Process and device for recovering precious metals in industrial waste residues

The invention relates to the technical field of precious metal recovery, in particular to a technology and device for recovering precious metal in industrial waste residues. The device comprises a ball mill, a drying box is fixedly installed at the upper end of the ball mill through a connecting frame, an acid leaching box is fixedly installed on the bottom side of the ball mill, and an air heater is fixedly installed at the upper end of the drying box; an air outlet port of the air heater rotationally communicates with an air guide pipe through a connector, the bottom end of the air guide pipe fixedly communicates with an air outlet cover, a plurality of stirring frames are fixedly connected to the bottom end of the air outlet cover at intervals, a plurality of air outlets are formed in the bottom face of the air outlet cover at intervals, and a driving assembly is arranged on the side, close to the air heater, of the upper end of the ball mill. The industrial waste residues in the drying box can be fully dr