标題: Preparation of nickel-cobalt tailings-based cementing materials by mechano-chemical activation: Performance and mechanism

作者: Xiang, YW (Xiang, Yuwei); Lan, JR (Lan, Jirong); Cai, YA (Cai, Yungao); Wang, Y (Wang, Yi); Dong, YQ (Dong, Yiqie); Hou, HB (Hou, Haobo)

來源出版物: CONSTRUCTION AND BUILDING MATERIALS 卷: 408 文獻号: 133836 DOI: 10.1016/j.conbuildmat.2023.133836 出版年: DEC 8 2023

摘要: Currently, the stock of nickel-cobalt tailings (NCT) exceeds 30 million tons, and effective utilization is crucial for addressing environmental pollution. This study focuses on modifying NCT and bottom ash (BA) using the mechanochemical method to create cementitious materials. The research findings indicate that when the cement clinker content is below 3 %, the maximum compressive strength of the specimens can reach 4.803 MPa. After 28 days of curing, the leaching concentrations of nickel and cobalt in the consolidated sample decreased from 5.824 and 1.281 mg/L to 0.803 and 0.179 mg/L, respectively. These levels meet the standard set by China for mine repair and backfilling. The consolidation process primarily involves the recombination of elements such as Si, Ca, and Mg in the amorphous material, resulting in the encapsulation of most ions within the structure and eliminating the risk of contamination. This technology enables the treatment and transformation of NCT and BA waste into cementitious materials suitable for backfilling local mining pits. It holds great potential for various civil environmental applications in fields such as green construction materials.

作者關鍵詞: Bulk solid waste powder; Mechanochemical activation; NCT; Coagulation activity; Heavy metal stabilization

地址: [Xiang, Yuwei; Cai, Yungao; Wang, Yi; Hou, Haobo] Wuhan Univ, Sch Resource & Environm Sci, Wuhan, Peoples R China.

[Lan, Jirong] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China.

[Dong, Yiqie] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan, Peoples R China.

通訊作者地址: Hou, HB (通訊作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan, Peoples R China.

Lan, JR (通訊作者)，Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China.

電子郵件地址: lanjirong3636@126.com; houhb@whu.edu.cn

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