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：なぜ欧州は既に機能する技術を拡大しないのか、そしてその解決策（PAOガイド付き粒子径最適化提案を含む） (AI 翻訳)
Oleg Arnold
🤖 gxceed AI 要約
日本語
鋼スラグ炭酸化はCO2を永久固定し、建設骨材を製造する技術で、コストはDACの1/6～1/20と低い。欧州では展開が限定的だが、規制・炭素会計・組織・価格の4障壁を特定し、CEN/TS取得、MRV手法開発、実証プラント建設などの解決策を提案する。また粒子径最適化によりコスト15€/t未満の可能性も示す。
English
Steel slag carbonation permanently captures CO2 as calcium carbonate and produces construction aggregate at €20–50/tCO2, 6–20x cheaper than DAC. Despite proven technology and triple revenue streams, deployment in Europe is marginal due to regulatory waste classification, missing MRV for carbon credits, internal fragmentation, and price competition. Solutions include CEN/TS, MRV under CRCF, and a pilot plant. PAO-guided particle optimization could reduce costs below €15/t.
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
この論文は、欧州のCCUS技術展開における制度的障壁を具体的に示しており、日本のカーボンリサイクル政策やJクレジット制度の設計にも示唆を与える。特に、炭酸化のMRV手法や副産物の製品化ルートは、日本国内の鉄鋼スラグ活用と排出権取引に参考になる。
In the global GX context
This paper provides a rare techno-economic and regulatory analysis of mineral carbonation scale-up, identifying barriers that are equally relevant to global CCUS deployment. The proposed MRV methodology under the EU CRCF could serve as a template for carbon accounting in other jurisdictions. The PAO hypothesis offers a low-cost research pathway to improve process economics.
👥 読者別の含意
🔬研究者:The PAO particle size hypothesis (0.25 mm resonance node) offers a novel, testable proposal to improve carbonation efficiency and reduce energy costs; researchers should validate experimentally.
🏢実務担当者:Steel slag treatment and construction aggregate firms can assess the triple-revenue business model and consider initiating a CEN/TS petition for regulatory classification.
🏛政策担当者:EU and national regulators should prioritize developing MRV methodologies for mineral carbonation under CRCF and fund pilot plants to resolve the four identified barriers.
📄 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.19893241first seen 2026-05-17 04:56:52
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