标题: Preparation of Cementitious Materials from Mechanochemically Modified Copper Smelting Slag Compounded with High-Aluminum Fly Ash

作者: Sheng, DG (Sheng, Dige); Lan, JR (Lan, Jirong); Du, ZY (Du, Zhengyu); Ma, YT (Ma, Yantao); Zhou, M (Zhou, Min); Hou, HB (Hou, Haobo)

来源出版物: MATERIALS  卷: 17  期: 3  文献号: 546  DOI: 10.3390/ma17030546  出版年: FEB 2024  

摘要: Copper smelting slag discharged from mining and high-aluminum fly ash generated during the combustion of coal for energy production are two typical bulk solid wastes, which are necessary to carry out harmless and resourceful treatment. This research proposed an eco-friendly and economical method for the co-consumption of copper smelting slag and high-aluminum fly ash. Cementitious materials were compounded with copper smelting slag and high-aluminum fly ash as the main materials were successfully prepared, with a 28-d compressive strength up to 31.22 MPa, and the heavy metal leaching toxicity was below the limits of the relevant standards. The optimum mechanical properties of the cementitious materials were obtained by altering the material proportion, ball mill rotation speed, and CaO dosage. Under the combined effect of mechanical ball milling at a suitable speed and chemical activation with a certain alkali concentration, the prepared cementitious materials had an initial activation. The pastes of the cementitious materials generated a gel system during the subsequent hydration process. The two steps together improved the mechanical strength of the cured products. The preparation was simple to operate and offered a high stability of heavy metals. The heavy metal contaminants were kept at a low content throughout the process from raw materials to the prepared cured specimens, which was suitable for application in practical environmental remediation projects and could provide effective solutions for ecological environment construction.

作者关键词: copper smelting slag; high-aluminum fly ash; mechanical activate; cementitious materials

地址: [Sheng, Dige; Lan, Jirong; Zhou, Min; Hou, Haobo] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

[Sheng, Dige; Lan, Jirong; Zhou, Min; Hou, Haobo] Hubei Environm Remediat Mat Engn Technol Res Ctr, Wuhan 430072, Peoples R China.

[Du, Zhengyu; Ma, Yantao] Cent Southern China Elect Power Design Inst Co Ltd, China Power Engn Consulting Grp, Wuhan 430071, Peoples R China.

通讯作者地址: Zhou, M; Hou, HB (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

Zhou, M; Hou, HB (通讯作者)，Hubei Environm Remediat Mat Engn Technol Res Ctr, Wuhan 430072, Peoples R China.

电子邮件地址: zhoumin@whu.edu.cn; houhb@whu.edu.cn

影响因子：3.4