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Table 2 Percent increases in the leaching of Si4+, Al3+ and Ca2+.

From: Analysis of Active Ion-Leaching Behavior and the Reaction Mechanism During Alkali Activation of Low-Calcium Fly Ash

Active ions Time (h) 0.25 mol L−1 0.75 mol L−1 1.25 mol L−1 2 mol L−1
Si4+ 3 4.21 7.37 12.42 13.68
6 8.33 12.50 22.08 29.17
12 12.50 16.67 29.17 37.50
24 19.79 26.04 45.63 58.33
48 23.96 35.42 64.58 89.06
72 26.04 39.58 76.04 107.29
Al3+ 3 26.67 48.33 95.00 106.67
6 50.00 84.76 139.52 170.48
12 64.89 91.11 184.44 215.56
24 85.22 117.39 202.61 252.17
48 111.30 164.35 241.74 310.87
72 120.87 170.43 258.26 334.78
Ca2+ 3 − 94.9 − 94.9 − 94.9 − 94.9
6 − 94.4 − 95.6 − 96.3 − 95.0
12 − 94.5 − 95.1 − 95.1 − 95.1
24 − 92.4 − 92.9 − 92.9 − 92.4
48 − 91.8 − 93.0 − 93.6 − 92.4
72 − 92.4 − 92.9 − 92.9 − 93.5