628592.fig.005a
(a)
628592.fig.005b
(b)
628592.fig.005c
(c)
628592.fig.005d
(d)
628592.fig.005e
(e)
628592.fig.005f
(f)
Figure 5: The SEM images of red mud (a) uncalcined and calcined at (b) 150°C, (c) 450°C, (d) 600°C, (e) 900°C, and (f) 1200°C.