کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
686705 | 889110 | 2006 | 8 صفحه PDF | دانلود رایگان |

Biological ferric iron production was combined with ferric sulphate leaching of chalcopyrite concentrate and the effects of pH, Fe3+, temperature and solids concentration on the leaching were studied. The copper leaching rates were similar at pH of 1.0–1.8 and in the presence of 7–90 g L−1 Fe3+ despite massive iron precipitation with 90 g L−1 Fe3+. Increase of the leaching temperature from 50 °C to 86 °C and solids concentration from 1% to 10% increased the copper leaching rate. Increase in solids concentration from 1% to 10% decreased the copper yields from 80% to 40%. Stepwise addition of ferric iron did not improve the copper yields. CuFeS2, Ag and Cu1.96S potentials indicated the formation of a passivating layer, which consisted of jarosite and sulphur precipitates and which was responsible for the decreased leaching rates.
Journal: Bioresource Technology - Volume 97, Issue 14, September 2006, Pages 1727–1734