用矿渣和废印刷电路板合成碱活性粘合剂并确定其特性

IF 5.4 Q2 ENGINEERING, ENVIRONMENTAL
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引用次数: 0

摘要

由于技术的进步,预计未来十年全球印刷电路板(PCB)的产量将大幅上升。印刷电路板的生产会产生各种危险废物,其中一种废物是钻孔和其他准备操作过程中产生的非常细小的电路板材料颗粒。将这些废物丢弃到环境中会造成严重后果,需要引起重视。因此,废印刷电路板(WPCB)的回收利用可以减轻其对环境的有害影响,同时还能降低补救成本。在这项研究中,废印刷电路板被用作研磨粒化高炉矿渣(GGBFS)的替代品,用于开发碱活性粘合剂。碱活性粘结剂由 GGBFS、WPCB、氢氧化钠溶液(NaOH)和硅酸钠合成。(NaOH) 和硅酸钠溶液 (Na2SiO3) 合成碱活性粘结剂。(Na2SiO3)。用 WPCB 取代 GGBFS,取代率分别为 0%、10%、20% 和 30%(按体积计算)。此外,还研究了不同浓度的 NaOH 和 Na2SiO3 对粘合剂物理和机械性能的影响。对所开发的粘结剂的施工性、强度、吸水性和风化性能进行了评估。此外,为了确定其对环境的安全性,还进行了毒性特征浸出程序(TCLP)测试。结果表明,就粒度分布而言,木塑复合板的特性与 GGBFS 是兼容的。此外,用不超过 20% 的 WPCB 替代 GGBFS 可为碱激活粘结剂提供理想的特性。不过,不建议使用更高的替代物,因为这会对粘结剂的机械性能产生不利影响。研究表明,使用 8 M NaOH 和 Na2SiO3 与 NaOH 之比为 2 的粘结剂,以及用全木塑砂浆取代高达 20% 的 GGBFS,可以获得理想的性能。TCLP 测试结果表明,使用了木塑包的碱活化粘合剂产生的浸出液中的污染物均在规定范围内,不会对环境造成任何威胁。最后,本研究成果为地基、建筑、桥梁、人行道等各种建筑应用领域的环保型粘结剂配方提供了一种创新方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Synthesis and characterization of alkali-activated binders with slag and waste printed circuit board

Synthesis and characterization of alkali-activated binders with slag and waste printed circuit board

The global production of printed circuit board (PCB) is expected to rise substantially in the next decade due to the advancement in technology. The production of PCB results in generation of hazardous waste of various kinds, and one such waste is the very fine particles of the board material that is generated due to drilling and other preparatory operations. The disposal of such waste in the environment can result in serious consequences which needs attention. Therefore, recycling of waste printed circuit board (WPCB) can mitigate its harmful effects on the environment and also reduce the remediation costs. In this study, the WPCB is used as a substitute to ground granulated blast furnace slag (GGBFS) in development of alkali-activated binder. Alkali-activated binder was synthesized with GGBFS, WPCB, sodium hydroxide sol. (NaOH), and sodium silicate sol. (Na2SiO3). GGBFS was replaced with WPCB at replacement rates of 0%, 10%, 20%, and 30% by volume. Additionally, the effect of varying concentration of NaOH and Na2SiO3 on the physical and mechanical performance of the binder was studied. The developed binders were evaluated for workability, strength, water absorption, and efflorescence properties. Further, to ascertain its safety on the environment, the toxicity characteristic leaching procedure (TCLP) test was also performed. The results indicate that WPCB characteristics are compatible with GGBFS in terms of its particle size distribution. Moreover, the replacement of GGBFS with up to 20% WPCB provides desirable properties for the alkali-activated binder. However, higher replacements are not recommended, since it had detrimental effect on the mechanical performance of the binder. The study revealed that desirable performance can be achieved for binders with 8 M NaOH and with Na2SiO3 to NaOH ratio of 2, and up to 20% GGBFS replaced with WPCB. The results of TCLP test disclose that the contaminant in the leachate from alkali-activated binders with WPCB are within regulatory limits, and do not pose any threat to the environment. Finally, the outcome of this study provides an innovative approach towards formulation of eco-friendly binder for various construction applications such as foundations, buildings, bridges, pavements, etc.

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来源期刊
Journal of hazardous materials advances
Journal of hazardous materials advances Environmental Engineering
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