Abstract
Waste cathode ray tube (CRT) funnel glass (FG) is an important part in the disposal of electrical and electronic waste (e-waste). A novel approach for efficient lead extraction and glass-ceramics synthesized from waste FG through collaboratively smelting FG with coal fly ash (CFA) is proposed. Glass-ceramics materials with 40 wt%–80 wt% FG additions were produced under sintering temperatures of 900–1000 °C. The microstructure and phase composition of the produced glass-ceramics were studied using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The density, water absorption, Vicker hardness, chemical resistance and heavy metal leaching characteristics of the glass-ceramics were measured. The experimental results indicate that the samples can be crystallized at sintering temperatures of 900–1000 °C. An elevated sintering temperature is favorable for enhancing the degree of crystallization, while the crystallization process is inhibited at excessively high temperatures. Increasing FG addition can lead to the transformation of the main crystalline phase from diopside to gehlenite. Well-crystallized crystals were generated in the specimens with 50 wt%–70 wt% FG additions. The samples with 40 wt%, 50 wt%, 60 wt%, 70 wt%, 80 wt% FG addition exhibit the optimal chemical and physical properties at 975, 925, 950, 925 and 900 °C, respectively. Overall results demonstrate that this study provides a feasible strategy for reliably detoxifying and reusing waste FG and CFA.
摘要
废弃阴极射线管(CRT)锥玻璃(FG)是电子电气废物(电子废物)处置中的重要组成部分。本文提 出了一种通过锥玻璃与粉煤灰(CFA)协同冶炼从锥玻璃中高效提取铅并制备微晶玻璃的新方法。在FG 加入量40 wt%~80 wt%、烧结温度900~1000 °C 的条件下制备了微晶玻璃材料。通过X 射线衍射(XRD) 和扫描电子显微镜(SEM)研究了微晶玻璃的微观结构和相组成。测量了微晶玻璃的密度、吸水率、维 氏硬度、化学抗性和重金属浸出特性。实验结果表明,样品可以在900~1000 °C 的烧结温度下产生晶 化。较高的烧结温度有利于提高结晶度,但温度过高会抑制析晶。随着FG 添加量的增加,主晶相从 透辉石转变为钠钙石。FG 加入量为50 wt%~70 wt%的样品结晶度较高。FG 加入量为40 wt%、50 wt%、 60 wt%、70 wt%、80 wt%的样品分别在975、925、950、925 和900 °C 下达到最佳的化学和物理性能。 结果表明,本文提出的方法可实现废弃锥玻璃和粉煤灰的无害化及再生利用。
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LYU Jian-fang and YANG Hong-ying provided the concept. LYU Jian-fang conducted the literature review and wrote the first draft of the manuscript. JIN Zhe-nan offered the materials. LYU Jian-fang, JIN Zhe-nan and MA Zhi-yuan carried out experiments, performed data analysis, and contributed to the paper editing. All authors replied to reviewers’ comments and revised the final version.
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LYU Jian-fang, JIN Zhe-nan, MA Zhi-yuan, and YANG Hong-ying declare that they have no conflict of interest.
Foundation item: Project(2020GDASYL-20200103101) supported by the GDAS’ Project of Science and Technology Development, China; Project(2020A1515010729) supported by the Natural Science Foundation of Guangdong Province, China; Project(2018YFC1902004) supported by the National Key R&D Program of China
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Lyu, Jf., Jin, Zn., Ma, Zy. et al. Effect of sintering temperature on microstructure and properties of glass-ceramics synthesized from waste cathode ray tubes funnel glass. J. Cent. South Univ. 28, 2320–2332 (2021). https://doi.org/10.1007/s11771-021-4772-0
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DOI: https://doi.org/10.1007/s11771-021-4772-0