Patent ID: 6986192

Claim:
A method for reclamation of precious metals plated onto circuit board runners and contacts which comprises the steps of: (a) peeling said circuit board runners and contacts from the surface of a scrap circuit board, chopping said circuit board runners and contacts into approximately 10 centimeter long chunks, flattening and placing said chunks in a leaded glass beaker; (b) filling said beaker with a weak acid solution which is saturated with copper sulfate at approximately 1 pound of copper sulfate per gallon of solution; (c) introducing an electromagnetic field to said beaker at specific frequencies within the range of 7 kilohertz to 1 megahertz and power levels within the range of 0 to 400 watts and continuing the application of said field until said solution will not absorb more unwanted metals, turning said field off, pouring the loaded solution from said beaker through a screen to a precipitation tank, refilling said beaker with remaining screened metal and fresh solution, reapplying said field and repeating step (c) two to five times until there are no more said unwanted metals to shear from said precious metals and be absorbed by said solution; and (d) skimming floating metal flake from the surface of said solution, rinsing said metal flake in water and denatured alcohol, compressing said metal flake, and melting and pouring said compressed metal flake into bars or nuggets for further use or sale.