a．The manual sorting and recycling technique is to sort the dry batteries, perform a simple mechanical cutting, and manually separate the zinc skin, plastic cover, carbon rod, etc. The remaining Mn02, water manganese stone and other confusions are sent back to the brick kiln for calcination to make dehydrated Mn02. This method is simple and easy, but it takes up a lot of labor and energy, and the economic benefits are not great.

    b．The recovery and utilization technique of the fire method is to sort and break the dry batteries and send them into a rotary kiln. At a high temperature of 1100~1300 degrees Celsius, zinc and zinc chloride are oxidized to zinc oxide and discharged with the flue gas. A cyclone dust collector is used to recover zinc oxide. The remaining manganese dioxide and water manganese stone enter the residue, and then further recover manganese and other substances. This method is simple and easy. Individual smelters do not need to add equipment to recover zinc. 

    c．Wet recycling techniques are based on the principle that zinc and manganese dioxide are soluble in acid. After sorting and crushing the waste dry batteries, they are placed in a leaching tank, and dilute sulfuric acid (100~120g/L) is added for leaching to obtain a zinc sulfate solution. Metal zinc can be obtained by electrolysis. After the filter residue is washed, the copper cap and carbon rod are separated, and the residue Mn02 and water manganese stone are calcined to obtain Mn02.The methods used are roasting-leaching method and direct leaching method.

    Compared with the fire method, the wet method has advantages such as low investment, low cost, fast factory construction speed, high profits, and maneuvering technology, but it cannot guarantee the complete recovery of harmful ingredients.

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