What are the recycling technologies for used dry batteries?

Date:2020-11-30
Summary:

a. Manual sorting and recycling technology Generally, d […]

a. Manual sorting and recycling technology
Generally, dry batteries are classified and then simply mechanically dissected to manually separate zinc skins, plastic covers, carbon rods, etc., and the remaining mixture of Mn02, manganese, etc. is sent back to the brick kiln for calcination to produce dehydrated Mn02. It is simple and easy to implement, but it takes up more labor and has little economic benefit. To
b. Fire recycling technology
Generally, dry batteries are sorted and crushed, and then sent to a rotary kiln. At a high temperature of 1100 to 1300 degrees Celsius, zinc and zinc chloride are oxidized to zinc oxide and discharged with the flue gas. The zinc oxide is recovered by a cyclone and the remaining two Manganese oxide and manganese enter the residue, and then further recover manganese and other substances. This method is simple and easy to implement. The general smelter can recover zinc without adding equipment. To
c. Wet recycling technology
According to the principle that zinc and manganese dioxide are soluble in acid, the waste alkaline dry batteries are sorted, broken, placed in a leaching tank, and dilute sulfuric acid (100~120g/L) is added for leaching to obtain a zinc sulfate solution. The metal can be prepared by electrolysis. After the zinc and filter residue are washed to separate the copper cap and carbon rod, the remaining Mn02 and manganite are calcined to obtain Mn02. The methods used are roasting-leaching method and direct leaching method. To
Compared with the fire method, the wet method has the advantages of low investment, low cost, fast construction speed, high profit, and flexible process, but it cannot guarantee the complete recovery of harmful components.