Mechanism and assessment of the pozzolanic activity of melting-quenching lithium slag modified with MgO

He, Yan; Kang, Qi; Lan, Ming; Peng, Huaide

doi:10.1016/j.conbuildmat.2022.129692

Cited by 10 publications

(6 citation statements)

References 54 publications

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“…In addition to analyzing the PSD of LS, various physical properties, including density, SSA, and moisture content, have also been examined. The SSA of LS, as reported by different researchers [ 14 , 38 , 42 ], exhibited a range from 265 to 1362 m 2 /kg, with an average value of 698 m 2 /kg, which is attributed to the porous surface texture of LS [ 70 ]. It is generally finer than the SSA of cement (350 m 2 /kg), fly ash (350 m 2 /kg), and GGBFS (400 m 2 /kg) [ 71 , 72 , 73 ].…”

Section: Physiochemical and Microscopic Analysis Of Lsmentioning

confidence: 92%

“…Research has demonstrated that particle size, chemical composition, and amorphous content (silica and alumina) are key determinants of the pozzolanic activity exhibited by noncrystalline materials [ 40 ]. Therefore, investigations into the physical characteristics of LS encompass parameters such as the specific surface area (SSA) [ 14 , 41 ], specific gravity [ 33 ], density [ 42 , 43 ], moisture content [ 41 ], and particle size distribution [ 22 , 44 ]. In parallel, conventional analytical methods have been employed to scrutinize the chemical composition of LS, including X-ray diffraction (XRD) [ 23 , 44 ] and scanning electron microscopy with energy-dispersive spectroscopy (SEM/SEM-EDS) [ 44 , 45 , 46 ], as well as specialized techniques such as Fourier transform infrared spectroscopy (FTIR) [ 31 , 45 ], nuclear magnetic resonance (NMR) [ 30 , 47 ], X-ray photoelectron spectroscopy (XPS) [ 30 ], and thermogravimetry (TG)/thermogravimetric and derivative thermogravimetric analysis (TG-DTG) [ 19 , 43 , 48 ].…”

Section: Introductionmentioning

confidence: 99%

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A Review on Cementitious and Geopolymer Composites with Lithium Slag Incorporation

Gou,

Rupasinghe,

Sofi

et al. 2023

Materials

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This study critically reviews lithium slag (LS) as a supplementary cementitious material (SCM), thereby examining its physiochemical characteristics, mechanical properties, and durability within cementitious and geopolymer composites. The review reveals that LS’s particle size distribution is comparable to fly ash (FA) and ground granulated blast furnace slag (GGBS), which suggests it can enhance densification and nucleation in concrete. The mechanical treatment of LS promotes early hydration by increasing the solubility of aluminum, lithium, and silicon. LS’s compositional similarity to FA endows it with low-calcium, high-reactivity properties that are suitable for cementitious and geopolymeric applications. Increasing the LS content reduces setting times and flowability while initially enhancing mechanical properties, albeit with diminishing returns beyond a 30% threshold. LS significantly improves chloride ion resistance and impacts drying shrinkage variably. This study categorizes LS’s role in concrete as a filler, pozzolan, and nucleation agent, thereby contributing to the material’s overall reduced porosity and increased durability. Economically, LS’s cost is substantially lower than FA’s; meanwhile, its environmental footprint is comparable to GGBS, thereby making it a sustainable and cost-effective alternative. Notwithstanding, there is a necessity for further research on LS’s fine-tuning through grinding, its tensile properties, its performance under environmental duress, and its pozzolanic reactivity to maximize its utility in concrete technologies. This study comprehensively discusses the current strengths and weaknesses of LS in the field of building materials, thereby offering fresh perspectives and methodologies to enhance its performance, improve its application efficiency, and broaden its scope. These efforts are driving the sustainable and green development of LS in waste utilization and advanced concrete technology.

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Section: Physiochemical and Microscopic Analysis Of Lsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

A Review on Cementitious and Geopolymer Composites with Lithium Slag Incorporation

Gou,

Rupasinghe,

Sofi

et al. 2023

Materials

View full text Add to dashboard Cite

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Section: Mechanism Analysismentioning

confidence: 99%

“…These gels continue to grow and diffuse inside the CLTB, resulting in higher compressive strength. The LSB matrix exhibits good pozzolanic activity and can provide good cementing ability for the LFT [60]. The actual backfill conveying pipeline of a lithium mine in Yichun City, China, requires the fluidity of the filling slurry to be higher than 200 mm.…”

Section: Mechanism Analysismentioning

confidence: 99%

Lithium Slag and Solid Waste-Based Binders for Cemented Lithium Mica Fine Tailings Backfill

Li,

Huang,

et al. 2023

Materials

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To mitigate the adverse effects of fine-grained lithium mica tailings and other solid wastes generated from the extraction of lithium ore mining, as well as the limitations of traditional cement-based binders for lithium mica fine tailings, this study explores the feasibility of using a binder composed of ordinary Portland cement, lithium slag, fly ash, and desulfurization gypsum to stabilize lithium fine tailings into cemented lithium tailings backfill. Compared with traditional cementitious binders, an extensive array of experiments and analyses were conducted on binders formed by various material proportion combinations, employing uniaxial compressive strength tests, microstructural morphology, grayscale analyses, and flowability tests. The results show the following: (1) In this study, an LSB binder exhibiting superior mechanical properties compared to traditional cementitious binders was identified, with an optimal OPC:LS:FA:DG ratio of 2:1:1:1. (2) In the context of cemented lithium mica fine tailings, the LSB-CLTB material exhibits higher unconfined compressive strength and lower self-weight compared to OPC-CLTB materials. At a binder content of 10 wt%, the UCS values achieved by the LSB-CLTB material at curing periods of 7 days, 14 days, and 28 days are 0.97 MPa, 1.52 MPa, and 2.1 MPa, respectively, representing increases of 40.6%, 34.5%, and 44.8% over the compressive strength of OPC-based materials under the same conditions. (3) The LSB binder not only exhibits enhanced pozzolanic reactivity but also facilitates the infilling of detrimental pores through its inherent particle size and the formation of AFt and C-(A)-S-H gels via hydration reactions, thereby effectively improving the compressive strength performance of fine-grained tailings backfill.

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“…Therefore, it is necessary to develop gel materials with better durability and higher strength to meet the needs of deep mining [14]. China is a major mining country, which produces a large number of tailings every year [15]. Many Chinese researchers conducted related research on the reuse of tailings, including the use of tailings for the preparation of geopolymer [16].…”

Section: Introductionmentioning

confidence: 99%

Solidification Experiment of Lithium-Slag and Fine-Tailings Based Geopolymers

Dai¹,

Zeng²,

et al. 2023

Sustainability

Self Cite

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Based on the pressure of environmental protection, more and more scientific researchers are trying to reuse aluminum–silicon-rich industrial wastes. In this study, activated lithium-slag and lead–zinc tailings were used as raw materials to prepare geopolymers at ratios of 3:7, 1:1, and 7:3. These geopolymers were initially cured for 12 h at 25 °C, 50 °C, 75 °C, and 100 °C and were then cured at room temperature to the specified ages. The compressive strength of each group of geopolymers was tested at the ages of 3 days, 7 days, and 28 days. The optimal group of samples was selected, that is, those with a ratio of lithium-slag to lead–zinc tailings of 7:3 and an initial curing temperature of 75 °C. After that, the heavy metal leaching test and porosity analysis test were carried out on the optimal group of samples, and the curing effect was considered to meet the requirements of the Chinese specifications. In addition, in order to reveal the mechanism of the chemical reaction, scanning electron microscopy and X-ray diffraction (XRD) were used to study the microstructure and hydration products of the C3 group cured samples. This study provides a new concept for the reuse of industrial wastes such as lithium-slag and fine-tailings.

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Mechanism and assessment of the pozzolanic activity of melting-quenching lithium slag modified with MgO

Cited by 10 publications

References 54 publications

A Review on Cementitious and Geopolymer Composites with Lithium Slag Incorporation

A Review on Cementitious and Geopolymer Composites with Lithium Slag Incorporation

Lithium Slag and Solid Waste-Based Binders for Cemented Lithium Mica Fine Tailings Backfill

Solidification Experiment of Lithium-Slag and Fine-Tailings Based Geopolymers

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