Atmospheric Carbon Capture Performance of Legacy Iron and Steel Waste

Huw Pullin, Andrew W. Bray, Ian T. Burke, Duncan D. Muir, Devin J. Sapsford, William M. Mayes, Phil Renforth

Research output: Contribution to journalArticle

Abstract

Legacy iron (Fe) and steel wastes have been identified as a significant source of silicate minerals, which can undergo carbonation reactions and thus sequester carbon dioxide (CO2). In reactor experiments, i.e., at elevated temperatures, pressures, or CO2 concentrations, these wastes have high silicate to carbonate conversion rates. However, what is less understood is whether a more "passive" approach to carbonation can work, i.e., whether a traditional slag emplacement method (heaped and then buried) promotes or hinders CO2 sequestration. In this paper, the results of characterization of material retrieved from a first of its kind drilling program on a historical blast furnace slag heap at Consett, U.K., are reported. The mineralogy of the slag material was near uniform, consisting mainly of melilite group minerals with only minor amounts of carbonate minerals detected. Further analysis established that total carbon levels were on average only 0.4% while average calcium (Ca) levels exceeded 30%. It was calculated that only ∼3% of the CO2 sequestration potential of the >30 Mt slag heap has been utilized. It is suggested that limited water and gas interaction and the mineralogy and particle size of the slag are the main factors that have hindered carbonation reactions in the slag heap.

Original languageEnglish
Pages (from-to)9502-9511
Number of pages10
JournalEnvironmental Science and Technology
Volume53
Issue number16
Early online date18 Jul 2019
DOIs
Publication statusPublished - 20 Aug 2019

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Carbon capture
Steel
slag
Slags
Iron
steel
iron
Carbonation
carbon
Mineralogy
carbon sequestration
mineralogy
Carbonate minerals
Silicate minerals
melilite
carbonate
Silicates
Carbonates
silicate mineral
mineral

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Pullin, H., Bray, A. W., Burke, I. T., Muir, D. D., Sapsford, D. J., Mayes, W. M., & Renforth, P. (2019). Atmospheric Carbon Capture Performance of Legacy Iron and Steel Waste. Environmental Science and Technology, 53(16), 9502-9511. https://doi.org/10.1021/acs.est.9b01265
Pullin, Huw ; Bray, Andrew W. ; Burke, Ian T. ; Muir, Duncan D. ; Sapsford, Devin J. ; Mayes, William M. ; Renforth, Phil. / Atmospheric Carbon Capture Performance of Legacy Iron and Steel Waste. In: Environmental Science and Technology. 2019 ; Vol. 53, No. 16. pp. 9502-9511.
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Pullin, H, Bray, AW, Burke, IT, Muir, DD, Sapsford, DJ, Mayes, WM & Renforth, P 2019, 'Atmospheric Carbon Capture Performance of Legacy Iron and Steel Waste', Environmental Science and Technology, vol. 53, no. 16, pp. 9502-9511. https://doi.org/10.1021/acs.est.9b01265

Atmospheric Carbon Capture Performance of Legacy Iron and Steel Waste. / Pullin, Huw; Bray, Andrew W.; Burke, Ian T.; Muir, Duncan D.; Sapsford, Devin J.; Mayes, William M.; Renforth, Phil.

In: Environmental Science and Technology, Vol. 53, No. 16, 20.08.2019, p. 9502-9511.

Research output: Contribution to journalArticle

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Pullin H, Bray AW, Burke IT, Muir DD, Sapsford DJ, Mayes WM et al. Atmospheric Carbon Capture Performance of Legacy Iron and Steel Waste. Environmental Science and Technology. 2019 Aug 20;53(16):9502-9511. https://doi.org/10.1021/acs.est.9b01265