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