| 摘要 |
<p>1470876 Copper recovery ISC SMELTING Ltd 24 July 1975 [23 Aug 1974] 37096/74 Addition to 1399281 Heading C1A Aqueous ammoniacal leach solutions containing Zn and/or Pb ion impurities and resulting from the leaching of copper dross are treated to recover dissolved copper values by contacting the solution with a copper selective organic solvent, e.g. LIX 64N or LIX 65N (Registered Trade Marks) in kerosene, to saturate the organic phase with copper followed by separating the loaded organic phase and aqueous phase and then diluting the copper concentration in the organic solvent, e.g. by mixing with fresh organic solvent or recycled copper-stripped solvent, and washing the diluted organic phase with weak aqueous acid such as aqueous H 2 SO 4 and thence stripping the copper from the organic phase with a strong aqueous acid, e.g. aqueous sulphuric acid, to give an aqueous copper salt solution. Saturation loading of the solvent with copper results in a low zinc impurity loading while the dilution step prevents formation of the intermediate phase usually encountered in saturation loading at the organic-aqueous interface and excessive transfer of copper from the organic phase during the weak aqueous acid wash. The wash step removes any remaining co-extracted zinc, lead or ammonium ions from the loaded organic phase.</p> |
