Low-Temperature CO2-Enhanced Reductive Bioleaching for Selective Nickel Recovery from Iron-Rich Silicate Tailings, with Concurrent Carbon Sequestration
低温CO2強化還元バイオリーチングによる鉄含有ケイ酸塩尾鉱からの選択的ニッケル回収と炭素隔離の同時達成 (AI 翻訳)
Kwabena Boafo, Palas Kamlakar Borkar, Atharva Rane, Timothy Eisele
🤖 gxceed AI 要約
日本語
鉄含有鉱山尾鉱からのニッケル回収は鉄の共溶出が課題だが、0℃・CO2富化雰囲気下でバイオリーチングを行うことで、Fe/Ni比を25℃時の13.87から2.25へ6.2倍改善し、ニッケル回収率は約45%を維持。低温でのCO2溶解度上昇が鉄を炭酸塩（菱鉄鉱）として沈殿させ、ニッケルを溶液中に残す。寒冷地の尾鉱再処理に適した新規プロセス。
English
Bioleaching of iron-rich mine tailings at 0°C under CO2-enriched atmosphere reduces Fe/Ni ratio from 13.87 to 2.25 (6.2-fold improvement) while maintaining ~45% nickel recovery. Increased CO2 solubility at low temperature precipitates iron as carbonate (siderite), leaving nickel in solution. This temperature-modulated approach offers selective nickel recovery from low-grade resources and is suited for cold-climate tailings reprocessing.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本では金属資源の安定供給が課題であり、低品位鉱石からの効率的なニッケル回収は資源循環の観点から重要。また、炭素隔離を同時に行う点は、カーボンニュートラルへの貢献が期待され、鉱業分野でのGX技術として注目される。
In the global GX context
This work aligns with global efforts in CCUS and critical mineral recovery. It offers a novel approach to reduce carbon footprint in mining operations while recovering valuable metals, relevant to ISSB/TCFD disclosure on climate-related risks and opportunities in the mining sector.
👥 読者別の含意
🔬研究者:Provides a novel mechanism for selective metal recovery using temperature-dependent CO2 solubility, opening avenues for further research in bioleaching and carbon sequestration.
🏢実務担当者:Mining companies can explore this low-temperature bioleaching process to improve nickel recovery from low-grade ores while sequestering carbon, potentially reducing environmental liabilities.
🏛政策担当者:Highlights a technology that supports both resource security and climate goals, relevant for policies promoting circular economy and carbon capture in the mining sector.
📄 Abstract（原文）
Abstract Recovering nickel from iron-rich mine tailings by bioleaching is held back by the co-dissolution of iron, which gives pregnant leach solutions with high Fe/Ni mass ratios and heavy downstream purification costs. This study shows that running bioleaching at 0 °C under a CO 2 -enriched atmosphere, with no post-leach iron removal step, lowers the Fe/Ni mass ratio in the leachate from 13.87 at 25 °C to 2.25 at 0 °C, a 6.2-fold improvement against a feed Fe/Ni ratio of 119:1. Nickel recovery stayed near 45% at both temperatures, showing that the fen-derived psychrotolerant consortium remained fully active near freezing. The mechanism rests on the temperature dependence of CO 2 solubility: at 0 °C, more CO 2 dissolves and raises the dissolved inorganic carbon, which drives the iron released during bioleaching to precipitate in a place as a carbonate, most plausibly siderite (FeCO 3 ), while nickel stays in solution because its carbonate is far more soluble and low dissolved nickel here stays below NiCO 3 saturation. Solid-phase data support this: the 0 °C residue gained carbon sixfold over the feed (0.360 vs. 0.060 wt%) and lost almost no iron whereas the 25 °C residue lost about 1.04% wt% iron to solution, and the extra carbon is enough to hold the retained iron as roughly 2 wt% siderite. This work establishes temperature-modulated CO 2 solubility as a previously unreported lever for selective nickel recovery from iron-rich low-grade resources, controlling iron at the source rather than downstream and well suited to cold-climate tailings reprocessing where near-freezing conditions are a natural process asset.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1007/s42461-026-01683-0first seen 2026-08-16 04:59:11
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