Experimental Study on Diffusion Process of Sulfate Ion in Cemented Gangue Backfill Material

Figure 7

SEM images (180 d) and XRD patterns of CGBM immersed in different solutions. (a) Uneroded, (b) 5% Na₂SO₄ solution, (c) 5% Na₂SO₄ + 5% MgSO₄ composite solution, (d) 5% Na₂SO₄ + 5% NaHCO₃ composite solution, and (e) 5% Na₂SO₄ + 5% MgSO₄ + 5% NaHCO₃ composite solution.

(a)

(b)

(c)

(d)

(e)