It's damn insoluble, but that doesn't suggest why the zinc isn't likewise reacted. It's most likely a rusting vs. passivation effect.
And yeah, it looks like sulfides are a stinky but possible way to seperate nickel. 10^-20 is pretty damn insoluble despite the difference, though.
Probably a lot of coprecipitation in the nonequilibrium solutions during mixing when all the crap suddenly precipitates...
Alternately, you could process it at the rate of a few coins worth per swimming pool. Then the concentration would be low enough to see some good
seperation.
Tim
Seven Transistor Labs LLC http://seventransistorlabs.com/
Electronic Design, from Concept to Layout.
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