阴极射线管锥玻璃真空碳热还原除铅机理研究

Vacuum Carbonthermic Reduction Analysis for Removing Lead from Cathode Ray Tube Funnel Glass

阴极射线管(cathode ray tube,CRT)玻璃附加值极低,毒性浸出实验表明CRT玻璃为危险废物,是当前我国电子垃圾处理处置中首要的必须解决的难题。废弃CRT玻璃安全处理处置的关键在于其含铅锥玻璃的处理处置。文章从锥玻璃的组成出发,探讨真空碳热还原除铅的可能性及可行性,计算表明真空碳热还原除铅完全可能,实验结果表明900℃,10 Pa下反应4 h铅的去除率可达93.53%,残余物中铅的质量分数仅为0.9%。该法为解决废弃危险电子垃圾CRT玻璃问题提供了新的思路,具有较强的应用价值。

Lead leachability of cathode ray tube（CRT） identifies that CRT is a kind of hazardous waste with extremely low added value, and safe treatment of CRT is listed as priority in electronic waste treatment, with focus on safe disposal of leaded funnel glass. According to the compositions of funnel glass, the possibility and feasibility of lead removal by vacuum carbonthermic reduction was analyzed, and results showed that lead could be removed by vacuum carbonthemic reduction, and lead removal rate was up to 93.53% under the conditions of temperature 900℃, pressure 10 Pa and reaction time 4 h, with mass fraction of lead in the residue as 0.9%. The findings would provide a new concept to safe disposal of hazardous e- waste CRT glass thus has a high application value.