The carbon mineralization behavior of copper slag and its impact on pozzolanic reactivity

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2024-12-16 DOI:10.1016/j.cemconcomp.2024.105899

Yingbin Wang , Xinhao Li , Wenjuan Miao , Ying Su , Xingyang He , Bohumir Strnadel

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引用次数: 0

Abstract

The massive discharge of copper slag (CS) has led to serious environmental problems. Carbon mineralization, as a treatment method of solid waste, not only achieves carbon sequestration, but also enhances the pozzolanic activity. In this work, a novel exfoliation aqueous carbonation method combining aqueous carbon mineralization and wet grinding was proposed to evaluate the carbon mineralization behavior of CS at mild temperature and pressure. The results indicated that exfoliation aqueous carbonation exhibited higher mineralization degree than that of classical CO₂ bubbling carbonation. The carbonation products of CS were mainly composed of amorphous carbonate and silica. Elevated carbonation temperature could promote the dissolution of fayalite in CS to enhance the carbon mineralization degree. Carbon mineralization treatment could improve the pozzolanic reactivity of CS and the 28 d strength activity index could reach up to 106.3 %. The outcomes could help provide new technology to facilitate the resource utilization of CS.

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铜渣中的碳矿化行为及其对泡沫砂浆反应性的影响

铜渣（CS）的大量排放导致了严重的环境问题。碳矿化作为固体废弃物的一种处理方法，不仅可以实现碳固存，还能提高泡沫活性。本研究提出了一种结合水溶液碳矿化和湿法研磨的新型剥离水溶液碳矿化方法，以评估 CS 在温和的温度和压力下的碳矿化行为。结果表明，与传统的二氧化碳鼓泡碳化法相比，剥离水溶液碳化法具有更高的矿化度。CS 的碳化产物主要由无定形碳酸盐和二氧化硅组成。碳化温度的升高可促进辉绿岩在 CS 中的溶解，从而提高碳矿化度。碳矿化处理可提高 CS 的水胶活性，28 d 强度活性指数可达 106.3%。这些成果有助于为 CS 的资源化利用提供新技术。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.