Process for the recovery of tin, tin alloys or lead alloys from printed circuit boards
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United States of America Patent
Stats
-
Nov 4, 2003
Grant Date -
N/A
app pub date -
Oct 10, 2001
filing date -
Jan 25, 1999
priority date (Note) -
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Abstract
A method for selective dissolution of tin and/or lead- or tin-containing alloys from printed circuit boards is provided comprising contacting a printed circuit board with a solution comprising Ti(IV) and an acid which forms stable and soluble salt of Ti(III), Ti(IV), Sn(II) and Pb(II), under conditions to effect dissolution of substantially all of the Sn and/or Pb-or Sn-containing alloy therefrom, as Sn(II) and/or Pb(II) and recovering from the solution by electrolytic reduction substantially all of the Sn(II) and/or PB(II) species as Sn and/or Pb. After the electrolytic reduction step, the oxidant metal species is regenerated by oxidation and recycled to the first stage of the process.
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