论文部分内容阅读
利用嗜酸混合菌在尼日利亚闪锌矿和方铅矿中生物浸出Zn(Ⅱ)和Pb(Ⅱ),研究pH值和铁离子对闪锌矿和方铅矿浸出率的影响。结果表明:闪锌矿和方铅矿中Zn(Ⅱ)和Pb(Ⅱ)的氧化物在pH值分别为2.1和2.7时浸出效果最好。用模拟的琼脂糖培养基使细胞分泌出含铁离子的外聚合物,以此加强氧化。闪锌矿和方铅矿达到氧化平衡分别需要3和4d。闪锌矿和方铅矿在1d内的浸出率分别为38.3%和34.2%,5d内Zn(Ⅱ)和Pb(Ⅱ)分别还原92.0%和89.0%。使用XRD研究两种矿物的未浸出的剩余产物,闪锌矿的组成为S、ZnSO4和少量Ca3Al2O6,方铅矿的组成为S、PbSO4和少量的Pb(S,Ge)(O,OH)4和Pb8Co(Si2O7)3。
The bioleaching of Zn (Ⅱ) and Pb (Ⅱ) from sphalerite and galena in Nigerias by means of mixed acidophilic bacteria was carried out to study the effects of pH value and iron ion on leaching rate of sphalerite and galena. The results show that the leaching results of Zn (Ⅱ) and Pb (Ⅱ) oxides in sphalerite and galena at the pH values of 2.1 and 2.7 are the best. Oxidation is enhanced with the use of simulated agarose media to excrete the cells with extra-ferrous ions. Sphalerite and galena achieve oxidation equilibrium, respectively, 3 and 4d. The leaching rates of sphalerite and galena in 1d were 38.3% and 34.2% respectively, and Zn (Ⅱ) and Pb (Ⅱ) reduced 92.0% and 89.0% respectively within 5 days. The unleached residual products of the two minerals were studied by XRD. The composition of sphalerite is S, ZnSO4 and a small amount of Ca3Al2O6. The composition of galena is S, PbSO4 and a small amount of Pb (S, Ge) (O, OH) 4 And Pb8Co (Si2O7) 3.