Recycling technology of used batteries

　　For dry batteries, there are three main recycling technologies, which are: manual sorting, fire recycling, and wet recycling.

　　At present, due to strict domestic and international regulations on the mercury content of dry batteries, testing and recycling of lithium batteries are no longer required. However, if too many dry batteries are gathered in one place or the dry batteries do not meet environmental protection indicators, From the perspective of resource reuse, there is still market space for dry battery recycling and utilization. From the perspective of zinc-manganese batteries and alkaline zinc-manganese batteries, the main categories of dry batteries, metals such as mercury, zinc, and cadmium can be recovered from recycling, and the pollution caused by batteries can be completely solved. For dry batteries, there are three main recycling technologies, which are: manual sorting, fire recycling, and wet recycling.　　What are the methods for recycling old batteries

　　1. Manual sorting method: After the dry batteries are classified into carbon batteries and alkaline batteries, they are mechanically dissected, and then the zinc skin, manganese dioxide (requiring further mercury removal), carbon rods, plastic covers, etc. are separated by manual methods , This is a method focusing on comprehensive recycling.

　　2. Fire recovery: After the dry batteries are sorted and broken, they are sent to a high-temperature furnace (1). Zinc and zinc chloride are oxidized into zinc oxide and discharged with smoke. The powder is recovered by a cyclone and further synthesized into zinc oxide products;

　　(2). The remaining manganese dioxide and manganese enter the residue. Depending on the economic value, it can be determined whether to recycle manganese powder. This method mainly focuses on the recovery of zinc.

　　3. Wet recovery: mainly using chemical reactions,

　　(1) Divide the dry battery into carbon and alkaline batteries and then crush them. Place the crushed material in a leaching tank, add 100-120g/L of dilute sulfuric acid for leaching to obtain a zinc sulfate solution, and then obtain metallic zinc by electrolysis;

　　(2) After separating the copper grease and carbon rods, the remaining manganese dioxide residue and manganese are calcined to obtain manganese dioxide. Compared with the above-mentioned manual sorting and fire recovery method, the harmful components recovered and processed by this method are not comprehensive.

　　In fact, the above three methods will still have leftover harmful substances, especially the problem of wet recycling is more serious. For this reason, it is necessary to take into account the prevention of secondary pollution in recycling. The current method is to add some sorting and extraction steps to the above three methods at the same time to extend the recycling process, make the too rough part of the above method more detailed, and try to restore the "original ecology" of the dry battery before it is made. Restore the natural forms of copper, iron, manganese, zinc, etc. In this way, the solution or ash left over during the recovery process is not polluted.