Preparation And Properties Of New Composite Anode Materials With High Activity Of The Coating

With the in-depth understanding of the human sustainable development, green industrial technology and processes have received increasing attention.It was been higher and more stringent requirements by Save resources, environmental protection and energy saving in the "12th Five Year Plan" of national. Hydrometallurgical industry consumes lots of resources, environment and energy the non-ferrous metal industry, it caught much attention from every aspects.However, the electrode is the core of the subject and important equipment to the hydrometallurgical industry, it is known as the "heart" of the electrochemical system. The electrode is not only has affect to the electrochemical reaction rate, product quality, and energy consumption, but also has affect to the success or failure of the electrochemical reaction process. And, the performance of the electrode is a key factor in the entire electrolysis systemThe author of this article is to start from the high cost of Ti anode coating, high activity and low cost base metal oxide or a small amount of rare earth elements was used to replace the traditional of single rare metals in order to the play excellent coating performance and extend the use-life of the coating. Meanwhile, Ti-based surface of β-PbO2coated has been prepared on the surface of Ti by plating method in order to broaden the scope of application of the Ti-based anode coating, reduce manufacturing costs, to rid itself of the shackles of rare metals. And, Al was been used to the substrate of the electrode material in order to improve the performance of the electrode, Al has been coated by a layer of borides which has excellent conductivity, good corrosion resistance, it has resolved to the shortcomings of the easy dissolve of the Al in the acid, as well as intermediate layer of borides can be a good combination between coating and the substrate. It is an important objective of the present study which is dedicated to the anode coating of a low cost, high activity, low noble metal loading capacity, long use-life.The electrode material of the type of substrate and coating composition was been prepared by thermal decomposition method and plating method in the present study. By analyzing coating of the surface morphology(SEM), phase composition(XRD), electrochemical properties(LSV) and surface fractal dimension of new electrode coating in different process parameters, combined with sample preparation process, the process parameters of coating was optimized. In addition, to verify the effect of the new coated anode used in the production of electrolyte, the experimental verification of the simulated production is choose the different type of the electrode plate according to the different type of electro-deposition system. Its electrowinning cell voltage, the amount of the cathode,current efficiency, energy consumption and quality of cathode was studied in the use of the process of the actual analog.The study results showed that the best preparation parameters of base metal alternative to precious metal coating:sintering temperature450℃, holding time10min, the coating composition is RuO2-TiO2-SnO2ternary oxide. La was been doped with traditional the chlorine-type coatings of Ti-based, the optimum content of La is ωLa=1.875%. The intermediate layer is introduced on a different substrate (Ti, Al), it is not only can improve the electrochemical performance, but also can improve the bonding between the coating and the substrate, and it laid the foundation to improve electrode life. As well as, Sn-Sb oxide interlayer also added when the novel coating of the β-PbO2is prepared by plating method,,the polarization potential of the electrode can be substantially decreased in a constant current density, it can reduce450mV.Through the production of experimental studies in the different electrodeposition system, the study results showed that the different anode plate has its own applicable to electrodeposition system. The specific performance indicators of the electrodes have improved to varying degrees in the actual simulation of the process of using. New electrode has a significant effect in reduce the cell voltage, energy consumption per unit and the impurity content in the cathode precipitation products, as well as improve current efficiency, the amount of the cathode plate and the quality of the cathode product, it can save800million yuan only in the power consumption.The project’s study not only reduced the energy consumption in metallurgical industry, but also promoted the advances in electrochemical industry technology. It will have far-reaching significance on industry application of the electrode materials and contribute to the construction of economical, low-power sustainable development society.