Slag Carbonation for CO₂ Capture: Why Europe Is Not Scaling a Technology That Already Works — and How to Fix It (with a PAO‑guided Particle Size Optimisation Proposal)
スラグ炭酸化によるCO₂回収：なぜ欧州はすでに機能する技術をスケールアップできないのか、そしてその解決策（PAO誘導粒子径最適化提案を含む） (AI 翻訳)
Oleg Arnold
🤖 gxceed AI 要約
日本語
本稿は、製鋼スラグの炭酸化によるCO₂回収技術が欧州で普及しない4つの障壁（規制分類、炭素クレジット会計、組織分断、天然骨材との価格競争）を特定し、PAO誘導粒子径最適化による低コスト化を提案する。経済分析に基づき、EU ETS炭素クレジットと炭酸化骨材販売による収益モデルを示し、規制改革とMRV手法開発を提言する。
English
This paper identifies four barriers preventing the scale-up of steel slag carbonation in Europe: regulatory classification as waste, absence of MRV methodology, organizational fragmentation, and price competition. It proposes PAO-guided particle size optimization to reduce CO₂ capture cost below €15/t. Economic analysis shows viability with revenue from EU ETS credits and carbonated aggregate sales. The paper calls for regulatory reform and development of a carbon removal certification framework.
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
日本も年1000万トン以上の鉄鋼スラグを排出し、同様の規制・経済的課題を抱える。本稿の障壁分析と制度提言は、日本のGX政策、特に炭素クレジット制度や廃棄物規制の見直しに示唆を与える。
In the global GX context
This paper is globally relevant as it addresses a proven low-cost carbon capture technology that is ready for deployment. It highlights non-technical barriers (regulation, carbon accounting) that are common across jurisdictions. The PAO hypothesis offers a potential breakthrough in cost reduction, and the call for CEN technical specification and MRV under EU CRCF provides a blueprint for other regions.
👥 読者別の含意
🔬研究者:Researchers can test the PAO hypothesis for particle size optimization to validate cost reduction; the paper provides a clear experimental plan.
🏢実務担当者:Corporate sustainability teams in steel and construction can evaluate the economics of slag carbonation and consider pilot projects.
🏛政策担当者:Policymakers should note the regulatory barriers and consider fast-tracking technical specifications and MRV methodologies for mineral carbonation under carbon removal frameworks.
📄 Abstract（原文）
The technology works. The chemistry is free. What is missing is not invention. It is permission. Steel slag carbonation is a proven, commercially demonstrated technology that permanently captures CO₂ as stable calcium carbonate and converts industrial waste into construction aggregate. It costs EUR 20–50 per tonne of CO₂ — 6–20 times cheaper than Direct Air Capture. It generates three simultaneous revenue streams: gate fees for waste disposal, EU ETS carbon credits (€60–90/t CO₂), and sale of carbonated aggregate (€10–25/t). Europe produces approximately 100 million tonnes of steel slag per year with a theoretical CO₂ capture potential of 22 million tonnes per year — 0.7% of EU annual emissions. The technology exists. The economics work. Yet deployment in Europe remains marginal. This document identifies the four specific barriers preventing European scale‑up and proposes a practical pathway to overcome them. Barrier 1 — Regulatory classification Carbonated slag is still classified as waste, not as a secondary raw material. CE marking requires a European Technical Assessment (ETA) that costs €200,000–500,000 and takes 2–4 years. Barrier 2 — Carbon credit accounting ambiguity No established Monitoring, Reporting and Verification (MRV) methodology exists for mineral carbonation under EU ETS. Without it, project finance is impossible. Barrier 3 — Organisational fragmentation at steel companies Slag handling and energy/environmental departments operate independently. Internal cooperation and capital approval move slowly. Barrier 4 — Price competition with natural aggregate Natural gravel costs €5–12/t. There is no mechanism to pay a green premium for the embedded carbon capture benefit. All four barriers are solvable. The document provides concrete actions for each. PAO‑guided particle size optimisation (new in this document) The Alpha‑Omega Paradigm (PAO) predicts that slag particles ground to 0.25 mm reach a resonance node on the R‑scale (N = –129, Δ = 0.001). At this size, surface energy is minimised and agglomeration is reduced, leading to faster carbonation and lower energy cost. Hypothesis: 0.25 mm particles will show higher CO₂ uptake per unit crushing energy than current practice (2 mm). Test cost: EUR 5,000–15,000. Duration: 4–8 weeks. Potential outcome: CO₂ capture cost below €15/t — cheaper than any other method at scale. Economics (based on a 1,000 m³/hour flue gas unit) · CO₂ captured: 237 kg/hour · Slag consumed: 1.07 tonnes/hour · Carbonated aggregate produced: 1.18 tonnes/hour · Net profit (conservative scenario): €43/hour → ~€30,700/month What is needed for European scale‑up 1. Regulatory: Petition for a CEN/TS (European Technical Specification) for carbonated slag aggregate. Cost: €50,000–150,000. Timeline: 18–36 months. 2. Financial: Develop an MRV methodology for mineral carbonation under the EU Carbon Removal Certification Framework (CRCF). Cost: €500,000–1,000,000. Timeline: 12–18 months. 3. Commercial: One pilot plant at a German steel plant (Thyssenkrupp, Salzgitter, SSAB). Cost: €3–8 million for 10,000 t CO₂/year. Revenue covers operating costs at current ETS prices. Who is already doing it · Carbon8 Systems (UK) — commercial · MCi (Australia) — scaling up · CarbonCure (Canada/Global) — 700+ plants · Calix (Australia/EU) — commercial The technology is not the barrier. The regulation, the carbon accounting methodology, and the internal organisation of steel companies are the barriers. All three are solvable.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.5281/zenodo.19893242first seen 2026-05-17 04:57:10
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