The Influence of Desiccation and Stress History on Monotonic and Cyclic Shear Response of Thickened Gold Tailings

Daliri, Farzad

doi:10.22215/etd/2013-10036

Cited by 8 publications

(14 citation statements)

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“…The lack of influence of crack development in the dry box was unexpected, as similar experiments with other types of tailings did reported some kind of influence in evaporation (Daliri, 2013;Innocent-Bernard, 2013;Rozina 2013). This difference in crack influence may be at least partially explained by the differences in crack geometry, as observed in Figure 176.…”

Section: Centrifuge Tailings Vs Different Type Of Tailingsmentioning

confidence: 75%

“…For the purpose of this experiment, factory calibrations were applied to all volumetric water content measurements. However, previous calibration experiments using gold tailings (Daliri, 2013) and thickened oil sands tailings (Innocent-Bemard, 2013) revealed low variation between the calibrated and measured data. Calibration results of Decagon T5E sensors for polymer-amended MFT and gold tailings can be found in Figure 22 and Figure 23, respectively.…”

Section: Dry Box Experiments Set Upmentioning

confidence: 86%

“…With respect to oil sand tailings, Innocent-Bernard (2013) showed that cracking is intimately linked with evaporation from Fluid Fine Tailings treated in a thickener; evaporation rates were shown to cycle from the potential rate down to a residual value as surface crust dried out, cracks subsequently formed, cracks dried out, and new cracks subsequently formed. By contrast, Daliri et al (2016Daliri et al ( , 2013 and showed that cracking in thickened gold tailings did not measurably affect the evaporative behavior. In all cases, however, evaporation at the surface at some point became limited by mass transport to the surface and salt formation.…”

Section: List Of Figuresmentioning

confidence: 90%

“…With the objective of studying the effects of cracks and salinity during tailings evaporation, Daliri (2013) deposited gold tailings into a drying experiment similar to this one at a gravimetric water content of 40%. Here, instead of classic evaporation behavior, declining stage I evaporation was observed ( Figure 6).…”

Section: Desiccation In Different Types Of Tailingsmentioning

confidence: 99%

“….................................................................45 Figure 18: Particle size distributions of centrifuge cake from hydrometer and sieve analysis with depth (Mizani, 2016) .........................................................................................................50 Figure 19: Oil sands tailings delivery. .........................................................................................51 Figure 20: Drum mixer (Model No DLM150VGD, Mixer Direct) ..................................................51 Figure 21: Dry box set up...........................................................................................................52 Figure 22: Specific calibrations for raw MFT and polymer-amended MFT (modified from Witteman, 2013) ...............................................................................................................53 Figure 23: Comparison of calculated VWC and VWC obtained by Decagon 5TE sensors(Daliri, 2013) .................................................................................................................................53 Figure 24: Schematic of sensor locations in dry box (Daliri, 2013). ............................................54 Figure 25: Decagon 5TE sensor (Decagon, 2016).…”

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confidence: 99%

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Desiccation and Consolidation in Centrifuge Cake Oil Sands Tailings

Hurtado¹

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Among the technologies available to the oil sands mining industry for processing Mature Fine Tailings (FFT) and improve deposits for reclamation, centrifuge treatment technology has had some success at larger scales. Optimization of centrifuge cake deposition requires knowledge of the various postdeposition dewatering mechanisms and their interactions. In order to study coupled evaporationconsolidation behavior of centrifuged tailings in some detail, a multilayer "dry box" deposition test was performed.Two thick (0.5m) and three thin (0.35m) layers of centrifuge oil sands tailings were deposited in a 0.7m by 1m "dry box", a steel reinforced Plexiglas box, and allowed to dry and consolidate while measuring gravimetric water content, total suction, osmotic suction, and drainage history. In addition, core samples analysis of each layer, a vane shear test, and the analysis of crack development were used to further assess their dewatering behavior. The influence of cracking on evaporation appears to be minimal, though this might be due to the aspect ratio of the drying box experiment. While evaporation rates remained near the potential rate for most of the tests, an eventual decline in evaporation rate appears to arise from high osmotic suctions generated by propagation of dissolved mass to the surface. In terms of dewatering optimization, results suggest that thin-lift deposition is somewhat more advantageous than thick-lift deposition, registering evaporation as the most influential water removal mechanism. However, these observations need to be evaluated by extending the results using numerical modeling and comparing them to field trials.

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Section: Centrifuge Tailings Vs Different Type Of Tailingsmentioning

confidence: 75%

Section: Dry Box Experiments Set Upmentioning

confidence: 86%

Section: List Of Figuresmentioning

confidence: 90%

Section: Desiccation In Different Types Of Tailingsmentioning

confidence: 99%

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Desiccation and Consolidation in Centrifuge Cake Oil Sands Tailings

Hurtado¹

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Geotechnical behaviour of layered paste tailings in shaking table testing

Alshawmar

Fall

2021

International Journal of Mining, Reclamation and Environment

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Dynamic response of thickened tailings in shaking table testing

Alshawmar

Fall

2021

Geo-Engineering

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In this study, an instrumented thickened tailings deposit model was designed, built and employed to evaluate the behaviour of layered thickened tailings to dynamic loading by using a shaking table equipment. The thickened tailings were deposited subsequently in three thin layers in a flexible laminar shear box mounted on top of the shaking table. Cyclic loading with a peak horizontal acceleration of 0.13 g and a frequency of 1 Hz was applied to the layered tailings deposit. Different types of sensors were placed to monitor the accelerations, displacements, volumetric water content and pore water pressures at the intermediate depth of each layer. Results indicated that the acceleration for the bottom and middle layers were similar to that of the base of the shaking table; but, this was not the case for the top layer. The measurements of vertical displacements indicated that all layers of thickened tailings experienced initially contraction and subsequently dilation during the shaking. The excess pore water pressure ratios were found to exceed unity through all layers of thickened tailings when the shaking ended. In other words, the results showed that the layered thickened tailings are susceptible to liquefaction under the considered testing conditions. It is also found that upward pore water migration to the top layer and downward pore water flow to the bottom layer occurred in the thickened tailings deposit. This water migration generated additional pore water pressure and also impacted the vertical displacement and liquefaction susceptibility of the thickened tailings material. The results of this study give a better understanding of the dynamic behaviour of thickened tailings, which is crucial for the safety of thickened tailings systems as well as sustainable mining.

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The Influence of Desiccation and Stress History on Monotonic and Cyclic Shear Response of Thickened Gold Tailings

Cited by 8 publications

References 0 publications

Desiccation and Consolidation in Centrifuge Cake Oil Sands Tailings

Desiccation and Consolidation in Centrifuge Cake Oil Sands Tailings

Geotechnical behaviour of layered paste tailings in shaking table testing

Dynamic response of thickened tailings in shaking table testing

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