Conclusion
Mn-Zn ferrite nano-particles with a mean crystallite size of 40 nm were synthesized using waste dry battery powders (PWDBs) by means of acid dissolution and a ferrite process. In the dissolution
experiment, addition of a suitable reductant is needed. It was clearly seen that the dissolution rate increased when the amount of FeSO4 increased. XRD spectra indicated that the synthesized
nano-particles contain only the spinel structured ferrite (Mn0.67Zn0.33Fe2O4). High crystallinity of the Mn-Zn ferrite could
be obtained with increasing Fe concentrations. In addition, the high saturation magnetization (63.81 emu/g) showed that the synthesized Mn-Zn ferrite is a soft magnetic material, which exhibits
minimal hysteresis. This magnetic property has great potential for application in solid and liquid separation. In summary, the method proposed in this study could be used to promote the recycling of
WDBs and contribute to the environmental protection of our Earth