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采用纯种Sulfobacillus thermosulfidooxidans菌进行铁闪锌矿的生物浸出及电化学实验,研究颗粒大小、p H值控制和外加Fe3+离子对锌浸出的影响。结果表明:在生物浸出过程中铁闪锌矿生物浸出的最佳粒度范围为0.043~0.074 mm;定期调整p H值至初始值对获得较高的浸出率有重要影响;外加Fe3+离子能加速铁闪锌矿的生物浸出,但当外加Fe3+离子浓度超过2.5 g/L时,促进作用变弱,甚至阻碍铁闪锌矿的溶解。SEM和XRD分析浸渣发现,在矿物表面形成一层由单质硫和黄钾铁矾组成的产物层,并导致后期的浸出速度低。电化学测试实验结果表明,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 bioleaching and electrochemical experiments of marmatite were carried out with pure strain Sulfobacillus thermosulfidooxidans to study the effects of particle size, p H value and addition of Fe3 + on zinc leaching. The results showed that the best size range of biomaterial leaching from marmatite was 0.043 ~ 0.074 mm during bioleaching. The regular adjustment of p H value to the initial value had an important influence on the leaching rate. Fe3 + ion accelerated the iron flash However, when the concentration of Fe3 + ions exceeds 2.5 g / L, the promotion effect is weakened and even hindered the dissolution of marmatite. SEM and XRD analysis of the leaching residue revealed that a layer of product consisting of elemental sulfur and jarosite formed on the mineral surface and resulted in a low leaching rate at the later stage. Electrochemical test results 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.