Method and apparatus for retrieving valuable metals step by step from waste printed circuit board particles

A method for retrieving valuable metals step by step from waste printed circuit board particles, comprising the following steps:

• 1) putting the waste printed circuit board particles into a rotating centrifugal supergravity separation reactor via a feeding hopper, and heating the particles by microwave and holding a temperature between 200˜300° C., and starting a variable frequency motor to drive the rotating centrifugal supergravity separation reactor and control a centrifugal supergravity coefficient between 50˜1000, with the supergravity coefficient of particles in the rotating centrifugal supergravity separation reactor to be changed through altering a rotating speed of the variable frequency motor, and separating for 2˜20 min, a tin-based alloy melting liquid as a product flows out through a filter screen and 1# printed circuit board residues are also obtained;
• 2) after the separation in step 1), continuously heating the 1# printed circuit board residues and holding a temperature between 330˜430° C., and centrifuging just as the step 1) to obtain a lead-based metal liquid and 2# printed circuit board residues;
• 3) after the separation in step 2), continuously heating the 2# printed circuit board residues and holding a temperature between 700˜900° C., and centrifuging just as the step 1) to obtain a Zn—Al—Cu alloy liquid and 3# printed circuit board residues;
• 4) after the separation, in step 3), continuously heating the 3# printed circuit board residues and holding a temperature between 1100˜1300° C., and centrifuging just as the step 1) to obtain a raw copper liquid and 4# printed circuit board residues;
• 5) after the separation in step 4), pouring out the 4# printed circuit board residues as precious metal enrichment material.