That power (torque and speed) work out to about 10W at the output shaft; due to friction and inefficiencies, it will need rather more than that from the power source.
Probably near 2A at 9V.
The idea should work if your torque estimate is correct, but you will need a better, much larger, battery pack, something like a bank of NiMh rechargeables or some other high current capable cells.
A 9V battery can not provide high currents, I'd guess possibly 30 - 100mA before the voltage just collapses due to its internal resistance.