高铁生物堆浸液Na2S2O3回收铜新工艺

在生物浸铜过程中,Fe3+杂质逐步积累,当堆浸液中Fe3+浓度过高时,将使铜的萃取难以进行.本研究采用硫代硫酸钠处理高铁生物堆浸液使铜得到回收,当高铁生物堆浸液Cu2+为7.41g/L、TFe为27.9 g/L、Fe3+为14.68 g/L时,在反应温度为80℃,硫代硫酸钠用量为18 g/L,反应时间为60 min条件...

Novel Technology on Recovering Cu by Using Na_2S_2O_3 from Bio-heap Leaching Solution Containing High Concentration of Fe~(3+)

Copper can be extracted from a low-grade copper ore by means of microbiological leaching.In the leaching process,copper and the impurities such as Fe^3＋ were leached and enriched gradually due to the acid in solution.When the Fe^3＋ content accumulated to a certain amoun,it would jeopardize the normal leaching process.Na2S2O3 was used to treat bio-heap leaching solution containing high iron.When the content of Cu^2＋,total Fe and Fe3＋ was 7.41 g·L^-1,27.9 g·L^-1 and 14.68 g·L^-1,respectively,the reduction rate of Fe3＋ and precipitation rate of iron and copper achieved 99.69%,17.52% and 99.96% at 80 ℃ for 60 min with 18 g·L^-1 of the amount of sodium thiosulfate.After treatment,the Cu,S and Fe content of the precipitated residues obtained was 46.61%,27.85% and 3.23%,respectively and the main phase was confirmed to CuS and S.