1887

Abstract

Summary

In the context of accelerating geological carbon storage, we present a bio-derived acetic-acid-ligand leaching strategy to enhance mineral carbonation of hematite-rich iron ore tailings. Batch experiments (pH 2, 75 °C) show that biomass-sourced acetic acid, amended with trace ethylenediaminetetraacetic acid (EDTA) or nitrilotriacetic acid (NTA), surmounts the inherently slow dissolution kinetics of FeO, releasing up to 70 % more Fe3⁺ than acetic acid alone. The liberated iron reacts readily with injected CO to precipitate siderite (FeCO), establishing a stable, solid-phase sink for carbon.

Stoichiometric balances indicate that dissolving 70 wt% % of one tonne of pure hematite could immobilize ∼350 kg CO at 90 % mineralization efficiency; tailings containing 40 wt% % hematite would still sequester ∼140 kg CO per tonne processed. By eliminating chloride and sulphate byproducts and employing renewable acetic acid, this route aligns with life-cycle decarbonization goals while offering a scalable, low-hazard alternative to strong inorganic acids.

The study establishes mechanistic and techno-economic benchmarks for coupling bio-acid leaching with carbon-injection operations and offers transferable insights for other metal-oxide systems relevant to CCUS.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.202521128
2025-10-27
2026-01-16

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/content/papers/10.3997/2214-4609.202521128
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Bio‑Derived Acetic Acid-Ligand Leaching of Hematite Tailings to Accelerate CO2 Mineralization
Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.202521128
/content/papers/10.3997/2214-4609.202521128
/content/papers/10.3997/2214-4609.202521128
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