Mix proportioning of underground cemented tailings backfill

Fall, Mamadou; Benzaazoua, Mostafa; Saa, E.G.

doi:10.1016/j.tust.2006.08.005

Cited by 275 publications

(96 citation statements)

References 12 publications

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“…This optimization is based on Multi-criteria decision-making principles according to Derringer and Suich [23]. This method is based on construction of a satisfaction function for each individual model response, as expressed in Equation (4) and Equation (5) [22,24]. According to Equation (4), larger values of UCS 28 and the plastic viscosity are desirable; while according to Equation (5), smaller value of yield stress is expected in optimization.…”

Section: Optimization Methodsmentioning

confidence: 99%

175 Mix Ratio Optimization of Cemented Coal Gangue Backfill (CGB) Based on Response Surface Method

Feng¹,

Li²,

Yao³

et al. 2016

JRST

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Central composite design (CCD) experiments were performed to investigate the effect of cement content, fine gangue rate and water reducer content on the rheological properties of fresh cemented coal gangue backfill (CGB) and the compressive strength of hardened slurry. The parameter of mixture proportion was optimized by Multi-criteria optimization analysis. The results show that the fresh CGB rheological property conforms to Bingham model, the yield stress of fresh slurry is influenced by the interaction of the three factors, and the plastic viscosity increases with cement content, fine gangue rate and water reducer content. The value of 28 days uniaxial compressive strength (UCS 28 ) is proportional to cement content and water reducer content, while it is inversely proportional to fine gangue rate. The overall satisfaction of slurry rises significantly with the increase of water reducer content. However, it increases firstly and then decreases with the increase of cement content and fine gangue rate, and reaches a maximum at cement content of 210 kg/m 3 and fine gangue rate of 40%. The developed design method can provide scientific reference to reduce the accumulation of waste residues.

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Section: Optimization Methodsmentioning

confidence: 99%

175 Mix Ratio Optimization of Cemented Coal Gangue Backfill (CGB) Based on Response Surface Method

Feng¹,

Li²,

Yao³

et al. 2016

JRST

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“…The proportion of CPB plays an important role in strength and other characteristics [30,31]. The specimens were prepared by mixing a binder mixture, ordinary cement, unclassified tailings and neutral water timely.…”

Section: Specimens and Curing Conditionsmentioning

confidence: 99%

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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“…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%

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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Mix proportioning of underground cemented tailings backfill

Cited by 275 publications

References 12 publications

175 Mix Ratio Optimization of Cemented Coal Gangue Backfill (CGB) Based on Response Surface Method

175 Mix Ratio Optimization of Cemented Coal Gangue Backfill (CGB) Based on Response Surface Method

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

Hydraulic Conductivity of Fly Ash-Amended Mine Tailings

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