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采用纯种L.ferrooxidans菌研究矿浆浓度、pH及外加Fe3+离子对铁闪锌矿生物浸出的影响。结果表明,锌的浸出率随着矿浆浓度的降低而增加。在生物浸出过程中调节pH值到1.6对铁闪锌矿的溶解有促进作用。外加Fe3+离子加速了铁闪锌矿的生物浸出,但当外加Fe3+离子浓度超过2.5g/L时,促进作用变弱。这是因为高浓度的Fe3+离子会对细菌生长产生抑制作用且促进黄钾铁矾的生成。在L.ferrooxidans菌存在条件下,利用电化学测试方法进一步了解有、无外加Fe3+离子时铁闪锌矿的溶解过程。实验数据表明,外加Fe3+离子可以增加腐蚀电流密度,有利于锌的提取。交流阻抗谱表明,添加Fe3+离子后没有改变反应过程的控制步骤。
The effect of pulp concentration, pH and Fe3 + addition on the bioleaching of marmatite was studied using pure L. ferrooxidans. The results show that the leaching rate of zinc increases with the decrease of pulp concentration. Adjusting the pH to 1.6 during bioleaching promoted the dissolution of marcelite. Exogenous Fe3 + ions accelerated the leaching of marmatite, but the acceleration was weakened when the concentration of Fe3 + ions was over 2.5g / L. This is because high concentrations of Fe3 + ions can inhibit bacterial growth and promote the production of jarosite. In the presence of L. ferrooxidans, the electrochemical test was used to further understand the dissolution of marmatite with and without Fe3 +. Experimental data show that the addition of Fe3 + ions can increase the corrosion current density is conducive to the extraction of zinc. AC impedance spectroscopy showed that adding Fe3 + ions did not change the control step of the reaction process.