Effect of Sulfur Content in Sulfate-Rich Copper Tailings on the Properties of MgO-Activated Slag Materials

被引:4
|
作者
Chen, Peiyuan [1 ,2 ]
Yang, Fan [3 ]
Qian, Xin [3 ]
Fang, Yi [2 ]
Li, Jin [1 ]
Chen, Xueyan [1 ]
Wang, Yonghui [1 ]
机构
[1] Anhui Univ Sci & Technol, Sch Civil Engn & Architecture, Huainan 232001, Peoples R China
[2] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Kowloon, Hong Kong, Peoples R China
[3] Tongji Univ, Key Lab Infrastruct Durabil & Operat Safety, Airfield CAAC, Shanghai 201804, Peoples R China
基金
中国国家自然科学基金;
关键词
sulfate-rich copper tailings; MgO-activated slag materials; compressive strength; hydration products; SODIUM-SULFATE; STRENGTH; HYDRATION; RESISTANCE; SULFIDE; OXIDATION; BACKFILL;
D O I
10.3390/ma15124340
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The high-value utilization of sulfate-rich tailings (SRCTs) can accelerate their mass consumption, so the many problems caused by the massive accumulation of SRCTs can be alleviated, such as environmental pollution, land occupation, security risk, etc. This study proposes using SRCTs to replace fine natural aggregates in MgO-activated slag materials (MASMs) and investigate the influence of the sulfur content in SRCTs on the properties of MASMs. The experimental results showed that the 28 d compressive strength of MASM mortars was increased by up to 83% using SRCT composites. Two major mechanisms were discovered: additional hydration product formation and pore structure refinement. The results of XRD suggested that incorporating SRCT composite into MASMs increased the production of expansive sulfate-containing hydration products, such as ettringite, gypsum, and hydroxyl-Afm. The results of element mapping showed that the oxidation of pyrite in SRCTs could release sulfates into the surrounding area and participate in the hydration of MASM, indicating that SRCTs can work as an auxiliary activator for MASMs. Furthermore, the addition of SRCT significantly refined the pore structure of MASMs, leading to the reduction in porosity by up to 37.77%. These findings confirm a synergistic effect on activating the slag between SRCTs and MgO, promoting the mass utilization of SRCTs. As a result, the additional expansive hydration products contribute to the enhanced compressive strength and refined pore structure.
引用
收藏
页数:13
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