Fig. 11

Morphology of the manganese metal from optical microscopy analysis of the central part of the electrode plate. (a) Chaos-a current for 20Â min. (b) DC for 20Â min. (c) Particle size distribution of manganese nodules with DC for 20Â min (AD denotes average diameter). (d) Chaos-a current for 30Â min. (e) DC for 30Â min. (f) Particle size distribution with DC for 30Â min. (g) Chaos-a current for 60Â min. (h) DC for 60Â min. (i) Particle size distribution with DC for 60Â min. (j) Chaos-a current for 90Â min. (k) DC for 90Â min. (l) Particle size distribution with DC for 90Â min. (m) Chaos-a current for 120Â min. (n) DC for 120Â min. (o) Particle size distribution with DC for 120Â min.