| 摘要 |
Method for recycling used lead acid Batteries electrolytic solution, especially the automotive batteries, has the following stages: the sulfuric acid solution derived from the cutting of batteries goes through a drying bed (quick filters) which is composed of a layer of crushed rocks, "bidim" and sand or through a press filter for the retaining of the solid particles, after the solution goes through these filters, it goes through to a reactor where it suffers a forced decantation process for retaining the heavy metals and contaminants; the forced decantation process is carried out by adding 20 liters of aluminum dioxide, 20 kilos of lime (in the form of milk of lime), 2 liters of aluminum polychloride (flocculent) and 200 grams of acrylic acid acrylamide (polymer, used diluted in water) to every 10,000 liters of sulfuric acid under shaking, it is then left at rest for 40 minutes for decantation, soon after decantation the floating part goes through a bag filter with a polyethylene sheet filter and then through a 5-micre cartridge filter, then it is sent to a reservoir and it is stored; the decanted part is sent to the drying beds for retaining the flocculent materials and the percolated one goes to the reprocessing method as described above; when reaching the storage tanks, the solution has low levels of lead, between 3ppm and 5ppm. In order to assure a greater safety of the process during the loading of the containers that will carry the recycled product, the solution goes through polyester filters for being sent to the other companies as raw material. |
