| 摘要 |
<p>905,241. De-tinning scrap metal. KNIPPERS, G. May 12, 1960 [May 23, 1959], No. 16835/60. Class 41. Scrap tin-plate is de-tinned electrolytically using an electrolyte, preferably an alkaline carbonate, to which is added an organic liquidmiscible with it, e.g. a low molecular alcohol. The electrolyte contains 35 to 45 g. per litre of alkali calculated as Na 2 O, and may be added as carbonate, and 5 to 20% by volume of MeOH. Operating temperatures of 60‹ to 80‹ C., using 2.8 to 3 v. at 2500 amps. A suitable apparatus consists of a steel vessel 17 heated at the base 9, and in which is mounted an open drum cathode 4 and an inner wire basket 3 connected through bars 10 to the anode leads 5. The contacts 2 are of copper amalgam. The bales of compressed scrap are preferably treated with electrolyte in vacuo, and loaded into the basket 3 without dis-membering. Tin is deposited on the cathode as a powder, and any oxygen formed at the anode is directed upwards away from the cathode deposit by funnel-shaped louvres mounted outside the inner basket member. The tin deposit is scraped and remelted in a reducing atmosphere with or without addition of ammonium chloride and borax.</p> |
