The Study On Manganese Electrolytic Deposition Process And New Anode

In electrolytic process of manganese, additives could effectively improve cathodic current efficiency and reduce energy consumption, but frequently-used SeO2is toxic and harmful to both human body and environment.. Meanwhile, abundant powder MnO2with high electrochemical activity was produced in the anode solution. As a important industrial raw material, MnO2has been widely used in dry batteries, glass, steel iron, ceramics as well as industrial manganese salt. Furthermore, it’s also the vital raw material for lithium manganate as cathode material for Lithium ion batteies. However, the value of MnO2produced from electrolysis of managanese was severely undermined for doping of Pb2+resulted from lead on surface of lead alloy anode.According to the related literatures at home and abroad, trace zinc, sulfite and polyacrylamide were chosen as novel additives based on the optimitization of electrolysis. The effects of additives on current efficiency, specific energy consumption, manganese metal morphology and purity were studied. The results showed that trace zinc-sulfite compound additive is the best additive for the prosess of electrolyze manganese. When the amount of trace zinc is4ppm, H2SO3is0.3g/L, the current efficiency is73.69%, and the specific energy consumption is6946kW-h/t, which is better than that of the practice parameters of high-purity electrolytic manganese without selenium in industry.In order to avoid the filtrati on of lead into MnO2from lead alloy in electrolytic process of managanese, we choose titanium plate widely used in ellectrolysis of MnO2as anode.The Ti/SnO2/MnO2composite anode was prepared by surface pretreatment and activation, then the influences of the composite anode for electrolytic manganese were studied. The results showed that under the same conditions, the electrolysis slot voltage and power consumption is lower, current efficiency is higher when using the Ti/SnO2/MnO2composite anode rather than the lead alloy anode. The best additive is trace zinc-sulfurous compound, the current efficiency is82.93%, and the energy consumption is6500kW-h/t, which are much better than that of lead alloy anode plate electrolysis.Using MnO2prepared through different method of anode electrolysis as manganese sources, the spinel LiMn2O4cathode was prepared by solid state method at the temperature of750℃for24h, and the electrochemical has been discussed. The results showed that LiMn2O4synthesized prepared by the Ti/SnO2/MnO2composite anode electrolyte has uniform morphology with fine particle size. The initial discharge capacity was110.4mAh/g at0.1C and remained94.9mAh/g after50cycles at1.0C rate, which are higher than that of using lead alloy anode.