耐酸纳滤膜回收再生废铅蓄电池中电解液的研究OA

To address the challenge of recycling electrolyte from waste lead-acid batteries,acid-resistant nanofiltra-tion membrane separation is used to achieve resource recovery.Through microfiltration pretreatment(0.22 μm),suspended matter such as PbSO4 and PbO2 in the waste electrolyte is effectively removed,laying the foundation for subsequent nanofiltration.The acid-resistant nanofiltration membrane(150～250 Da)jointly developed in this paper was used to investigate the membrane performances on the recovery rate of sulfuric acid and the removal rate of heavy metal ions.The results show that when the concentration ratio(permeate/concentrate)is increased from 1 to 4,the recovery rate reaches more than 80%with a feed concentration of 5 wt%sulfuric acid.The removal rates of i-ron,lead,copper,and manganese ions were stable at more than 93%at a concentration ratio of 3 and an operating pressure of 2 500 kPa.Under 15 wt%sulfuric acid feed and 2 500 kPa operating pressure,after 300 hours of conti-nuous operation,the membrane flux was maintained at 80 L·m-2·h-1,and the heavy metal rejection rate did not decay.The overall performance was very close to that of international leading commercial membrane,which can a-chieve domestic substitution of similar products and have price advantages.This process significantly reduces the pollution and energy consumption of traditional methods for treating electrolytes,providing technical support and process reference for the green recycling and reuse of waste electrolytes.