| 摘要 |
<p>After partial electrolytic recovery of copper from bronze scrap, the anode sludge is washed, dried and sifted and roasted at 200-300 DEG C. and is then leached with hot dilute sulphuric acid. Copper sulphate is crystallized out from the extract. The roasting and leaching may be repeated once or twice.ALSO:After partial electrolytic recovery of copper from bronze scrap the anode sludge is washed, dried and sifted and roasted at 200-300 DEG C. and is then leached with hot dilute sulphuric acid. Copper sulphate is crystallized out from the extract. The roasting and leaching may be repeated once or twice. The washed residue is melted with a mixture of resin and borax, to which fluor-spar or sodium chloride may be added, to obtain molten tin. p The tin may be refined electrolytically leaving gold and silver in the anode sludge. Alternatively it may be dissolved in hydrochloric acid, leaving lead, copper, silver, gold, arsenic and antimony together with a little free tin. Tin may be precipitated from the solution by reduction.</p> |
