Recycling of carbon and fluorine components from spent carbon anodes using mechanical activation-assisted flotation treatment
機械的活性化支援浮選による使用済み炭素陽極からの炭素・フッ素成分のリサイクル (AI 翻訳)
Yanlin Zhang, Yuan Tian, Wentao Zhong, Jun Zhou, Wei Liu, Zhen Yao, Qifan Zhong, Fuzhou Wu
🤖 gxceed AI 要約
日本語
アルミ電解で発生する有害廃棄物・使用済み炭素陽極（SCA）から、機械的活性化支援浮選により炭素とフッ素を効率的に回収するプロセスを開発。最適条件下で浮選速度定数が0.896から1.68 min⁻¹に向上し、閉回路フローの炭素回収率は77.87%に達した。回収炭素はプレベーク陽極に再利用可能で、フッ素はCaF₂として回収、尾鉱はNa₃AlF₆製品に転換され、アルミ産業の持続可能な資源循環戦略を実現する。
English
This study develops a mechanical activation-assisted flotation process to recycle carbon and fluorine from spent carbon anodes (SCAs), hazardous waste from aluminum electrolysis. Under optimal conditions, the flotation rate constant improved from 0.896 to 1.68 min⁻¹, achieving 77.87% carbon recovery in a closed-circuit flowsheet. Recovered carbon was used to prepare prebaked anodes with comparable performance, and fluorides were recovered as CaF₂, enabling a sustainable cradle-to-grave resource circulation for the aluminum industry.
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
日本のアルミ産業は資源循環と廃棄物処理の課題を抱えており、本プロセスは産業廃棄物の削減と資源の国内循環に寄与する。GX政策の循環経済移行やカーボンニュートラル目標に沿った技術として、アルミ関連企業や廃棄物処理業者にとって参考になる。
In the global GX context
This work contributes to global circular economy and industrial decarbonization by offering a viable recycling route for hazardous aluminum smelting waste. It aligns with international sustainability goals and provides a practical example for the aluminum industry to reduce waste and recover valuable resources, supporting transition to more sustainable production practices.
👥 読者別の含意
🔬研究者:Provides a novel mechanical activation-flotation method for efficient recovery of carbon and fluorine from spent anodes, with detailed process optimization and performance data.
🏢実務担当者:Offers a concrete, integrated process flowsheet for recycling SCA, enabling waste reduction and resource recovery in aluminum smelting operations.
🏛政策担当者:Highlights a technology that supports circular economy policies and hazardous waste management in the aluminum sector, potentially informing regulatory incentives.
📄 Abstract（原文）
Spent carbon anodes (SCAs) are hazardous wastes rich in carbon and flotation generated from aluminum electrolysis. This study developed an optimized mechanical activation-assisted flotation process to recycle carbon and fluorine components, with comprehensive comparisons to conventional unactivated flotation. Under optimal conditions: particle size fraction 0.25-0.15 mm, rotational speed 300 rpm, ball-to-material ratio 6:1, and activation time 90 min, mechanical activation effectively reduced particle size and increased specific surface area, enhancing carbon-reagent interaction and flotation kinetics. The flotation rate constant k was sharply improved from 0.896 min -1 (unactivated) to 1.68 min -1 (activated). A closed-circuit flotation flowsheet (one roughing, three scavenging, one cleaning) was established, yielding a carbon concentrate with 90.58 wt% carbon and 77.87% carbon recovery, far superior to 89.45 wt% and 54.49% from single roughing without staged activation. The recovered carbon, at a blending ratio of 2 wt%, was successfully used to prepare prebaked anodes with performance comparable to petroleum coke-based anodes. Dissolved fluorides in the flotation solution were recovered as CaF 2 with 95.54% removal efficiency, while flotation tailings were converted into Na 3 AlF 6 -rich products via oxidative decarbonization. The proposed integrated process enables the safe treatment and comprehensive recycling of SCAs via a simple process flowsheet, establishing a sustainable cradle-to-grave resource circulation strategy tailored to the aluminum industry.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.hazadv.2026.101449first seen 2026-08-03 04:53:20
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