As we all know, China is a big country in battery production and consumption. While producing and using dry batteries in large quantities, there are also a large number of used dry batteries.Button batteryIt will inevitably occur. If dry batteries are not handled properly, it will cause environmental pollution and waste of resources. The current treatment of used batteries mainly includes harmless landfill and comprehensive utilization:

Harmless landfill technology is usually applied to used dry batteries containing mercury and lead. The specific method is to put the used dry batteries into a special container and put it into a landfill with a double-layer HPDE anti-seepage membrane. This method is simple , convenient, but requires high impermeability.

The comprehensive utilization technology of used dry batteries mainly includes hydrometallurgy and pyrometallurgy technology. Hydrometallurgy has two treatment processes: roasting leaching method and direct leaching method. Its basic principle is based on the principle of dissolving in acids, such as zinc, manganese 2 oxide, etc. Etc., so in zinc-manganese batteries, zinc and manganese 2 oxide react with gel to generate soluble salts and solutions. After purification of the solution, metallic zinc and manganese 2 oxide electrodes are generated.

Pyrolytic metallurgy technology is divided into atmospheric pressure metallurgy technology and vacuum metallurgy technology. The principle is the process of oxidation, reduction, decomposition, volatilization and condensation of metals and their compounds in waste dry batteries at high temperatures. All work of atmospheric metallurgy is performed in the atmosphere Carried out in the same process as hydrometallurgy, atmospheric metallurgy The process also has the characteristics of long process, heavy pollution, large energy consumption, and high production cost. The vacuum method is based on the composition of used dry battery components that have different steam pressures at the same temperature. They pass steam and condensation in a vacuum to make them at different temperatures. It is separated at high temperature to achieve comprehensive utilization of technology.

In addition, some battery manufacturers use physical separation methods, that is, chemical purification technology. It is reported that physical separation can recover 82.50 percent of the useful components in used dry batteries, which can be used as final products and intermediate products.