that is a 90V DC motor - you CANNOT plug it into the wall, it requires 90V of DC power. Houses are typically 120V AC power.
If you have an electrician friend, it could be converted - it will require an isolation transformer, a bridge rectifier, and a smoothing capacitor.
you can poke around here
for something like this for $30:
- you can probably take that fan off the back...68rpm isn't fast, but the torque is plenty high, you can dump your grain into your hopper and walk away while it does the job...