Investigation on sulfate activation of electrolytic manganese residue on early activity of blast furnace slag in cement-based cementitious material

Xu, Yingtang; Liu, Xiaoming; Zhang, Yuliang; Tang, Binwen; Mukiza, Emile

doi:10.1016/j.conbuildmat.2019.116831

Cited by 48 publications

(6 citation statements)

References 38 publications

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“…Therefore, there may be a potential risk of manganese leaching in the preparation of concrete from MTS, which may endanger human health and pollute the environment. Studies showed that cement-based materials are capable of solidifying heavy metals [42,43]. Figure 13 displays the leaching concentration of Mn 2+ in MTS and MTSC.…”

Section: The Leaching Concentration Of Mn 2+ In Mtscmentioning

confidence: 99%

Properties and Microstructural Characteristics of Manganese Tailing Sand Concrete

2022

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In this work, manganese tailing sand concrete (MTSC) was prepared using manganese tailing sand (MTS) in replacement of river sand (RS) to alleviate the shortage of RS resources and achieve clean treatment and high-value resource utilization of manganese tailing stone. The effects of MTS content on the slump, mechanical strength, air void characteristics, hydration products and micromorphology of MTSC were studied experimentally. The leaching risk of harmful substances in MTSC was also explored by testing the concentration of Mn2+. The results show that the utilization of MTS reduces the slump of MTSC to a certain extent. When the MTS content is lower than 40%, the gypsum introduced by MTS and C3A in cement undergoes a hydration reaction to form ettringite, which decreases the number of pores with a diameter less than 0.1 mm and promotes strength development in MTSC. Additionally, when the MTS content exceeds 40%, the large amount of gypsum reacts to form more ettringite. The expansive stress generated by the ettringite severely damages the pore structure, which is not conducive to the mechanical properties of MTSC. In addition, the leaching of hazardous substances in MTSC is insignificant, and the incorporation of cement can effectively reduce the risk of leaching hazardous substances in MTSC. In summary, it is completely feasible to use MTS to replace RS for concrete preparation when the substitution rate of MTS is less than 40%, with no risk of environmental pollution. The results and adaptation in the concrete industry can reduce the carbon footprint, which is in line with the current trend in civil and materials engineering.

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Section: The Leaching Concentration Of Mn 2+ In Mtscmentioning

confidence: 99%

Properties and Microstructural Characteristics of Manganese Tailing Sand Concrete

2022

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“…The cementitious materials prepared by composite with SS can increase mortar's density, whereas the soluble alkali in RM and sulfate substances rich in EMR can be used to excite the activity of SS. A few scholars have discovered [5,7,8] that the activity of both composite excitations of SS is better than that of individual excitation. This method not only maximizes the applications of multiple solid waste resources to prepare cementitious materials but also consumes less energy, is less costly, more feasible, and better coordinated with cement.…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanical Properties and Hydration Behavior of Steel Slag–Red Mud–Electrolytic Manganese Residue Based Composite Mortar

Chen

et al. 2023

Applied Sciences

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The functional and mechanical properties of steel slag (SS)–red mud (RM)–electrolytic manganese residue (EMR)-based composite mortar under different matching ratio conditions were investigated in this paper to examine the synergistic cementing effect among multiple solid wastes. The hydration characteristics of the composite mortar and its microstructure were characterized by the heat of hydration assessment, X-ray diffraction, thermogravimetric analysis, and other tests. The results of the study showed that compared with the pure cement group, 30% SS alone will inhibit the hydration reaction of the slurry, thus reducing the mechanical properties of the mortar, while compounding the appropriate amount of RM, and EMR can effectively reduce the negative impact of SS on the mechanical properties of the mortar. The flexural and compressive strengths of the composite mortar at 28 d were the highest when 15% of SS, 12% of RM, and 3% of EMR were mixed, which were 7.2 MPa and 41.4 MPa at 28 d, respectively. Compared with the test group with 30% SS alone, the flexural and compressive strengths increased by 18.0% and 25.5%. This is mainly because the incorporation of RM and EMR not only plays the role of physical filling, but the free alkali in RM and sulfate material in EMR can also compoundly stimulate the hydration activity of SS to produce more calcium alumina (AFt) and hydrated calcium silicate (C–S–H gel), thus improving the microstructure of mortar, which makes the overall decrease of 26.35% of multiharmful and harmful pores and the overall increase of harmless and less harmful pores of composite mortar specimens of 43.57%.

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“…Furthermore, for a P/N molar ratio of 1.1:1, and a pH value of 9.5, ammonia nitrogen could be removed in the form of magnesium ammonium phosphate, with a removal rate as high as 97.4%. Xu et al (2019) used a combination of EMS, blast furnace slag, and cement clinker to prepare cementitious materials. A mixture containing 15% EMS was shown to give the best material performance, with a flexural strength of 6.8 MPa, compressive strength of 32.9 MPa, and a 28 days strength of up to 52.5 MPa.…”

Section: Introductionmentioning

confidence: 99%

A study of the solidification and stability mechanisms of heavy metals in electrolytic manganese slag-based glass-ceramics

et al. 2022

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To better solve the waste pollution problem generated by the electrolytic manganese industry, electrolytic manganese slag as the main raw material, chromium iron slag, and pure chemical reagents containing heavy metal elements mixed with electrolytic manganese slag doping. A parent glass was formed by melting the slag mixture at 1,250°C, which was, thereafter, heat-treated at 900°C to obtain the glass-ceramic. The results from characterizations showed that the heavy metal elements in the glass-ceramic system were well solidified and isolated, with a leakage concentration at a relatively low level. After crystallization, the curing rates of harmful heavy metals all exceed 99.9%. The mechanisms of heavy metal migration, transformation, and solidification/isolation in glass-ceramic curing bodies were investigated by using characterization methods such as chemical elemental morphological analysis, transmission electron microscopy, and electron microprobe. The most toxic Cr and Mn elements were found to be mainly kept in their residual state in the glass-ceramic system. It was concluded that the curing mechanism of the heavy metals in a glass-ceramic can either be explained by the chemical curing induced by bonding (or interaction) during phase formation, or by physical encapsulation. Characterization by using both Transmission electron microscopy and EPMA confirmed that Cr and Mn were mainly present in the newly formed spinel phase, while the diopside phase contained a small amount of Mn. Zn, Cd, and Pb are not found to be concentrated and uniformly dispersed in the system, which is speculated to be physical coating and curing.

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Investigation on sulfate activation of electrolytic manganese residue on early activity of blast furnace slag in cement-based cementitious material

Cited by 48 publications

References 38 publications

Properties and Microstructural Characteristics of Manganese Tailing Sand Concrete

Properties and Microstructural Characteristics of Manganese Tailing Sand Concrete

Study on the Mechanical Properties and Hydration Behavior of Steel Slag–Red Mud–Electrolytic Manganese Residue Based Composite Mortar

A study of the solidification and stability mechanisms of heavy metals in electrolytic manganese slag-based glass-ceramics

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