Figure 1. Process flow diagram of fabrication Ni nano powder from waste iron-nickel alloy etchant.
Figure 2. The change of metal concentrations through each processes hydroxide precipitation by (a) NaOH solution and (b) NH3 solution.
Figure 3. Simplified Pourbaix diagram for Fe/Ni.
Figure 4. (a) SEM image (b) XRD pattern and TEM images (insets) of the fabricated nickel nano powder layer.
Table 1. The metal composition of waste solution
Table 2. The metal composition through each process
Table 3. The composition of manufactured nickel nano powder in this experiment
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