Influence of disposal configurations on hydrogeological behaviour of sulphidic paste tailings: A field experimental study

Yilmaz, Erol; Benzaazoua, Mostafa; Bussière, Bruno; Pouliot, Sandra

doi:10.1016/j.minpro.2014.08.004

Cited by 59 publications

(20 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, cemented tailings backfill (CTB) or cemented paste backfill (CPB) represents nearly 50-85% of the total operating costs when considered for a cement content of 3.5-9% used in the backfill mix. CTB allows mining companies to extract more ore in a secure manner, while simultaneously improving working and environmental conditions [4,5]. As a result, the use of solid wastes is an effective approach to reduce mining costs, improve operational safety, and develop a new type of cementitious material with a relatively low cost and high mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag

et al. 2018

Self Cite

View full text Add to dashboard Cite

With the use of glauberite mineral (GM) and sodium hydroxide (SH) alkaline catalysts to stimulate slag powder’s internal cementation activity and incorporate the two fine-grained solid wastes, such as quicklime (Q) and desulfurized ash (DA), a new cementitious material suitable for mine tailings was developed to replace traditional ordinary Portland cement (OPC) for reducing cement-related costs. A series of uniaxial compressive strength (UCS) tests were carried out on cemented tailings backfill (CTB) samples containing different activators. The results showed that (1) the highest UCS values of 14-day and 28-day cured CTB samples were 1.259 MPa and 2.429 MPa, respectively, and the effect of different activator types was in the order of SH > GM > DA > Q and SH > GM > Q > DA; (2) the relationship between UCS and activator dosages followed the function y = ax3 − bx2 + cx − d. Compared with the OPC 32.5 R cemented samples, the minimum strength growth factor was 1.45, and the maximum reached 2.03; (3) the optimal proportion of DA slag formula was 4.5% or 5.0% Q, 19% DA, 2.5% GM, and 0.7% SH. The aforesaid new cementitious materials met the mine’s UCS requirements with a relatively low cost (17.04–17.20 €/ton) and solved the stacking problem of solid wastes on the surface well. Ultimately, this study provides a useful reference for the development of mineral binders.

show abstract

Section: Introductionmentioning

confidence: 99%

Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…The mechanical stability of cemented waste rock under compression is usually of concern, as it is under pressure throughout the service period [14][15][16], mainly from four aspects: cementing materials, aggregate particles, additive materials, and environmental conditions. (1) In cementing materials (including its type, content, and even the mixed formulation of multiple cementing materials), it is believed that the mechanical parameters of cemented waste rock can be increased by improving its bonding performance [17][18][19][20]; (2) In aggregate particles, which include particle composition, content, and particle size distribution, it is considered that the internal structure of backfill can be strengthened by reducing the elements that can deteriorate the hydration product and optimize the spatial distribution of the particles [21][22][23][24][25][26][27][28][29][30][31][32][33]; (3) In additive materials, including nanomaterials, polymers, fibers, alkaline substances, and water-absorbing substances, it is believed that the hydration process can be improved, the formation of hydration products can be promoted, and even more reliable links can be generated at the cement-rock boundaries to optimize the loading structure of backfill [34][35][36][37][38][39][40][41][42]; (4) In environmental conditions, including temperature, corrosion, conservation, and stress field, it is considered that creating more favorable environmental conditions can improve the mechanical properties of cemented waste rock [43][44]…”

Section: Introductionmentioning

confidence: 99%

Particle Size Distribution of Cemented Rockfill Effects on Strata Stability in Filling Mining

et al. 2018

Minerals

View full text Add to dashboard Cite

It is of great significance for engineering safety, economic benefits, environmental protection, and sustainable development to investigate the strata stability in filling mining with cemented rockfill. Consequently, this paper is based on a specific coal mine where we applied the fully-mechanized longwall mining and filling and designed a cemented rockfill material for which the particles satisfied the Talbot gradation. Uniaxial and triaxial compression experiments were carried out on the cemented rockfill specimen, which obtained the relations between the mechanical parameters (Poisson ratio, elastic modulus, compressive strength, cohesive force, internal friction angle, and tensile strength) and the particle size distribution of the aggregate. The excavation and filling processes in the coal seam were simulated based on the numerical software FLAC3D. The characteristics of the displacement and stress fields of the strata when the goaf was filled by cemented rockfill with different granule gradations were discussed. The influences of the particle size distribution and mining distance on the maximum subsidence displacement of the coal seam roof, internal stress of the backfill, and the stress of the rock mass in the coalface were analyzed. The feasibility and effectiveness of the filling mining with cemented rockfill to protect the integrity of the overlying strata were discussed. The results showed that optimizing the particle size distribution of the aggregate in cemented rockfill could increase the loading capacity of the backfill to improve the filling effect, effectively control the strata movement, and decrease the stress of rock mass in the coalface to reduce the potential danger.

show abstract

“…is new technology, also known as RCTMC, was developed on the basis of waste rock mixed with cemented tailings backfill, and offers various operational, technical, and environmental advantages. It appreciably reduces mining waste emissions, effectively improves compressive strength, and stability of the backfill material, and greatly save the backfill-related preparation and operational costs [20][21][22]. e mechanical strength characteristics of RCTMC samples should be investigated after the filling slurry is fully mixed on surface backfilling station and delivered into the underground goaf to come into contact with rock.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Acoustic Emission and Triaxial Mechanical Properties of Rock-Cemented Tailings Matrix Composites

Cao

Yilmaz

Song

et al. 2019

Advances in Materials Science and Engineering

Self Cite

View full text Add to dashboard Cite

Acoustic emission (AE) test is a powerful technique for examining the sounds of cracks growing, breaking, and other modes of damage in cementitious materials deforming under stress, such as rock-cemented tailings matrix composites (RCTMC). RCTMC, an engineered mixture of tailings, cement, rock, and water, is widely used to fulfill numerous important roles at underground mine sites as a construction material and a ground support tool. To study the mechanical strength and AE properties of RCTMC, compression testing was carried out using a triaxial compression test system (TAW-2000) and AE monitoring system (PCI-2), and the failure modes of samples were also examined. Results have shown that (1) the failure process of RCTMC samples can be divided into six main stages: compaction, linear elastic characteristic, crack growth, primary damage development, cemented tailings backfill withstand stress zone, and secondary damage development stage. CTB has the strengthening effect on mechanical strength of rock; (2) the AE process can be also divided into six main stages: the prepeak quiescence period, the elastic energy reserve period, the first destruction development AE area, the secondary energy reserve period, the second damage development stage, and the postpeak calm period; and (3) samples' cumulative ring count is "stepped" distribution over time, and the ring count has entered the postpeak flat stage after many active periods. e process of RCTMC samples from tensile to shear failure mode is represented by numerical simulation. Finally, the obtained experimental results can offer a useful reference for the further study of the mechanism of the surrounding rock and cemented tailings backfill structure.

show abstract

Influence of disposal configurations on hydrogeological behaviour of sulphidic paste tailings: A field experimental study

Cited by 59 publications

References 34 publications

Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag

Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag

Particle Size Distribution of Cemented Rockfill Effects on Strata Stability in Filling Mining

Assessment of Acoustic Emission and Triaxial Mechanical Properties of Rock-Cemented Tailings Matrix Composites

Contact Info

Product

Resources

About