Experimental characterization of the influence of tailings fineness and density on the quality of cemented paste backfill

Fall, Mamadou; Benzaazoua, Mostafa; Ouellet, Serge

doi:10.1016/j.mineng.2004.05.012

Cited by 304 publications

(96 citation statements)

References 2 publications

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“…After sampling, the drying [19] of unclassified tailings was carried out under standard conditions, before being kept in a safe space (Figure 1). It is known that the physicochemical properties of unclassified tailings play an important role in the application of CPB [9][10][11]. Hence, the chemical composition was measured by the titrimetric method and particle size distribution was tested by one laser particle size analyzer (Malvern Instruments Ltd., Malvern, UK), which was conducted in Chemical Composition Analysis Center, Central South University.…”

Section: Tailingsmentioning

confidence: 99%

“…Filling the goafs with tailings seems to be an ideal solution [5], with cemented paste backfill (CPB) being widely and intensively employed in the global mining industry [6][7][8]. The physicochemical properties of unclassified tailings play an important role in the application of CPB [9][10][11], such as strength, hardening performance and pipeline transportation. Having a large proportion of fine particles makes it difficult to harden the tailings backfill body.…”

Section: Introductionmentioning

confidence: 99%

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Rational Utilization of Fine Unclassified Tailings and Activated Blast Furnace Slag with High Calcium

2017

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Abstract:The utilization of cemented tailings/paste backfill (CPB) by the mining industry is becoming increasingly important. However, it has been difficult to analyze the economic usage of CPB for fine unclassified tailings. Therefore, the physical and chemical properties of fine unclassified tailings, sampled from the Sijiaying Mine, were first analyzed in this study. After this, active excitation of blast furnace slag was examined, with a cement mixture made up of slag, lime, plaster and cement being used to conduct the physicochemical evaluations and proportioning tests. These results were compared with those from ordinary cement. It was revealed that the cement mixture can effectively harden the unclassified tailings. The cement mixture specimens have good performance in early strength, with the seven-day strength being about twice as high as ordinary cement, which meets the requirements for efficient continuous mining. This strength was reduced after 10 days due to expansion and complicated reactions, with an average reduction of 11.8% after 28 days under recommended and better conditions. In addition, analysis of the microstructures was carried out to observe the hydration products and the change in strength. Furthermore, fluidity characteristics of the slurry were measured, with the slurry found to have a mass fraction of 70%-72% in addition to containing an ideal fluidity and a paste-like flow state. Considering the mining conditions, the aggregates with a tailings-cement ratio of 6:1 and a mass fraction of 70%-72% are recommended as high-strength CPB, which should be used for the surface layer and safety pillars. In addition, backfilling materials with a tailings-cement ratio of 15:1 and a mass fraction of 70%-72% are recommended as low-strength CPB, which should be used as ordinary CPB to achieve economic benefits. The application cases showed that the cement mixture is suitable for utilization of unclassified tailings with regards to safety, economics and efficiency.

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Section: Tailingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rational Utilization of Fine Unclassified Tailings and Activated Blast Furnace Slag with High Calcium

2017

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“…The mechanical, hydraulic, and environmental behavior of CPB has been investigated by numerous researchers (Landriault et al 1997;Zou and Li 1999;Belem et al 2000;Belem et al 2001;Benzaazoua et al 2004;Fall et al 2005Fall et al , 2008Kesimal et al 2005;Klein and Simon 2006;Ouellet et al 2006;Ouellet et al 2007;Benzaazoua et al 2008;Ercikidi et al 2009;Yeheyis et al 2009;Nasir and Fall 2010;Zhang et al 2011;Ercikidi et al 2013). In general, addition of a cementitious binder has been shown to increase strength, reduce hydraulic conductivity, increase pH of the effluent, and stabilize heavy metals present in mine tailings.…”

Section: Problem Statementmentioning

confidence: 99%

“…The majority of research has been focused on understanding factors affecting the mechanical properties of tailings-binder mixtures (e.g., Landriault, 1995;Belem et al 2000;Kesimal et al 2004;Benzaazua et al 2004;Fall et al 2005Fall et al , 2007Mahmood and Mulligan 2010;Yilmaz et al 2011), and only a limited number of studies have focused on understanding factors affecting hydraulic conductivity of tailings-binder mixtures. Recent work has focused on the effects of water to binder ratio (Jones et al 2001;Godbout et al 2007;Fall et al 2009) and curing time (Belem et al 2001;Godbout et al 2007;Celestin et al 2008;Fall et al 2009;EL Mkadmi et al 2013;Ghirian and Fall 2013) on the hydraulic properties of fly ash-amended mine tailings.…”

Section: Problem Statementmentioning

confidence: 99%

Hydraulic Conductivity of Fly Ash-Amended Mine Tailings

Alhomair

2016

Geotech Geol Eng

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HYDRAULIC CONDUCTIVITY OF FLY ASH-AMENDED MINE TAILINGSThe objective of this study was to evaluate the effect of fly ash addition on hydraulic conductivity (k) of mine tailings. Fly ash-amended mine tailings have potential application as construction materials in active mines, transportation earthworks, and other geotechnical engineering projects. Addition of cementitious binder (fly ash) to mine tailings has the potential to reduce hydraulic conductivity and enhance contaminant sequestration to be feasible in earthwork projects. Mine tailings used in this study were categorized as synthetic tailings and natural tailings. Natural tailings were collected from a garnet mine located in the U.S. Two synthetic mine tailings were developed via blending commercially-available soils to create typical particle-size distributions and plasticity characteristics of actual mine tailings. The two types of fly ash used classified as off-specification, but had sufficient calcium oxide (CaO) content (17% and 18.9%) for pozzolanic activity.

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“…[7], Swami et al [8], Onuaguluchi and Eren [9], Das et al [10], Ugama et al [11] and Sabat et al [12] attempted to investigate the applicability of using tailings as substitutes to traditional building materials. While others like Belem and Benzaazoua [13], Fall et al [14], Fall et al [15], Benzaazoua et al [16], Ercikdi et al [17], Fall and Pokharel [18], Ercikdi et al [19], Helinski et al [20] and Helinski et al [21] investigated the use of different mine tailings in the most traditional manner by using them as cemented paste backfill. The tailings, in many of these studies, have been mixed with cement to solidify and increase their effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Multiple Regression Analysis of Unconfined Compression Strength of Mine Tailings Matrices

Mahmood¹,

Elektorowicz

2017

MATEC Web Conf.

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Abstract. As part of a novel approach of sustainable development of mine tailings, experimental and numerical analysis is carried out on newly formulated tailings matrices. Several physical characteristic tests are carried out including the unconfined compression strength test to ascertain the integrity of these matrices when subjected to loading. The current paper attempts a multiple regression analysis of the unconfined compressive strength test results of these matrices to investigate the most pertinent factors affecting their strength. Results of this analysis showed that the suggested equation is reasonably applicable to the range of binder combinations used.

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Experimental characterization of the influence of tailings fineness and density on the quality of cemented paste backfill

Cited by 304 publications

References 2 publications

Rational Utilization of Fine Unclassified Tailings and Activated Blast Furnace Slag with High Calcium

Rational Utilization of Fine Unclassified Tailings and Activated Blast Furnace Slag with High Calcium

Hydraulic Conductivity of Fly Ash-Amended Mine Tailings

Multiple Regression Analysis of Unconfined Compression Strength of Mine Tailings Matrices

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