Paste Backfill Technology: Essential Characteristics and Assessment of its Application for Mill Rejects of Uranium Ores

Deb, Debasis; Sreenivas, T.; Dey, G.K.; Panchal, Sandeep

doi:10.1007/s12666-016-0999-0

Cited by 23 publications

(9 citation statements)

References 18 publications

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“…When the activator modulus is low, the filling slurry is prone to rapid coagulation. Deb et al [1] show that the strength of the backfill can reach 70%-80% of the final strength at 4 h. In 16 groups of tests, the strength of 28 d age specimens is generally 1.15-3.52 times of that of 7 d age specimens, and only the 8th and 9th groups of specimens are more than 22 times, but the 28 d age strength of the 9th group of specimens was only 5.67 MPa, which was due to the fact that only quicklime was used as cementitious material, but no cementitious material was added, and the content of quicklime in group 8 was less and the activation modulus was relatively high, which was the reason for the low strength at 7 d age.…”

Section: Orthogonal Analysis Of Strength Characteristics Of Cutbmentioning

confidence: 99%

“…Surface stacking is one of the most important disposal methods of uranium tailings, in which radioactive and nonradioactive materials migrate and disperse under the action of weathering leaching, causing pollution to soil, water, and air. However, as a kind of long-lived, largevolume and low (or extremely low) level radioactive solid waste, uranium tailings cannot be completely treated in the way of high (or medium) level radioactive solid waste disposal [1][2][3][4][5]. In the field of filling mining, paste filling has the characteristics of "no precipitation, no bleeding, and no segregation" and can effectively control the diffusion of harmful components in filling materials in groundwater, which is consistent with the principle of cement solidification method in radioactive solid waste [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Mechanical Properties of Cemented Uranium Tailing Backfill Based on Alkali‐Activated Slag

Wang

Chen

et al. 2020

Advances in Materials Science and Engineering

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Backfilling disposal based on cement solidification is one of the ways to solve the environmental and safe problems of uranium tailing surface stacking. Alkali-activated slag, especially sodium silicate activated geopolymer, has become the preferred cementing material for the uranium tailing backfilling system because of its advantages of corrosion resistance and high strength. In this paper, uranium tailings and slag are taken as research objects, and the unconfined compressive strength (UCS) is taken as the main quality index. The preparation method of the cemented uranium tailing backfill based on alkali-activated slag was studied, hereinafter referred to as CUTB. The effects of additive amount, activator amount and activator modulus on the strength of CUTB were investigated. The results show that alkali-activated slag is an effective cementing material for the backfilling system of uranium tailing aggregate. The maximum UCS of 28 d age in the test groups is 16.45 MPa. Quicklime is an important additive for preparing CUTB. When the amount of quicklime is 0%, the early and late strengths of the filling body cannot be measured or at a very low level. At the age of 7 d, the order of each factor is additive amount > activator modulus > activator amount, but at the age of 28 d, the order of each factor is additive amount > activator amount > activator modulus. The test results can provide a basis for choosing cementitious materials for backfilling disposal of uranium tailings.

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Section: Orthogonal Analysis Of Strength Characteristics Of Cutbmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and Mechanical Properties of Cemented Uranium Tailing Backfill Based on Alkali‐Activated Slag

Wang

Chen

et al. 2020

Advances in Materials Science and Engineering

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“…Citation: Wang C, Wang C, Xiong Z, Wang Y, Han Y (2020) Experimental study of high-flow and lowexpansion backfill material. PLoS ONE 15 (8): e0236718. https://doi.org/10.1371/journal.…”

Section: Open Accessmentioning

confidence: 99%

“…Therefore, new mining engineering materials will play a crucial role in the development of green mining [1][2][3]. As determined by commonly-used backfill materials, the backfill processes in China include waste rock dry filling, sand water filling, tail filling, cemented filling with unclassified tailings, and paste and paste-like filling [4][5][6][7][8][9]. These processes are complex and have large transportation volumes, a1111111111 a1111111111 a1111111111 a1111111111 a1111111111…”

Section: Introductionmentioning

confidence: 99%

Experimental study of high-flow and low-expansion backfill material

Wang

Chun

Xiong³

et al. 2020

PLoS ONE

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High-flow low-expansion backfill materials have been developed to improve difficult slurry pipeline transport and poor roof-contact effect of many filling materials. The fly ash content was fixed at 80%, with 8.5%-9.5% mineral powder content, 8.5%-9.5% lime, 2%-3% desulfurized gypsum, 0.9%-1.2% sodium carbonate, and 0.01%-0.02% aluminum powder content. The prepared backfill material processed good fluidity, with the expansion rate of the hardened material reaching 2%-3%, and compressive strength on 90 d reaching 4 MPa-5.5 MPa. SEM observations indicated that as the aluminum content increased, ettringite on bubble walls transformed from a fine-needle to needle-rod shape. Secondly, the hydration products of the system were mainly hydrated calcium silicate gel and ettringite, which interconnected and promoted the formation of the structure. The backfill material has extensive sources of raw materials, low cost, simple filling process, and good filling effect.

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“…CPB comprises three main components, namely dewatered mine tailings (70-85 % solids by weight), mixing water and hydraulic binders (3-7 % by paste weight), which may include Ordinary Portland Cement (OPC), fly ash, and ground granulated blast furnace slag; these components combine via hydration reactions to form a complex porous structure which may be utilised as a passive support material within underground mining operations (Fall et al, 2009). It is well-known that mixing water chemistry, including acidity and ionic concentrations, can impact the mechanical properties of hydrated CPB materials (Deb et al, 2017;Qi and Fourie, 2019). As access to low-salinity water in many mining operations is limited, and the local source water typically hypersaline, it is therefore of significant interest to determine the influence of hypersaline mixing water on the evolution of hydrated CPB materials.…”

Section: Introductionmentioning

confidence: 99%

Understanding the microstructural evolution of hypersaline cemented paste backfill with low-field NMR relaxation

Nasharuddin¹,

Luo²,

Robinson³

et al. 2021

Preprint

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Cemented paste backfill (CPB) comprising mineral tailings, binders and mixing waters is an important potential support material in the mining industry. As the mechanical properties of CPB are significantly influenced by its microstructural characteristics the development of measurement tools to better understand its pore structure evolution is important for its increased utilisation. This study reports the application of low-field nuclear magnetic resonance (NMR) relaxation time measurements to characterise the microstructural evolution of CPB materials over 56 days of hydration, contrasting common tap water and hypersaline water (~22 wt% salt) as mixing waters. Distinct NMR relaxation time populations were evidenced within each CBP sample, revealing the presence of both capillary (T1,2 ≈ 10 ms) and gel pore water (T1,2 ≈ 300 – 500 µs), with time-dependent relaxation measurements facilitating characterisation of capillary pore structure evolution over the hydration period assessed. Hypersaline samples demonstrated a time-lag in this measured capillary pore evolution, relative to those hydrated with tap water, while hydration rates were observed to increase with increased CPB binder content. Further, both T1 and T2 NMR relaxation times were found to correlate with the uniaxial compressive strength of the CPB materials investigated, facilitating the formulation of a predictive correlation function between NMR relaxation characteristics and mechanical properties.

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Paste Backfill Technology: Essential Characteristics and Assessment of its Application for Mill Rejects of Uranium Ores

Cited by 23 publications

References 18 publications

Preparation and Mechanical Properties of Cemented Uranium Tailing Backfill Based on Alkali‐Activated Slag

Preparation and Mechanical Properties of Cemented Uranium Tailing Backfill Based on Alkali‐Activated Slag

Experimental study of high-flow and low-expansion backfill material

Understanding the microstructural evolution of hypersaline cemented paste backfill with low-field NMR relaxation

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