Direct carbonation of magnesium slag after salt lake lithium extraction for use as a cementitious material

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

Construction and Building Materials Pub Date : 2025-03-07 DOI:10.1016/j.conbuildmat.2025.140545

Zhen Li , Ying Hua , Zhichao Zhang , Yongbo Huang , Pengyu Zhang , Jueshi Qian

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引用次数: 0

Abstract

Carbonation of MgO and Mg(OH)₂ for the preparation of cementitious materials has attracted much attention due to the rapid strength gain and high CO₂ sequestration. This paper investigated the potential use of lithium extraction by-product magnesium slag from salt lake as MgO and Mg(OH)₂ sources to prepare construction material through carbonation. Calcium hydroxide and dipotassium hydrogen phosphate were used to promote the hardening and carbonation of magnesium slag. Properties of magnesium slag moulded by casting and compacting under 100 % CO₂ and 0.1 MPa pressure condition were compared and the phase changes were also analyzed. Results indicated that the cast moulding magnesium slag yielded uniform carbonation of the specimen, resulting in 1 h strength of 20 MPa. Compacted magnesium slag leads to the uneven carbonation but continuous strength development due to the internal moisture. Brucite in magnesium slag was the main reactant while hydromagnesite and amorphous hydrated magnesium carbonates were confirmed as the main carbonation products by combining XRD, FTIR, TGA analysis. In addition, K₂HPO₄ promoted the carbonation of Mg(OH)₂, leading to the uniform carbonation of specimens and increased 8 h strength to 49.4 MPa. This study builds foundation for use carbonation of Mg-based solid wastes as construction materials.

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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.