Department of Civil Engineering, The University of Hong Kong , Pokfulam Road, Hong Kong, Hong Kong SAR, China.
Environ Sci Technol. 2013 Sep 3;47(17):9972-8. doi: 10.1021/es401674d. Epub 2013 Aug 20.
A novel and effective process of thermal reduction treatment with the addition of metallic iron (Fe(0)) to recover lead from cathode ray tube (CRT) funnel glass is introduced. The key technological breakthrough of this process is the use of a relatively lower temperature and an inexpensive reducing agent to extract the metallic lead. The influences of temperature, the reducing agent content, and the holding time for lead reduction were examined to determine the optimal extraction efficiency. The lead extraction efficiency first increased and then decreased with increasing temperature. The maximum lead extraction efficiency occurred at 700 °C. The growth of crystalline lead first increased significantly with an increase in the Fe content, reaching maximum growth at an Fe addition of 50 wt %. The most effective treatment time was determined to be 30 min, as the vitrification of lead back to the glass matrix occurred under longer treatment times. The experimentally derived results indicate that a 58 wt % lead extraction can be achieved with the optimized operational parameters (50 wt % Fe addition, heating at 700 °C for 30 min) in a single extraction operation.
介绍了一种在添加金属铁（Fe(0)）的情况下，通过热还原处理从阴极射线管（CRT）漏斗玻璃中回收铅的新颖而有效的工艺。该工艺的关键技术突破在于使用相对较低的温度和廉价的还原剂来提取金属铅。考察了温度、还原剂含量和铅还原的保温时间对最佳提取效率的影响。铅的提取效率先增加后降低。在 700°C 时，铅的提取效率达到最大。随着 Fe 含量的增加，晶态铅的生长先显著增加，在添加 50wt%Fe 时达到最大生长。最有效的处理时间被确定为 30 分钟，因为在较长的处理时间下，铅会重新玻璃化到玻璃基质中。实验得出的结果表明，在单一提取操作中，通过优化的操作参数（50wt%Fe 加入量，在 700°C 加热 30 分钟），可以实现 58wt%的铅提取。
