Soak the shaft and the impeller in some vinegar overnight, it might be enough to get them apart. I'd also check all your other pumps. The precipitation reaction that fried this pump will be tank wide, so there's a good chance the rest of your equipment is at risk for the same thing. This same thing happened to me once, and while it was my return pump that failed, I discovered how close to failure my skimmer pump, both Vortech's, and reactor pumps all were when I took them apart too.
Unless it's been many years since you cleaned your pump, enough calcium precipitation to fry it usually means something is off with how you're dosing. Is your mag extremely low/are you dosing too much/dosing calcium and alk in wildly different ratios?
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