Recovery and treatment method of zinc-manganese dry battery

Random disposal of used batteries will cause serious environmental pollution and waste of resources. As a movable energy storage device, the battery is a very expensive energy storage device. Once the heavy metals and other substances contained in the battery enter the soil and water in the environment, they will cause varying degrees of harm to the human body. In short, if there is a suitable treatment method, these heavy metals have great recovery value. In order to carry out environmental protection undertakings and rationally recycle batteries, the treatment of waste batteries can be done in two ways: curing deep burying and recycling, and knowing them in detail. Battery recovery method Zinc-manganese dry battery treatment 1. The method of hydrometallurgy is based on the principle that Zn and MnO2 are dissolved in acid. Zn and MnO2 in the battery combine to form a soluble salt under the use of acid and enter the solution. After the solution is purified, electrolysis is used to process metallic zinc and electrolytic manganese dioxide or other chemical products and fertilizers. Hydrometallurgy is divided into calcined leaching and direct leaching. The roasting and leaching method is a waste of battery roasting, so that ammonium chloride and mercurous chloride evaporate into the gas phase separation and recovery condensing equipment, metal oxides are oxidized and transformed into low and high, and the calcined product is acid leached, and then the metal is recovered from the leachate. In the electrolysis process, the first reaction of the attack is: MeO+C-我+The company writes a (s)-(g) writes a leaching process during the baking process.The first reaction: Me+2H+→Me2++H2↑MeO In the process of +2H+→Me2++H2O electrolysis, the primary reaction of the cathode is: Me2++2e→Me direct leaching method is to crush, sieving, and washing waste dry batteries, and directly acid leaching metal components such as zinc and manganese. After filtering, Filtrate purification, metal extraction and processing chemical products. The equation is: summary+4hcl→MnCl2Cl2+↑+2h2omno2 hydrochloric acid+2→MnCl2Cl2+H2OMn2O3+6hcl→2MnCl2+↑+3h2omncl2+sodium hydroxide→Mn(OH)2+2naclmn(OH)2+oxidant→summary↓+2 in the hydrochloric acid battery The zinc is recovered by the ZnO method, and the reaction formula is as follows: Zn2++2OH-→ZnO2-→Zn(OH)2 (amorphous colloid)→ZnO (crystal)+H2O2. Metal and its compounds in waste batteries under high temperature atmospheric metallurgy Oxidation, recovery, decomposition, evaporation and condensation process. Method 1: Heat the used dry battery at low temperature, first evaporate mercury, and then recover heavy metals such as zinc at high temperature. Method 2: First, in high-temperature calcination, the easily vaporized metal and its oxide are evaporated, and the residue is used as a metallurgical center product or other treatments. Hydrometallurgy and atmospheric gold method are relatively outdated in technology, but they have long process, many pollution sources, high investment and cost, and low induction benefit. In 1996, TDK of Japan made a bold change in the regeneration process and resumed the recovery of single-metal magnetic data. The method simplifies the separation process, greatly reduces the cost, and thereby greatly improves the regeneration efficiency of the dry battery. In recent years, a new metallurgical method, vacuum metallurgy, development is based on preliminary inspection and research: according to the waste of battery packs at the same temperature, different vapor pressures, after vacuum evaporation and condensation, so their separation is independent of each other at different temperatures , And then complete induction and recovery. Since it is carried out in a vacuum, the atmosphere is not involved in the operation, so pollution is reduced. Although there are few researches on vacuum metallurgy and no corresponding economic indicators, it overcomes some of the shortcomings of hydrometallurgy and atmospheric metallurgy and is a very promising method. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Analysis of the characteristics of lithium batteries