Solid material comminution or disintegration – Processes – With classifying or separating of material
Patent
1995-03-08
1997-10-14
Morgan, Eileen P.
Solid material comminution or disintegration
Processes
With classifying or separating of material
241 791, 241 80, 241121, 451 28, B02C 700
Patent
active
056763182
ABSTRACT:
In a method of grinding a printed circuit board, a printed circuit board having various parts mounted thereon, or a residual ground product produced in the manufacturing process for the boards, and recovering valuable substances by separating the ground product into a portion containing a large amount of metal component such as copper and a portion consisting a resin, a filler material, and the like through a separation step, the separation step includes a specific gravity separation step of separating the ground product into a portion containing a large amount of substance having a high specific gravity and a portion containing a large amount of substance having a low specific gravity, and an electrostatic separation step of separating the ground product into a portion having a large amount of conductor and a portion containing large amount of insulator. The grinding step includes a coarse grinding step and a fine grinding step.
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Iji Masatoshi
Yokoyama Sadahiko
Morgan Eileen P.
NEC Corporation
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