a manual sorting and recycling technology
Generally, once the dry batteries are classified, a simple mechanical cutting is carried out to manually separate the zinc sheets, plastic covers, carbon rods , etc., and the remaining Mn02, hydromanganese stone and other mixtures are returned to the brick kiln for calcining to produce dehydrated MnO2. This method is simple and easy to implement, but it is labor intensive and has little economic benefit.
b. Fire recycling technology
Generally, dry batteries are classified and broken, then sent to a rotary kiln at high temperatures of 1100 to 1300 degrees Celsius, zinc and zinc chloride are oxidized zinc oxide and evacuated through the flue. gas. , use a cyclone dust collector to recover the zinc oxide, and the remaining manganese dioxide and manganite enter the residue, then recollect more manganese and other substances. This method is simple and easy to implement, and ordinary smelters can recover zinc without addition. additional equipment.
c. Wet recycling technology
Based on the principle that zinc and manganese dioxide are soluble in acid, used dry batteries are classified and crushed, then placed in a leaching tank and l Dilute sulfuric acid (100 ~ 120 g/L) is added. Leaching to obtain a zinc sulfate solution, metallic zinc can be obtained by electrolysis. After the filter residue is washed and separated to separate the copper cap and carbon rod, the remaining Mn02 and manganite are calcined to obtain Mn02. The methods used include the roast-leach method and the direct leach method.
Compared to the fire method, the wet method has the advantages of low investmentanoint, low cost, fast factory construction, high profit and flexible process, but it cannot guarantee the complete recovery of harmful ingredients.