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首页> 外文期刊>International Journal of Electrochemical Science >Influence of Temperature and Potential on the Electrochemical Dissolution of Galena in HNO3 at pH 2.0
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Influence of Temperature and Potential on the Electrochemical Dissolution of Galena in HNO3 at pH 2.0

机译：温度和电势对方铅矿在pH 2.0下HNO 3 中电化学溶解的影响

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We investigated the influence of temperature and add potential on the electrochemical dissolution of galena in HNO3 at pH 2.0. Potentiodynamic curves showed galena different electrochemical reaction states. From OCP to 160 mV (vs. saturated calomel electrode) galena was passivated with S0, 160-320 0 2- mV was active dissolution, S transformed into S2O3 , and potential above 320 mV was double- 2- 2- inductive area, S2O3 transformed into SO4 . High temperature accelerates galena electrochemical dissolution, when temperature increases from 25 °C to 40 °C, and then to 55 °C, the promotion efficiency is 233.33% and 322.22%, respectively. Electrochemical impedance spectroscopy (EIS) results are well in agreement with the three potential regions, and reveal the cause that high temperature accelerates galena electrochemical due to decreases charge transform resistance and passive resistance at passive potential area. These experimental results will give experimental basis for galena weathering explains and hydrometallurgy applied.
机译：我们研究了温度和添加电势对方铅矿在pH 2.0的HNO3中的电化学溶解的影响。电位动力学曲线显示方铅矿不同的电化学反应状态。从OCP到160 mV（与饱和甘汞电极相比），将方铅矿用S0钝化，将160-320 0 2- mV主动溶解，将S转化为S2O3，而在320 mV以上的电势是2--2-感应面积的两倍，即S2O3。转化为SO4。高温加速方铅矿的电化学溶解，当温度从25°C升高到40°C，然后再升高到55°C时，促进效率分别为233.33％和322.22％。电化学阻抗谱（EIS）结果与这三个电位区域非常吻合，并揭示了高温导致方铅矿电化学加速的原因，这是由于降低了无源电位区域的电荷转换电阻和无源电阻。这些实验结果将为方铅矿的风化解释和湿法冶金提供实验依据。

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