Precalcination-modified lead-zinc tailings for supersulfated cement production: Insights into phase assemblages, microstructure, and mechanical properties

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-03-31 DOI:10.1016/j.conbuildmat.2025.141076

Zhongtao Luo , Mengxiao Ge , Jiahui Ou , Xiaohai Liu , Yuandong Mu , Wensheng Zhang , Jiayuan Ye , Maoliang Zhang , Mingkang Gao , Yifan Yang , Xinhong Liu , Lei Liu

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引用次数: 0

Abstract

Lead-zinc tailings (LZTs), a byproduct of lead-zinc ore beneficiation, present significant environmental challenges due to their large volume and heavy metal content. This study investigated the potential of LZTs as an activator for granulated blast furnace slag (GBFS) in the preparation of supersulfated cement (SSC) through precalcination at varying temperatures. The effects of precalcination on the composition and structural characteristics of LZTs were analyzed using XRD, TGA, and SEM. The hydration behavior and microstructure of the resulting SSC were characterized by XRD, TGA, SEM, and MIP. The results indicated that precalcination of LZTs transformed pyrite and dolomite into Fe₂O₃, CaO, MgO, and CaSO₄, with maximum CaSO₄ levels achieved at 800 ℃. The resulting CaSO₄ and basic oxides served as sulfate and alkaline activators for SSC. Compressive strength tests demonstrated that GBFS was effectively activated by LZTs precalcined at temperatures between 500 and 1000 ℃ for 1 hour. SSC paste samples with a precalcined-LZTs/GBFS ratio of 2:8 achieved optimal strength exceeding 25 MPa after 90 d. The primary hydration products were AFt and C-S-H gel, which interwove to densify the microstructure of the hardened slurry.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.