A method for recovering valuable metals by a continuous heat treatment process from a lithium-based battery by using a waste battery treatment apparatus using continuous heat treatment, which includes a frame, a reaction reservoir, a vacuum forming means, and an inlet, the method comprising:
- a vacuum forming step of vacuumizing the inside of the reaction reservoir by using the vacuum forming means;
- a heat treatment step of inputting and heat-treating waste batteries to be treated by opening a gas blocking door of the inlet;
- a closing step of closing the gas blocking door in order to prevent poisonous gas or dust in the reaction reservoir from being discharged to the outside after the waste battery inputting step;
- a gas discharging step of discharging the poisonous gas and dust generated during the heat treatment through a gas outlet;
- a gas treatment step of separating and treating valuable metal powder included in the discharged dust in the gas discharging step;
- a collection step of collecting the waste battery heat-treated through the heat treatment step from the reaction reservoir;
- and
- a step of crushing or grinding the collected waste battery and thereafter, separating and recovering the valuable metal powder of the crushed or ground waste battery.