钾、钠离子对氨法炼锌工艺的影响

Study on the impact of potassium and sodium ions on the ammonia method for zinc refining

  • 摘要: 研究了ZnCl2-NH3-NH4Cl-H2O炼锌工艺体系中K+、Na+对浸出过程中锌浸出率的影响,分析了K+、Na+在电沉积过程中对阴极的影响规律,进一步探究了K+、Na+对电沉积过程中锌皮质量、电流效率、电耗以及锌皮组成结构和形貌的影响。结果表明:在浸出过程中,随着溶液中K+、Na+浓度的增加,锌浸出率逐步降低;在电沉积过程中,随着电解液中K+、Na+浓度的增大,成核过电位(NOP)下降,腐蚀电流密度增大,腐蚀速率加快,致使电流效率下降、电耗增加以及锌皮产量降低,不利于阴极锌的沉积;电解液中K+、Na+浓度的增加不仅会使锌皮的形貌发生变化还有可能产生盐类结晶,会对电极产生磨损,加快电极的腐蚀。

     

    Abstract: The effects of potassium and sodium ions on the zinc leaching rates within the ZnCl2-NH3-NH4Cl-H2O zinc refining process system were studied, the influence patterns of K+ and Na+ on the cathode throughout the electrodeposition process examined, and the impacts of K+ and Na+on the quality of zinc coatings, current efficiency, power consumption, as well as the composition, structure, and morphology of these coatings throughout the electrodeposition process further explored. The findings demonstrate that the zinc leaching rate incrementally decreases as the concentration of K+ and Na+in the solution increases in the leaching process. Throughout the electrodeposition process, with an increase in the concentration of K+ and Na+in the electrolyte, the nucleation overpotential (NOP) value diminishes, the corrosion current density escalates, and the corrosion rate accelerates, culminating in diminished current efficiency, heightened power consumption, and a lowered zinc coating yield, which adversely affects the deposition of cathodic zinc. The increased concentrations of K+ and Na+in the electrolyte will not only induce alterations in the morphology of the zinc coatings but may produce salt crystallization, which can accelerate electrode wear and corrosion.

     

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