Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1982-09-29
1984-01-17
Powell, William A.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
75101R, 156642, 156664, 156345, C23F 102, B44C 122, C03C 1500, C03C 2506
Patent
active
044262515
ABSTRACT:
A self-contained portable device for quickly and efficiently recovering a precious metal, such as gold, from bimetallically coated substrate material, such as printed circuit board connectors or tabs. The base metal to which the desired precious metal is bonded must be soluable in nitric acid and be partially exposed. The device includes a processing chamber into which the material to be processed is placed. An etching solution, having a prescribed composition that typically includes nitric acid and at least one effervescent compound, is used to dissolve away the base metal, causing a tunneling effect to free the desired precious metal. Selected agitation, coupled with the frothing action of the effervescent compound(s), greatly enhance the rate at which the precious metal is freed from the bimetallic material. Recirculation of the etching solution from a storage tank to the processing chamber, and vice versa, allows a relatively small amount of the etching solution to be used. At appropriate intervals, spent etching solution may be discharged from the storage tank and fresh solution introduced. A filter interposed in the recirculation channel catches and holds the desired precious metal, and provides a convenient collection point for removing the recovered precious metal from the device.
REFERENCES:
patent: 4261738 (1981-04-01), Valentine et al.
Aho Robert L.
Haugen Peter N.
Ida Noble
Lucas Andrew A.
Nelson Paul E.
Gold Bryant R.
Powell William A.
Storage Technology Corporation
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