| 摘要 |
<p>A method for the recovery of metallic lead from substances containing lead, such as lead ores galena or exhausted lead acid storage batteries. The method includes the steps of treating the lead containing substances, either with or without a preliminary preparation such as heating or roasting in oxygen-poor air, with an aqueous acid solution in which lead (II) salts are soluble, in particular with a concentrated acetic acid solution containing ammonium acetate in which lead (II) salts are soluble, and with use of a metal having a reduction potential more negative than lead. The metallic lead is then recovered by separating the same from the lead containing substance. The separation occurs by precipitating or cementing the lead with a metal such as iron or zinc having a reduction potential more negative than lead. The resulting aqueous acid solution containing ions of the metal with a reduction potential more negative than lead, especially iron, is treated to recover acetic acid and to precipitate out ferrous sulphate hydrate. Alternatively, the concentrated acetic acid containing ammonium acetate is cooled and treated to precipitate out desired compounds of the metal with a reduction potential more negative than lead.</p> |
