Easiest way is the Mond process. BBart is right, but it's not that dangerous.
1. Granulate the alloy as small as you can.
2. Seal the alloy and carbon monoxide (generated by Zn+CaCO3->ZnO+CaO+CO in a sealed glass vessel with heat) in a long glass vessel (for a
temperature gradient). Consider a lower-case H, with your alloy in one leg, the CO source in the other and the heated end up top. Seal off the CO
source leg after the vessel is pressurized, and you will want to get at least some kind of vacuum in the chamber to suck out the atmosphere, but I
dont think it will tamper with your reaction much (especially if you're just making nickel sulfate, and not seeking pure nickel).
3. Heat one side to at least 75*C, and the other side (decomposition) to 250*C.
The nickel and only the nickel will be deposited on the hot side- Just be careful when you open the vessel, do it outside! CO is toxic!
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