Mechanical and leaching characteristics of red mud residue solidified/stabilized high Cu(II)-contaminated soil

Suo, Chongxian; Yao, Xin; Song, Zhiwei; Dong, Xiaoqiang

doi:10.1007/s12665-021-10043-8

Cited by 11 publications

(3 citation statements)

References 45 publications

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“…When Portland cement comes into contact with polluted soil, it not only reacts with pore water, but also reacts with clay minerals and heavy metal pollutants in polluted soil 11 . This makes the lifting mechanism of Portland cement on heavy metal polluted soil more complicated than that on clean soil (without heavy metal pollutants) treated by Portland cement 12 .…”

Section: Methods Of Solidification and Remediation Of Heavy Metal Con...mentioning

confidence: 99%

Solidification, remediation and long-term stability of heavy metal contaminated soil under the background of sustainable development

Jia

Liu

2022

Sci Rep

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At present, the global pollution has seriously exceeded the standard. With the passage of time, pollution has gradually affected people’s daily lives, but the solution to pollution is far from achieving a better treatment effect. For the treatment of pollution, in addition to considering the treatment effect, it is also necessary to consider whether the treatment method will cause pollution and the cost of the treatment of the pollutants. As one of the lifelines of human survival, the land is also suffering from pollution. The impact of heavy metal pollution is particularly serious, and there is no better solution. Based on this, this paper proposes a curing agent based on sustainable remediation to solve the soil pollution of heavy metals. The main material is Basic oxygen furnace slag (BOFS), which has excellent social development characteristics in all aspects, and the raw materials are calcium carbide residue (CCR) and phosphogypsum (PG) to explore a more suitable curing agent. (consisting of BOFS, CCR, and PG, abbreviated as BCP). The experimental results in this paper show that the volume of pores and pores in the agglomerates are slightly reduced, and the content of curing agent is increased from 4 to 10%, while the corresponding volume is only reduced by 0.006 and 0.017 mL/g. Therefore, it can be seen that the reduction of the pore volume between the aggregates of the stabilized species of BCP has made a major contribution to the strength development.

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Section: Methods Of Solidification and Remediation Of Heavy Metal Con...mentioning

confidence: 99%

Solidification, remediation and long-term stability of heavy metal contaminated soil under the background of sustainable development

Jia

Liu

2022

Sci Rep

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“…Ma et al [25] reported that the addition of an appropriate content of RM could effectively improve the UCS of stabilized soil. Suo et al [26] investigated the mechanical properties of heavy-metal-contaminated soil stabilized by RM and desulfurized gypsum and found that after adding a stabilizer, the UCS of the contaminated soil increased by about 130-260%. In addition, in practice, temperature (i.e., freeze-thaw) is one of the main factors causing a deterioration in the performance of road base material [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Engineering Properties and Microstructure of Soils Stabilized by Red-Mud-Based Cementitious Material

Li,

Huang,

Chen

et al. 2024

Materials

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Red mud (RM) is an industrial waste generated in the process of aluminum refinement. The recycling and reusing of RM have become urgent problems to be solved. To explore the feasibility of using RM in geotechnical engineering, this study combined magnesium oxide (MgO) (or calcium oxide (CaO)) with RM as an RM-based binder, which was then used to stabilize the soil. The physical, mechanical, and micro-structural properties of the stabilized soil were investigated. As the content of MgO or CaO in the mixture increased, the unconfined compressive strength (UCS) of the RM-based cementitious materials first increased and then decreased. For the soils stabilized with RM–MgO or RM–CaO, the UCS increased and then decreased, reaching a maximum at RM:MgO = 5:5 or RM:CaO = 8:2. The addition of sodium hydroxide (NaOH) promoted the hydration reaction. The UCS enhancement ranged from 8.09% to 66.67% for the RM–MgO stabilized soils and 204.6% to 346.6% for the RM–CaO stabilized soils. The optimum ratio of the RM–MgO stabilized soil (with NaOH) was 2:8, while that of the RM–CaO stabilized soil (with NaOH) was 4:6. Freeze–thaw cycles reduced the UCS of the stabilized soil, but the resistance of the stabilized soil to freeze–thaw erosion was significantly improved by the addition of RM–MgO or RM–CaO, and the soil stabilized with RM–MgO had better freeze–thaw resistance than that with RM–CaO. The hydrated magnesium silicate generated by the RM–MgO stabilized soil and the hydrated calcium silicate generated by the RM–CaO stabilized soil helped to improve the UCS of the stabilized soil. The freeze–thaw cycles did not weaken the formation of hydration products in the stabilized soil but could result in physical damage to the stabilized soils. The decrease in the UCS of the stabilized soil was mainly due to physical damage.

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“…Zhang et al [19] used red mud, carbide slag, and electrolytic manganese slag as subgrade materials, which exhibited strong compressive strengths and durability. Suo et al [20] used red mud and cement to solidify soil with a high concentration of copper ions, and the engineering characteristics and leaching toxicity of the solidified soil fully met the requirements.…”

Section: Introductionmentioning

confidence: 99%

Study on Properties of Copper-Contaminated Soil Solidified by Solid Waste System Combined with Cement

Liang¹,

Zhang

Fang

et al. 2022

Sustainability

Self Cite

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Three industrial solid wastes including red mud, carbide slag, and phosphogypsum combined with ordinary Portland cement were used as curing agents to solidify/stabilize loess polluted by a high concentration of copper ions. The unconfined compressive strength, resistivity, permeability coefficient, copper ion leaching concentration, pH value, and other engineering application evaluation indexes were analyzed to preliminarily assess the applicability of the curing agent in the remediation of soil contaminated with a high concentration of copper ions. The mineral phases and functional groups of solidified soil were detected using XRD and FTIR, showing that the strength, electrical resistivity, and pH value of solidified soil decrease following the addition of copper ions. Moreover, the strength and resistivity of solidified soil increase with the curing age, and the pH value decreases with age. For solidified contaminated soil, when the total content of curing agent increases from 10 to 20%, the maximum 28 d strength increases from 1.35 to 5.43 MPa, and in this study, its permeability coefficient, copper ion leaching concentration, and pH value were found to be within the limits set by relevant national standards. In conclusion, red mud-carbide slag-phosphogypsum combined with cement has a good stabilizing effect on sites polluted with a high concentration of copper ions.

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Mechanical and leaching characteristics of red mud residue solidified/stabilized high Cu(II)-contaminated soil

Cited by 11 publications

References 45 publications

Solidification, remediation and long-term stability of heavy metal contaminated soil under the background of sustainable development

Solidification, remediation and long-term stability of heavy metal contaminated soil under the background of sustainable development

Engineering Properties and Microstructure of Soils Stabilized by Red-Mud-Based Cementitious Material

Study on Properties of Copper-Contaminated Soil Solidified by Solid Waste System Combined with Cement

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