Preparation of nickel–cobalt tailings-based cementing materials by mechano-chemical activation: Performance and mechanism

Xiang, Yuwei; Lan, Jirong; Cai, Yungao; Wang, Yi; Dong, Yiqie; Hou, Haobo

doi:10.1016/j.conbuildmat.2023.133836

Cited by 13 publications

(3 citation statements)

References 48 publications

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“…The heavy metal ion concentrations in the leachate were determined using an inductively coupled plasma optical emission spectrometer (ICP-OES). The leaching toxicity of the heavy metal ions was referred to the standard limits of various heavy metals specified in IV-class water from the national Chinese standards of GB 3838-2002 [30] and GB/T 14848-2017 [31,32].…”

Section: Heavy Metals Leaching Experimentsmentioning

confidence: 99%

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

Sheng,

Lan,

et al. 2024

Materials

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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.

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Section: Heavy Metals Leaching Experimentsmentioning

confidence: 99%

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

Sheng,

Lan,

et al. 2024

Materials

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“…In some works [43][44][45], the authors consider a three-dimensional formulation of the problem. The numerical methods that have proven themselves well when considering specific aspects [46,47] cannot always be successfully applied when dealing with three-dimensional models. At the same time, the issues of losing a part of the methane resources obtained from the technogenically disturbed massif, owing to the low efficiency of degassing the mined-out space, have not been fully studied.…”

Section: Introductionmentioning

confidence: 99%

Technogenic Reservoirs Resources of Mine Methane When Implementing the Circular Waste Management Concept

Brigida,

Golik,

Voitovich

et al. 2024

Resources

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From a commercial viewpoint, mine methane is the most promising object in the field of reducing emissions of climate-active gases due to circular waste management. Therefore, the task of this research is to estimate the technogenic reservoirs resources of mine methane when implementing the circular waste management concept. The novelty of the authors’ approach lies in reconstructing the response space for the dynamics of methane release from the front and cross projections: CH4 = ƒ(S; t) and CH4 = ƒ(S; L), respectively. The research established a polynomial dependence of nonlinear changes in methane concentrations in the mixture extracted by type 4 wells when a massif is undermined as a result of mining in a full-retreat panel. And the distance from the face to the start of mining the panel is reduced by 220 m. For this reason, the emission of mine methane, in case of degasification network disruption in 15 days, can amount to more than 660 thousand m3 only for wells of type no. 4.

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“…Alieh Saedi et al [ 23 , 24 ] explored the possibility of lead–zinc sulfide tailings replacing part of cement and proposed the most suitable substitution ratio. In addition, scholars have also conducted relevant research on the possibility of fabricating cementitious materials from gold, tungsten, and nickel–cobalt tailings [ 25 , 26 , 27 , 28 , 29 ]. Fly ash, a by-product of coal burning, will cause a serious threat to the environment and atmosphere when discharged [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Cementitious Material with Thermal-Activated Lead–Zinc Tailings Based on Response Surface Methodology

Lin,

Yin,

2024

Materials

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The accumulation of lead–zinc tailings will cause a series of problems, including geological disasters and environmental pollution. Efficient secondary utilization of lead–zinc tailings is crucial. In this study, the activity of lead–zinc tailings was stimulated by thermal activation. The optimal thermal activation parameters are a thermal activation temperature of 900 °C and a holding time of 30 min. Based on the response surface methodology, the effect of raw materials content on cementitious material strength was analyzed, and the relational model between cementitious material strength and experimental variables was established. The results show that the sensitivity order of cementitious material strength at 28 days curing age is sand/cement ratio > water/cement ratio > fly ash content > tailing content. According to the relational model, the optimal materials ratio is as follows: tailing/fly ash/cement = 28.99%:14.58%:56.43%, and the sand/binder ratio and water/binder ratio are 1:1 and 0.47, respectively. The corresponding cost is CNY 290.965 per ton, which is the lowest. The strength of cementitious material with these parameters can reach 20 MPa, which meets the requirements of “Technical specification for application of solid waste cementitious material (T/CECS 689-2020)”.

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Preparation of nickel–cobalt tailings-based cementing materials by mechano-chemical activation: Performance and mechanism

Cited by 13 publications

References 48 publications

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

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

Technogenic Reservoirs Resources of Mine Methane When Implementing the Circular Waste Management Concept

Optimization of Cementitious Material with Thermal-Activated Lead–Zinc Tailings Based on Response Surface Methodology

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