Portable metal extraction machine and method of using

Details Portable metal extraction machine and method of using Portable metal extraction machine and method of using

1994-05-09

1995-10-10

Andrews, Melvyn

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

294264, 29762, 241 14, 241 65, 241283, 241DIG37, 266137, C22B 700

Patent

active

054567386

ABSTRACT:
A process and apparatus for extracting gold from circuit boards, gold fingers and gold pins is described comprising the steps of applying liquid nitrogen directly to the surface of the circuit boards, gold fingers and gold pins, thus freezing the gold. A vibration is then instituted to loosen the gold from the substrate to which it was attached. The gold flakes or particles are then collected by a high powered vacuum apparatus.

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