But due to the dual reasons of management andtechnical, waste batteries pollution control is seriously lagging behind,causing the majority used batteries throw with household waste or landfill everywhere,of which the heavy metals and acid-base and other pollutants through a varietyof ways to enter the human food chain. There are still some used batteries withhousehold waste incineration landfill, causing serious pollution to atmosphere.Thebattery contains a lot of useful metals. According to relevant statistics, Chinesewaste batteries can recycle a considerable China motorcycle battery number of valuable metals each year,including 109200t manganese powder, 38200t zinc skin, 600t copper,29600t metal, 2.48t mercury.
Waste zinc-manganese dry batteries contain largeamounts of unreacted MnO2, and other forms Mn. Manganese not only one of importantcathode materials, also have quite a wide range of non-battery applications. Inrecent years, manganeses non-battery uses has gradually expanded, in additionto the traditional metallurgical, chemical, metal powder, batteries and other areas, in environmental protection, advancedbattery materials, ferrite, ceramic materials, etc. also have new uses. Sincemanganese has a strong catalytic oxidation and catalytic reduction, ion exchangeand adsorption capacity, after through suitable chemical treatment forming, itis a excellent overall performance water filter, compared with the commonlyused activated carbon, zeolite, water filter, it with stronger bleaching andremove heavy metals ability.
Therefore, from waste zinc-manganese batterieswill be recycled in various forms of manganese, has important environmental senseand good economic prospects.Currently,many countries have set up a complete battery recycling processing system, theprocessing methods mainly have pyrometallurgical recovery method andhydrometallurgical recovery method. Some Chinese researchers on this basis,through improving traditional methods, and combined with the actual production,raise some with development prospects waste batteries utilization newtechnologies and processes. From the environmental point of view, the currentfire method likely to cause serious air pollution, wet method use a lot of acid,cost too high, the treated effluent and waste likely to pollute the environment.
For the disadvantage of existing methods, Chinese researchers have proposed usingmembrane electrolysis slurry method, restore the dry cathode material in thecathode chamber, prepared manganese sulfate solution, in the anode chamber turninto the manganese oxide, manganese dioxide or manganese oxide. Here introducethe experimental methods of battery cathode material reducing and leaching inthe cathode chamber.Verticalcut some used batteries, peel off the outer skin of zinc, weigh a certainamount of grinding good positive part, by a certain liquid and solid ratio,added to the sulfuric acid solution, uniform mixing electrolyte in the cathodechamber, constant current electrolysis in all factors conditions, theelectrolysis time is 90min, every 15min sampling 3mL to filtered, sampling 1mL,diluted with deionized water to a 100mL flask, measuring the absorbance,calculating the concentration of manganese ions, and recovered.Source: