Preparation And Performance Study Of Titanium-based Oxide Chlorine Evolution Anode For Electrolytic Manganese

There are two main methods for refining metal manganese:thermal method?fire method?and electrolytic method?wet method?.The purity of thermal method?manganese metal?does not exceed 95-98%,while pure metal manganese is prepared by electrolytic method Electrolytic metal manganese),its purity can reach more than99.7?99.9%.Electrolytic production has become the main method of manganese production.The role of metal manganese is to increase the hardness of metal alloy materials.The most widely used are manganese copper alloys,manganese aluminum alloys,and 200 series stainless steels.Manganese can improve the strength,toughness,wear resistance and corrosion resistance of these alloys.The price of electrolytic manganese is mainly affected by sup ply and demand,electricity and raw materials.Metal manganese electrolysis is a process of high energy consumption.Improving current efficiency and lowering the energy consumption are the most concerned issues in production practice.This article focuses on the study of anode materials and their modification of H manganese electrolytic metal manganese in chloride system.This article mainly focused on the effects of ultrasonic pretreatment,tin-cobalt molar ratio and calcination temperature on the perfor mance of titanium-based tin-ruthenium-cobalt oxide anode.As well as the effect of tin-zirconium molar ratio and the number of brushing times on the performance of titanium-based tin-ruthenium-cobalt oxide anode were also studied.At the same time,a small-scale experiment for preparing electrolyzed metal manganese in an H-type electrolytic cell in a chloride system was studied,and its cell voltage,current efficiency and energy consumption were studied to evaluate its economic indicators.Scanning electro n microscopy?SEM?was used to analyze the micro-morphology of the prepared coating,and X-ray diffraction?XRD?was used to analyze the composition of the phase of the prepared coating.The electrochemical performance of the coating was analyzed using electrochemical workstations to measure the anodic polarization curve?LSV?,alternating current impedance test?EIS?,and cyclic voltammetry curve?CV?.The preparation process of the titanium-based tin-ruthenium-cobalt oxide coating electrode include ultrasound to pretreat the precursor,control Sn:Ru:Co molar ratio of6:1:0.8 and the sintering temperature of 550°C.Under this condition,there are fewer cracks on the coating surface.The surface roughness is the largest and the active area is the largest.XRD shows that the solid phase of the main phases,tin?ruthenium and cobalt oxide,forms a solid solution with each other.The electrochemical test shows that the chlorine evolution potential reaches the lowest(the lowest chlorine evolution potential of 1.165V the electrode obtained at a current density of 500A·m^-2)and the electrocatalytic activity is the best.Analysis of the results of Ti-based tin-ruthenium-cobalt-zirconium oxide coated electrodes by different tin-zirconium molar ratios?brushing times and calcination temperatures showed that as the zirconium content increased,the electrocatalytic activity of the electrode increases first and then decreases.At the same time,the density of the surface of the tin-ruthenium-cobalt-zirconium oxide also increased first and then decreased;with the increase of the number of brushing times and the increase of the calcination temperature,the density of the electrode surface also increased and then decreased;and when When the molar ratio of Sn:Ru:Co:Zr is 6:1:0.8:0.3,the number of brush coatings is 13 and the calcination temperature is 500°C,the prepared titanium-based tin-ruthenium-cobalt-zirconium oxide-coated electrode has the largest surface roughness,the largest active area,and the bes t electrocatalytic activity(the lowest chlorine evolution potential of 1.184V the electrode obtained at a current density of 500A·m^-2).Through the small-scale experiments of electrolytic manganese metal in the H-type electrolytic cell of the chloride sys tem,it was found that the current efficiency of the metal manganese electrolytic product increased first and then decreased with the increase of temperature and p H,and the energy consumption showed the trend of decreasing first and then increasing then d ecreasing.The economical index of manganese electrowinning is the best when the p H equals 6.50 and the temperature of the bath is 35°C.The comparison of different electrodes shows that the titanium-based tin-ruthenium-cobalt-zirconium oxide electrode?p repared?has the lowest energy consumption?4357.1 k W·h/t·Mn?and the largest current efficiency?72.03%?.It was also found that during electrolysis,the Ti/Sn-Sb-RuOx/?-PbO₂/?-PbO₂?prepared?lead dioxide layer was easily dissolved and fall off.