CNTs增强铜尾矿粉地质聚合物的水化微观机理研究

Study on the micro-mechanism of hydration of copper tailings powder with CNTs as a geopolymer

摘要

当代建筑材料领域，绿色化、高性能化的发展理念愈发显著。用固废替代水泥，是变废为宝，绿色资源化应用的有效途径之一。本项目研究利用固体废弃物—铜尾矿粉代替45%的水泥制备复合胶凝材料。为了达到预期的性能标准，采用脱硫石膏（DG）化学激发、以阿拉伯胶分散剂（AG）分散羟基改性的多壁碳纳米管(MWCNTs)，配制增强材料来制备环境友好型铜尾矿基水泥复合材料(CTC)。并对CTC胶凝体系进行力学性能和SEM形貌测试，以及对CTC胶凝体系的晶相进行XRD测试，探究MWCNTs在铜尾矿粉-水泥胶凝体系中的增强机理。这有助于实现铜尾矿固废的资源化利用，为开发高性能地质聚合物提供理论依据和技术支持，有利于推动建筑材料行业朝着绿色、可持续的方向发展。

Abstract

In the field of contemporary building materials, the development concepts of greening and high-performance are becoming increasingly prominent. Replacing cement with solid waste is one of the effective approaches to transform waste into treasure and achieve green resource utilization. This project investigates the use of solid waste—copper tailings powder—to replace 45% of cement in the preparation of composite cementitious materials. To meet the expected performance standards, chemical activation of desulfurization gypsum (DG) and dispersion of hydroxyl-modified multi-walled carbon nanotubes (MWCNTs) with gum arabic (AG) were employed to formulate an environmentally friendly copper tailings-based cement composite material (CTC). The mechanical properties and SEM morphology of the CTC gel system were tested, and XRD analysis of its crystalline phases was conducted to explore the reinforcement mechanism of MWCNTs in the copper tailings-cement gel system. This research contributes to the resource utilization of copper tailings solid waste, provides theoretical basis and technical support for developing high-performance geopolymer, and facilitates the advancement of the building materials industry toward green and sustainable development.

关键词

铜尾矿 / MWCNTs / 氧化石墨烯 / 固体废物

Key words

copper tailings / MWCNTs / graphene oxide / solid waste

参考文献

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基金资助

江西省教育厅科技项目(GJJ2402506)

江西科技学院校级自然项目(23ZRZD02)

江西科技学院校级自然项目(ZR2109)