate temperatures (up to 70&deg;C) and under ambient pressure conditions, without the need for chemical oxidants or high-pressure equipment.</p> <p><strong>Challenge</strong></p> <p>Domestic sources of cobalt remain largely untapped due to the presence of arsenic, which complicates extraction and disposal. Existing approaches to arsenic immobilization are energy-intensive, require high-pressure systems, and often depend on hazardous oxidants such as hydrogen peroxide. These limitations present cost, safety, and environmental challenges to scaling up cobalt production from arsenide-rich ores.</p> <p><strong>Solution</strong></p> <p>The system consists of a two-compartment electrochemical cell separated by an anion exchange or bipolar membrane. In the anode compartment, a sulfuric acid electrolyte (pH &lt; 1) contains sulfoarsenide minerals and ferrous sulfate (FeSO₄). The electrochemical process proceeds as follows:</p> <ul> <li>Fe(II) is oxidized to Fe(III) at the anode via applied current.</li> <li>Fe(III) reacts with the mineral (e.g., CoAsS), releasing cobalt and dissolving arsenic.</li> <li>As(III) is oxidized to As(V) chemically or electrochemically.</li> <li>Fe(III) and As(V) combine to form scorodite, which precipitates from solution.</li> </ul> <p>This process allows for the selective extraction of cobalt while co-precipitating arsenic in a stable, low-mobility form.</p> <p><strong>Key Advantages</strong></p> <ul> <li>Integrated Processing: Combines metal extraction and arsenic immobilization in one step.</li> <li>Lower Input Requirements: Operates without external oxidants (e.g., H₂O₂) and under ambient pressure.</li> <li>Improved Environmental Management: Produces scorodite, which meets criteria for long-term arsenic stabilization.</li> <li>Reduced Energy Consumption: Eliminates the need for autoclaves and high-temperature hydrothermal systems.</li> <li>Scalable Design: Suitable for modular deployment and integration into hydrometallurgical workflows.</li> <li>Co-Recovery Potential: Supports extraction of additional metals, including Cu, Ag, Au, and rare earth elements.</li> </ul> <p></p> <p><strong>Market Applications</strong></p> <p>This technology is relevant to several critical sectors that rely on secure and sustainable supply chains for cobalt and other metals:</p> <ul> <li>Cobalt and Critical Mineral Processing: Enables extraction from previously uneconomical arsenic-rich deposits.</li> <li>Battery Supply Chain: Supports domestic sourcing of cobalt for lithium-ion batteries in EVs and grid storage.</li> <li>Mining Operations: Applicable to mineral processors working with polymetallic ores in the Idaho Cobalt Belt and other arsenide-rich regions.</li> <li>Environmental Remediation: Potential applications in the treatment of arsenic-bearing waste from legacy mining sites.</li> <li>Defense and Energy Security: Supports national strategies for critical material independence and supply chain resilience.</li> </ul> <p><strong>Licensing</strong></p> <p>INL&rsquo;s Technology Deployment department focuses solely on licensing intellectual property and collaborating with industry partners who can commercialize our innovations.</p> <p><strong>We <u>do not</u> engage in purchasing, procurement, or hiring external services for technology development.</strong> Our objective is to connect with companies interested in licensing and bringing our technologies to market.</p>

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• Located in United States.
• Deadline listed as 9 Jul 2026.
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