Atmospheric Carbon Capture Performance of Legacy Iron and Steel Waste

• DOI: 10.1021/acs.est.9b01265
• Publication Date: 2019-07-18T11:58:42Z
• Authors: Huw Pullin; Andrew W. Bray; Ian T. Burke; Duncan D. Muir; Devin J. Sapsford; William M. Mayes; Phil Renforth
• Keywords: Slag (welding); Silicate minerals; Heap (data structure); Carbonate minerals

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