| 摘要 |
<p>1533727 Detinning scrap metal M & T CHEMICALS Inc 29 June 1976 [30 June 1975] 27072/76 Heading C7B Tin scrap is supplied to a perforated rotating cylindrical anode 20 containing a helix 27 by a vibrating storage hopper and shoot 11 wherein it is in electrical contact with a caustic alkali solution and cathodes contained in tank in which the rotating anode is located. The tin is removed from the scrap metal by electrolysis and deposits on the cathodes which may be Fe or Sn. The detinned scrap is passed through the helix of the anode and is discharged from the exit end of the cylindrical anode, washed and passed to a discharge conveyer for collection. The electrolyte used may contain sodium and potassium hydroxide, sodium and potassium pyrophosphate and does not contain an oxidizing agent and may be heated by steam coils in the tank which may be enclosed by insulating side and end-walls.</p> |
