School of Resource and Environmental Engineering, Shanghai Polytechnic University, Shanghai 201209, China.
Macau Environmental Research Institute, Macau University of Science and Technology, Macau.
Waste Manag. 2023 Dec 1;172:43-50. doi: 10.1016/j.wasman.2023.09.008. Epub 2023 Sep 13.
The safe disposal of waste cathode ray tubes (CRTs) has always been a serious problem due to the stable microstructure of toxic lead (Pb) located in glass. Thousands of researches have been trying to explore environmental and efficient ways to dispose of waste CRTs. To recycle lead from waste CRT funnel glass effectively, a mechanochemical reduction method has been developed in this research. Aluminum was used as a reductant, and the hydrochloric acid solution was used in the leaching process to separate lead from the solution. After mechanochemical ball milling with aluminum, lead ion in CRT funnel glass was transferred into nano-sized element lead. Lead recovery from CRT funnel glass increased significantly as compared to non-activated leaded glass. Approximately 40 % of lead was leached after mechanical activation without aluminum, while over 96 % of lead in the CRT funnel glass could be recovered after mechanochemical reduction with aluminum. Lead chloride (PbCl) can be recycled from the leaching solution after cooling crystallization. Nano-sized Pb formation and the structural changes of leaded CRT funnel glass by mechanochemical reduction process contributed to obvious improvement in lead recovery. This research provided a high-efficiency and feasible approach for recovering lead in form of PbCl crystal from leaded glass.
安全处理废阴极射线管（CRT）一直是一个严重的问题，因为位于玻璃中的有毒铅（Pb）具有稳定的微观结构。数千项研究一直在探索环境友好且高效的方法来处理废 CRT。为了有效地从废 CRT 漏斗玻璃中回收铅，本研究开发了一种机械化学还原法。使用铝作为还原剂，盐酸溶液用于浸出过程，以将铅从溶液中分离出来。在与铝进行机械化学球磨后，CRT 漏斗玻璃中的铅离子被转化为纳米级元素铅。与非活性含铅玻璃相比，从 CRT 漏斗玻璃中回收铅的效果显著提高。机械活化后，未经铝处理，约有 40%的铅被浸出，而经过铝的机械化学还原，CRT 漏斗玻璃中的铅有 96%以上可以被回收。冷却结晶后，可从浸出溶液中回收氯化铅（PbCl）。机械化学还原过程中纳米级 Pb 的形成和含铅 CRT 漏斗玻璃的结构变化有助于明显提高铅的回收率。本研究为从含铅玻璃中以 PbCl 晶体的形式回收铅提供了一种高效可行的方法。
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