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Combined Fe2O3 and CaCO3 Additives To Enhance the Immobilization of Pb in Cathode Ray Tube Funnel Glass
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1021/acssuschemeng.7b03979 Ying Zhou 1 , Changzhong Liao 1, 2 , Kaimin Shih 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1021/acssuschemeng.7b03979 Ying Zhou 1 , Changzhong Liao 1, 2 , Kaimin Shih 1
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Cathode ray tube (CRT) funnel glass has posed an increasing threat to the environment due to its rapid replacement by new technology in recent years. In this study, a well-control thermal scheme was applied for synthesizing a specific crystalline phase, PbFe12O19, for Pb immobilization when reusing CRT funnel glass as raw materials for the ceramics industry. The Fourier transform infrared spectroscopy results show that introduction of CaCO3 facilitated the breakage of strongly connected bonds between O–Si–O and Pb–O, which were firmly linked in the glass network. The X-ray diffraction results demonstrate that 30 wt % CaCO3 loading effectively facilitated the transformation of Pb in CRT funnel glass to the stable-phase PbFe12O19. A higher sintering temperature increased Pb transformation efficiency while a longer dwelling time only showed a slight increase in PbFe12O19 formation. The prolonged toxic characteristic leaching procedure results show a substantial improvement in the acid resistance (approximately 2 mg/L) of the thermally treated product with 30 wt % CaCO3 loading and sintering under 1000 °C for 5 h compared to the original CRT funnel glass (500 mg/L). The results of this study demonstrate that incorporation of CaCO3 and Fe2O3 into CRT funnel glass can effectively promote Pb immobilization and provide a new strategy for stabilizing waste CRT funnel glass.
中文翻译：
结合使用Fe 2 O 3和CaCO 3添加剂可增强阴极射线管漏斗玻璃中铅的固定化
阴极射线管（CRT）漏斗玻璃由于近年来被新技术迅速替代而对环境构成了越来越大的威胁。在这项研究中，当将CRT漏斗玻璃用作陶瓷行业的原料时，采用了良好控制的热方案来合成特定的晶相PbFe 12 O 19，以固定Pb。傅里叶变换红外光谱的结果表明，CaCO 3的引入促进了O–Si–O和Pb–O之间牢固连接的键的断裂，这些键在玻璃网络中牢固连接。X射线衍射结果表明30％的CaCO 3负载有效地促进了CRT漏斗玻璃中的Pb向稳定相PbFe的转变。12 O 19。较高的烧结温度提高了Pb的转化效率，而更长的停留时间仅表明PbFe 12 O 19的形成略有增加。延长的毒性特征浸出过程结果表明，与原始CRT漏斗玻璃相比，具有30 wt％CaCO 3负载并在1000°C下烧结5 h的热处理产品的耐酸性（大约2 mg / L）有了实质性的改善（500毫克/升）。这项研究的结果表明，CaCO 3和Fe 2 O 3的掺入 进入CRT漏斗玻璃可以有效地促进Pb的固定化，并为稳定废CRT漏斗玻璃提供了新的策略。
更新日期：2018-01-19
中文翻译：
结合使用Fe 2 O 3和CaCO 3添加剂可增强阴极射线管漏斗玻璃中铅的固定化
阴极射线管（CRT）漏斗玻璃由于近年来被新技术迅速替代而对环境构成了越来越大的威胁。在这项研究中，当将CRT漏斗玻璃用作陶瓷行业的原料时，采用了良好控制的热方案来合成特定的晶相PbFe 12 O 19，以固定Pb。傅里叶变换红外光谱的结果表明，CaCO 3的引入促进了O–Si–O和Pb–O之间牢固连接的键的断裂，这些键在玻璃网络中牢固连接。X射线衍射结果表明30％的CaCO 3负载有效地促进了CRT漏斗玻璃中的Pb向稳定相PbFe的转变。12 O 19。较高的烧结温度提高了Pb的转化效率，而更长的停留时间仅表明PbFe 12 O 19的形成略有增加。延长的毒性特征浸出过程结果表明，与原始CRT漏斗玻璃相比，具有30 wt％CaCO 3负载并在1000°C下烧结5 h的热处理产品的耐酸性（大约2 mg / L）有了实质性的改善（500毫克/升）。这项研究的结果表明，CaCO 3和Fe 2 O 3的掺入 进入CRT漏斗玻璃可以有效地促进Pb的固定化，并为稳定废CRT漏斗玻璃提供了新的策略。
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