dry battery The manganese recovery method research of waste zinc-manganese batteries

In this paper, the recycling process of manganese in waste zinc is compared.On this basis, a new technology is proposed for manganese batteries, that is, to reduce manganese compounds in waste zinc by taking grass as reducing agentRecovery of manganese batteries and waste zinc-Manganese batteries are manganese.The results show that the new technology can not only reduce the environmental pollution of waste batteries, but also realize the resource utilization of waste batteries.
\ rmn recovery rate can reach more than 96%.China is a major producer and exporter of disposable zincIt is also a manganese battery in a consuming country.According to statistics, the output of disposable batteries in China reached 17 in 2001.
The consumption of batteries in China is about 8 billion, of which the consumption of disposable batteries is about 70%.Manganese batteries.The metal powder supplier that produces 1 billion manganese batteries will consume 16,000 tons of zinc metal, 2.3 million tons of manganese, 208 tons of copper, 2700 t of zinc chloride, 4300 t of carbon rod and 7900 t of ammonium chloride.
Waste batteries, the main components of which are zinc, manganese, carbon rods, copper, still exist, assuming that China's battery consumption can reach 50% of the recycling, then 60,000 tons of zinc metal, 80,000 tons of manganese and 800 tons of copper are recovered from waste batteries every year, and carbon rods and ammonium chloride can also be recovered.On the contrary, if the battery is not recycled and treated, not only can manganese, zinc and other industrial raw materials in the waste battery not be recovered and utilized,, A large amount of waste batteries and domestic garbage buried underground can also cause heavy metal pollution to soil and groundwater.Related data display,1 The Battery rot on the ground, which can permanently lose the use value of the soil of the square meter;Button batteries can pollute 600 t of water, which is a necessary condition for a person to use water for a lifetime.
Therefore, the recycling of waste batteries is of great practical significance.With the development of China's economy and the progress of society, people's awareness of environmental protection and resource awareness is increasing. in recent years, more and more research on waste battery recycling methods is carried out.
This paper aims to use manganese in waste batteries for recycling, through the analysis, the composition of waste batteries and the recovery method of manganese are studied, and a new method with grass acid as reducing agent is proposed to reduce manganese compounds in battery materials and recover manganese in waste batteries, obtain high purity manganese sulfate.Composition of waste zinc-Manganese batteries, composition of various types of waste manganese dry batteries, including: zinc, manganese powder, ethylene-propylene Black, ammonium, slurry, asphalt, plastic, copper cap, steel, paper, MnOOH.In the waste battery, manganese powder is about 65%, we can see that it is very important to treat manganese reasonably and effectively during the battery recovery process.
One way is to cut the waste zincManganese battery and the obtained \ rmn black powder mixture, stir with \ r1 after firing in a tube furnace.After 2 h of hot sulfuric acid leaching of 25 mol/L, hypochlorite sodium was added, and then precipitated by filtration, washing and drying to obtain m2.Although this process is relatively simple, the purity of the product is low, and the introduction of new ions is easy to cause secondary pollution to the environment.
Another way is to cut, classify wasteManganese batteries, by watering, filtering, baking, then filtering, filtering, obtain a mixture of black manganese powder, mix with a certain proportion of potassium chloride and koh after drying, react in the melting State of the pillow, potassium permanganate was obtained after proper treatment.The process of this method is not complicated, but it is not difficult to see that further treatment is needed to obtain relatively pure potassium permanganate