A review of additives used in the cemented paste tailings: Environmental aspects and application

Saedi, Alieh; Jamshidi-Zanjani, Ahmad; Darban, Ahmad Khodadadi

doi:10.1016/j.jenvman.2021.112501

Cited by 59 publications

(16 citation statements)

References 66 publications

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“…In general, the decrease in the water content increased CPB's performance. Basically, the free water required for CPB's cement hydration governs the amount of final water [48].…”

Section: Geotechnical Parametersmentioning

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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“…In general, the decrease in the water content increased CPB's performance. Basically, the free water required for CPB's cement hydration governs the amount of final water [48].…”

Section: Geotechnical Parametersmentioning

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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“…31 Nowadays, due to the increasing demand for mineral products, there is a greater need for mineral mining, which will directly lead to a lower grade of ore in the mine. 32 Therefore, it is inevitable that a higher amount of tailings will be produced in the future. Realizing high-value utilization of a large number of tailings and turning waste into treasure is a way of resource recycling.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Tailings, generated during the extraction and treatment of orebodies, are the most abundant solid wastes throughout the world and cause irreversible pollution and damage to the ecological environment . Nowadays, due to the increasing demand for mineral products, there is a greater need for mineral mining, which will directly lead to a lower grade of ore in the mine . Therefore, it is inevitable that a higher amount of tailings will be produced in the future.…”

Section: Introductionmentioning

confidence: 99%

Highly Active Ni–Ru Bimetallic Catalyst Integrated with MFI Zeolite-Loaded Cerium Zirconium Oxide for Dry Reforming of Methane

Miao

Chen

Shang

et al. 2022

ACS Appl. Mater. Interfaces

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The dry reforming of methane (DRM) is a new potential technology that converts two major greenhouse gases into useful chemical feedstocks. The main challenge faced by this process is maintaining the catalyst with high catalytic activity and long-term stability. Here, a simple and effective preparation route for the synthesis of functional nanomolecular sieve catalysts (NiRu x CZZ5) from kaolinite tailings was developed for dry reforming of methane with CO 2 . The silica monoliths with flower-like spherical and micropore structures (ZSM-5) were prepared by crystal growth method, and the metal components were loaded by ultrasonic-assisted impregnation method. The NiRu 0.5 CZZ5 catalyst exhibited excellent catalytic performance (maxmium CO 2 and CH 4 conversions up to 100 and 95.6%, respectively) and very good stability (up to 100h). The interfacial confinement and the strong support interaction are principally responsible for the excellent catalytic activity of the catalyst. The in situ DRIFTS was used to elucidate the possible carbon conversion steps, and stable surface intermediates were also identified.

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“…Currently, the easiest and most cost-effective method for mine waste disposal is to reuse tailings as cemented paste backfill (CPB) and transfer them to underground cavities [1][2][3]. Generally, the cemented paste backfilling technology tends to be a sustainable way in mining and green mines construction by facilitating the disposal of mine spoils efficiently, which reduces the dangers of tailings dam collapse and promotes the recovery of resources [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the cemented paste backfilling technology tends to be a sustainable way in mining and green mines construction by facilitating the disposal of mine spoils efficiently, which reduces the dangers of tailings dam collapse and promotes the recovery of resources [4][5][6]. The use of CPB in backfilling technology is desirable for mine backfill plants due to its non-classification, non-segregation, and non-sedimentation characteristics [2].…”

Section: Introductionmentioning

confidence: 99%

The Role of Rheological Additives on Fresh and Hardened Properties of Cemented Paste Backfill

et al. 2022

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Cemented paste backfill (CPB) has become a significant structural material in most mines across the world. In this study, the effects of chemical rheological additives including viscosity modifying agent (i.e., polyacrylamide) and polycarboxylate superplasticizer (PCE) on fresh and hardened properties of CPB with different water-to-solid (W/S) ratios and water-to-cement (W/C) ratios were investigated. The microstructure of CPB specimens was also characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and backscattered electron image (SEM-BSE). The obtained results indicate that PAM (polyacrylamide) dosage and W/S are the most significant parameters influencing the workability of fresh CPB mixtures. For the hardened CPB specimens, the decreasing W/S ratio leads to higher flexural and compressive strength values and lower dry shrinkage strains. The interfacial transition zone (ITZ) between the cement matrix and the tailings sand was also observed to be narrower, with fewer micro cracks and capillary pores. Meanwhile, the existence of PAM decreased the number of hydration products and retarded the hydration reaction. Overall, the CPBs with high W/C ratios (i.e., 1.0 and 1.2), low W/S ratios (i.e., 0.3), and moderate amounts of rheological additives (i.e., 0.05% PAM and 1.0% PCE) have excellent fresh and hardened properties. The findings of this study contribute to better optimization of CPB mixtures in backfill construction, bringing benefits of low costs and low environmental impacts.

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A review of additives used in the cemented paste tailings: Environmental aspects and application

Cited by 59 publications

References 66 publications

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

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

Highly Active Ni–Ru Bimetallic Catalyst Integrated with MFI Zeolite-Loaded Cerium Zirconium Oxide for Dry Reforming of Methane

The Role of Rheological Additives on Fresh and Hardened Properties of Cemented Paste Backfill

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