| 英文摘要 |
Lead-acid battery possesses the advantages of high capacity, safety, stability and low cost. A large number of lead-acid batteries are applied in mobile battery, electrical forklift or other electrical machines and industrial uninterruptible power supply, etc. Materials of spent lead-acid battery are recycled in the lead-acid battery recycle industry. The spent lead-acid battery is divided into lead and plastics in the physical decomposition process. A large amount of water is used to wash the decomposed parts in the process. However, the processed water, containing 2 mg/L to 20 mg/L lead, can’t be reused. The lead in the processed water also can’t be recovered, too. As the result, the alkali and the metal gathering chemicals are added to remove lead from processed water traditionally. Treated water with lead concentration below the effluent control scale is discharged. The waste lead becomes heveay metal sludge. The sludge, which is the secondary pollutant, is not able to be reused and the treatment cost gets higher and higher. Therefore, the reduction of processed water waste and the recycling of water resources in the lead-acid battery’s recycling process have become an important issue for our company.
By searching the heavy metal water treatment technology and the related literatures, we found out that the LCD glass adsorbent from the colaberation research of EPA and ITRI exhibits exellent adsorption behavior of lead metal ions. The material can be applied on the innovative heavy metal processed water treatment technology that is different from the traditional chemical coagulation method. We expect to use this technology to deal with the lead-containing processed water in the lead-acid battery recycling process of our company. In addition to reusing the processed water, which the lead metal ions are removed, in our decomposition process, the lead materials obtained through the saturated absorbent desorption process will be evaluated to produce lead ingot products in our smelting process. In this project, the construction of water cycle treatment system for lead-acid battery recycling process using the LCD glass nano porous absorbent is proposed. A systematic evaluation process is also proposed for the follow purpose: (1) Recycle water resource from lead-containing processed water through the adsorption system. (2) Recover lead resource from the processed absorbent. (3) Decrease the alkali usage. (4) Decrease the heveay metal sludge. We expect that based on this project, we can evaluate and promote the green cycle and resource regeneration of the lead-acid battery recycling process. We believe that this application will make the development of lead-acid battery recycling industry more environmentally friendly.
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