Leaching of Chalcopyrite in Acidified Nitrate Using Seawater-Based Media
AbstractThe leaching of copper from industrial copper ore with 4.8 wt % chalcopyrite by acidified nitrate with seawater based media was investigated. Water quality (pure water and seawater), temperature (25–70 °C), reagent concentration, and nitrate type (sodium and potassium) were studied variables. Leaching conditions were: 100 g ore/1 L solution; P80 of 62.5 µm; 400 rpm and leaching time, varying between 3 and 7 days. Nitrates in sulfuric acid are known to be good oxidants for sulfide ores. This study showed that up to 80 wt % copper could be extracted at 45 °C in 7 days. In the absence of nitrate, under the same leaching conditions, only a 28 wt % copper extraction was achievable. The extraction rate increased to 97.2 wt % when leach temperature was increased to 70 °C in nitrate-chloride-acid media. The presence of chloride ions also increased the copper extraction rate. The copper extraction achieved in seawater systems were higher than in water systems under the same leaching conditions (increased by an average of 18 wt %). This effect can be attributable to the contribution of chloride that increases proton (H+) activity. View Full-Text
Share & Cite This Article
Hernández, P.C.; Taboada, M.E.; Herreros, O.O.; Graber, T.A.; Ghorbani, Y. Leaching of Chalcopyrite in Acidified Nitrate Using Seawater-Based Media. Minerals 2018, 8, 238.
Hernández PC, Taboada ME, Herreros OO, Graber TA, Ghorbani Y. Leaching of Chalcopyrite in Acidified Nitrate Using Seawater-Based Media. Minerals. 2018; 8(6):238.Chicago/Turabian Style
Hernández, Pía C.; Taboada, María E.; Herreros, Osvaldo O.; Graber, Teófilo A.; Ghorbani, Yousef. 2018. "Leaching of Chalcopyrite in Acidified Nitrate Using Seawater-Based Media." Minerals 8, no. 6: 238.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.