Process for the recovery of tin, tin alloys or lead alloys from printed circuit boards
    1.
    发明授权
    Process for the recovery of tin, tin alloys or lead alloys from printed circuit boards 有权
    从印刷电路板回收锡,锡合金或铅合金的工艺

    公开(公告)号:US06641712B1

    公开(公告)日:2003-11-04

    申请号:US09889980

    申请日:2001-10-10

    IPC分类号: C25C708

    摘要: 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.

    摘要翻译: 提供了一种用于从印刷电路板选择性溶解锡和/或含铅或锡的合金的方法,包括使印刷电路板与包含Ti(IV)的溶液和形成稳定和可溶的Ti(III)的盐的溶液接触 ),Ti(IV),Sn(II)和Pb(II)作为Sn(II)和/或Pb(II)的条件下实质上溶解基本上所有的Sn和/或Pb-或Sn- II),并且通过电解还原基本上所有的Sn(II)和/或PB(II)物质作为Sn和/或Pb从溶液中回收。 在电解还原步骤之后,氧化剂金属物质通过氧化再生并再循环到该工艺的第一阶段。