The results show that:
the new technology not only can reduce the waste batteries’ environment
pollution, but also can achieve the resource utilization of waste batteries,
manganese recovery rate can up to more than 96%.

China is a
producing country and a major exporter of disposable zinc-manganese batteries,
but also a large consumption country. According to statistics, in 2001, China’s
disposable battery production reached 17.5 billions, Chinese battery
consumption is about 8 billion, of which about 70% are disposable
zinc-manganese batteries. Metal powder suppliers estimated that produce every 1 billion manganese batteries will
consume 16,000t zinc metal, 2.3 million tons MnO2, 208t copper block, 2700t
zinc chloride, 4300t carbon rods, 7900t ammonium chloride. Waste battery, its
main ingredient zinc, manganese, carbon rods, copper still exist in it, assumed
that China’s battery consumption can reach 50% of the recovery, then every year
can recycle 60,000t zinc metal, 80,000t manganese, 800t copper from the waste
batteries, also can be recycled carbon rods, ammonium chloride. Conversely, if not
recycling and processing the battery, not only the manganese, zinc and other
industrial raw materials in waste batteries can not be recovered and utilized, but
also a large number of waste batteries with household waste buried in the
ground will cause heavy metal contamination to soil and groundwater. Relevant
data show that a No. 1 battery rot in the ground can make a square meter of
soil permanent loss of use value; a button battery can contaminate 600t water,
equivalent to the water consumption of one’s life. Therefore, recycling of
waste batteries has a very important practical significance. With China’s
economic development and social progress, people’s awareness of environmental
protection and resource awareness increasingly growing, in recent years, more
and more researches about waste battery recycling methods, this paper for the
purpose of recycling, using the manganese in waste batteries, through analysis,
research waste batteries ingredients and the recycling method of manganese,
come up with the new method of using oxalic acid as a reducing agent, reducing
manganese compounds in battery materials to recycle the manganese in waste
batteries and get high purity manganese sulfate.

The composition of the waste zinc-manganese
batteries, various types of waste manganese dry battery composition comprising:
zinc, manganese powder, acetylene black, ammonium chloride, electrically paste, asphalt,
plastics, copper cap, steel, paper, MnOOH. In waste batteries, the manganese powder
is 65 % or so, we can see it is very important that whether manganese is
reasonable and effective treating in battery recycling process.

A method is cutting, sorting the waste zinc-manganese batteries and obtained
manganese black powder mixture, after firing in a tubular furnace, stirred with
1.25mol/L of hot sulfuric acid leach 2h, add the sodium hypochlorite, and then
filtering, washing, drying the obtained precipitate and get the MnO2. Although
this process is relatively simple, but the purity of the product is low and
introduce new ions, easy to cause secondary pollution to the environment.

Another way is cutting, sorting the waste
zinc-manganese batteries, the obtain black manganese powder mixture through
watering, filtering, roasting, and then leaching, filtered, dried and mixed
with a certain proportion of potassium chlorate and potassium hydroxide react in
pillow melting state, obtained potassium permanganate after proper handling.
The method is less complicated processBusiness Management Articles, but it is not difficult to see that: to
obtain relatively pure potassium permanganate needed further processing.

Source:http://www.mhcmp.com

Leave a Comment