Rheological Properties of Cemented Paste Backfill with Alkali-Activated Slag

Kou, Yunpeng; Jiang, Haiqiang; Ren, Lei; Yilmaz, Erol; Li, Yuanhui

doi:10.3390/min10030288

Cited by 73 publications

(20 citation statements)

References 45 publications

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“…In addition, ensuring the harmlessness and environmental compatibility of the processing tailings, the durability plays a key role on the overall performance of CPB samples (Libos and Cui, 2020). Typically, CPB is prepared in a surface paste plant by dewatering fine tailings to form a filter cake, then a sufficient amount of mixing water and binder agents is added to create the mixture pumpable to underground stopes (Kou et al, 2020). Since CPB offers several significant environmental, technical, and economic benefits, it is considered as one of the best available techniques in Europe for the management of tailings (Chen et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Strength and Quality of Cemented Mine Backfill Made up of Lead-Zinc Processing Tailings

2021

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Predicting the reactions of the backfill materials exposed to the effects of air and groundwater will eventually ensure an efficient and accurate mine fill system for sustainable mining operations. This paper reveals the effect of the mobility of sulfur ions within lead-zinc processing tailings on strength and quality of cemented mine backfills. Some laboratory tests such as X-ray diffraction, ion chromatography, scanning electron microscopy, combustion tests, chemical analysis, pH and zeta potential measurements were performed to better characterize the backfill’s mechanical and microstructural properties. Moreover, CEM II/A-P Portland pozzolan and CEM IV/A pozzolanic cements as ready-to-use cement products were used for cemented mine backfill preparation. To ensure the carrier of the lead-zinc tailings and to prevent the mobility of the sulfurous components, a binder content ranging from 3 to 7 wt% were employed in mine backfills. The experimental findings demonstrate that the used cement type and proportions were insufficient and some fractures are occurred in the samples due to the sulfur ion mobility. Accordingly, one can state clearly that the elemental analysis through the combustion test method can provide fast and reliable results in the determination of sulfur within lead-zinc processing tailings.

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Section: Introductionmentioning

confidence: 99%

Characterization of Strength and Quality of Cemented Mine Backfill Made up of Lead-Zinc Processing Tailings

2021

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“…Hence, another innovative route has been suggested. For example, steel waste could be utilized as an alkali-activated material in the production of greener construction materials [ 73 , 74 , 75 ].…”

Section: Steel Waste Managementmentioning

confidence: 99%

Recent Developments in Steelmaking Industry and Potential Alkali Activated Based Steel Waste: A Comprehensive Review

et al. 2022

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The steel industry is responsible for one-third of all global industrial CO2 emissions, putting pressure on the industry to shift forward towards more environmentally friendly production methods. The metallurgical industry is under enormous pressure to reduce CO2 emissions as a result of growing environmental concerns about global warming. The reduction in CO2 emissions is normally fulfilled by recycling steel waste into alkali-activated cement. Numerous types of steel waste have been produced via three main production routes, including blast furnace, electric arc furnace, and basic oxygen furnace. To date, all of the steel waste has been incorporated into alkali activation system to enhance the properties. This review focuses on the current developments over the last ten years in the steelmaking industry. This work also summarizes the utilization of steel waste for improving cement properties through an alkali activation system. Finally, this work presents some future research opportunities with regard to the potential of steel waste to be utilized as an alkali-activated material.

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“…Nevertheless, the current study will consider acidified dam tailings for mine fill applications, especially for cemented paste backfill (CPB), while the nondamaged dam tailings are out of the scope of this study. Being an innovative tailings disposal system, CPB allows mine operators to send 65-80% of pyritic tailings back to underground stopes as backfill (it helps to build for ground support) or disposal purposes [23,24]. Unlike concrete materials, CPB has unique properties such as finer (at least 15% under 20 μm) grain size, higher (typically more than 5) water/cement ratio, and lower (typically less than 10%) cement content [25,26].…”

Section: Introductionmentioning

confidence: 99%

Recycling Dam Tailings as Cemented Mine Backfill: Mechanical and Geotechnical Properties

Kasap

Yilmaz

Guner

et al. 2022

Advances in Materials Science and Engineering

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As a result of developing technology and scientific studies, employing dam tailings as critical raw material and vital economic reserve has become widespread recently. Employing dam tailings as a main ingredient of CPB (cemented paste backfill) can offer benefits to mining operations. This study deals with the use of dam tailings in CPB, considering the mechanical and geotechnical aspects. CPB was prepared at fixed solid and cement contents (72%, and 5%, respectively) and tested for different cure ages varying from 3 to 56 days. The results disclosed that the strength of filling increased over time, with the exception of 56-day cured CPB having high sulfur minerals where strength decreased sharply. The reasons behind these strength surges could be clarified by CPB’s basicity, which quickens the hydration of cement. Voids between tailings grains are also occupied by hydration products, resulting in the high strengths. Due to the fact that higher sulfate contents can cause lower pH values within CPB, this is one of the factors that should be considered for the backfill’s strength performance. The cement tends to increase the backfill’s pH in short term, but pH of long-term cured backfills decreases because of dam tailings which is inclined to acid formations and erosions. This is a sign that the deformation properties of CPB are deteriorated. Depending on curing time, CPB’s water content and void ratio decrease, but their surface areas increase. The resulting data will endow to better apprehend the effects of dam tailings on CPB quality integrating cost and quality.

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Rheological Properties of Cemented Paste Backfill with Alkali-Activated Slag

Cited by 73 publications

References 45 publications

Characterization of Strength and Quality of Cemented Mine Backfill Made up of Lead-Zinc Processing Tailings

Characterization of Strength and Quality of Cemented Mine Backfill Made up of Lead-Zinc Processing Tailings

Recent Developments in Steelmaking Industry and Potential Alkali Activated Based Steel Waste: A Comprehensive Review

Recycling Dam Tailings as Cemented Mine Backfill: Mechanical and Geotechnical Properties

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