Fig. 7

SEM analysis of the crystal product at surface loading = 6.9 kg m^− 2 h^− 1, (a) < 0.355 mm, (b) 0.355–0.7 mm, (c) > 0.7 mm, (d) at surface loading = 55 kg m^− 2 h^− 1 at > 0.7 mm. (e) a schematic diagram of the layered growth of crystals. XRD analysis of crystals at surface loading = 6.9 kg m^− 2 h^− 1, (f) < 0.355 mm, (g) 0.355–0.7 mm, (h) > 0.7 mm, (i) at surface loading = 55 kg m^− 2 h^− 1 at > 0.7 mm