LR1130 battery.Waste zinc-manganese battery recycling process flow

　　The recycling of used zinc-manganese batteries mainly solves two problems. The first is the recovery of metallic mercury and other useful substances, and the second is the treatment of waste gas, waste liquid and waste residue. After many comparative experiments, we proposed the "roasting-electrolysis" recycling process, which mainly includes processes such as roasting, liquid making, electrolysis, and waste gas and waste residue treatment.

　　Since mercury metal mainly exists on paste paper and zinc cylinders, in order to facilitate the evaporation of mercury vapor, the waste zinc-manganese batteries are first mechanically cut, and the carbon rods, copper caps, and plastics are sorted out, so that the powder and zinc inside the battery are The cylinder is fully exposed, and the carbon rods, copper caps, and plastics are recycled at the same time. The unrecovered components are sent to a sealed roasting furnace and roasted at a temperature of 600°C for 3 hours without air (thermogravimetric analysis shows that the reaction is completed at 600°C). At this time, the manganese dioxide in the battery has been evenly combined with acetylene black, and is reduced to manganese monoxide during roasting, which is convenient for leaching with sulfuric acid (manganese dioxide must be dissolved with concentrated sulfuric acid and carbon powder at a temperature of 383K ).

　　The tail gas produced by roasting contains mercury, wax, hydrogenated hydrogen and ammonia. After being exported from the roasting furnace, it passes through the condensation tank to condense and recover most of the mercury vapor. The tail gas enters the spray tank, sprays with water (pH=6), and absorbs Ammonia, carbon dioxide and wax. The spray water is recycled. When the chloride reaches saturation, activated carbon is added to absorb the remaining mercury metal. After filtration and evaporation of the filtrate, chloride crystals are produced. The residual exhaust gas is finally discharged after passing through the bubble tower purifier, which can fully meet the national atmospheric emission standards.

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