358 fractures caused by the solidification of the BFS slurry. These results suggest that the solidification reactions of the injected BFS slurry progressed over time, decreasing the permeability of the goaf. Accordingly, this also indicates the possibility that CO₂ was mineralized in the goaf through solidification reactions with the injected CO₂ MNB water and BFS slurry. Table 2 – Results of injection trial Dat e Water CO2 MNB water BFS slurry fro m to Total injection volume (L) Injection rate (L/min) Total injection volume (L) Injection rate (L/min) Total injection volume (L) Injection rate (L/min) 7/2 3 5,000 50 7/2 5 10:3 0 13:3 0 6,030 40-130 8/2 3 14:1 5 14:4 5 2,800 100 8/2 4 9:30 10:2 0 5,880 100-175 8/2 5 13:1 0 13:3 0 2,700 150 8/2 6 8:50 9:08 2,740 150 8/2 7 9:05 12:3 0 30,000 150 8/2 9 9:25 9:30 250 50 9:30 10:0 8 1,800 48 10:0 8 10:5 2 2,040 46 10:5 2 12:2 0 4,550 50 12:2 0 14:1 1 5,630 50 14:1 2 14:3 1 1,000 55 14:3 0 8/3 0 6:42 53,830 45-100 6:43 11:0 8 12,780 50 11:1 0 12:5 7 5,380 50 12:5 15:4 8,850 50
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