A practice of ultra-fine tailings disposal as filling material in a gold mine

Deng, Daiqiang; Liü, Lang; Yao, Zhou; Song, Ki-Il; Lao, Dezheng

doi:10.1016/j.jenvman.2017.02.056

Cited by 111 publications

(42 citation statements)

References 13 publications

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“…The bleeding rates of tested CSUTBs with 1:10 c/t are 31.56% (65% solids content), 16.90% (68% solids content), 14.23% (70% solids content), and 8.79% (73% solids content), respectively. The curves of the height of bleed water, varying with settlement time, are plotted in Figure 8.…”

Section: Effect Of Solids Content On Bleeding Rate Of Fresh Csutb Witmentioning

confidence: 99%

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Use of Cemented Super-Fine Unclassified Tailings Backfill for Control of Subsidence

et al. 2017

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Known for its advantages in preventing geological and environmental hazards, cemented paste backfill (CPB) has become a topic of interest for scientists and mining engineers in recent decades. This paper presents the results of a study on the use of cemented super-fine tailings backfill (CSUTB) in an underground mine for control of surface subsidence. An analytical solution is developed based on the available model to calculate the required strength of backfill when in contact with non-cemented tailings (NCT). The effect of solid contents on the rheological properties of CSUTB is investigated. A reasonable mix proportion (RMP) of CSUTB is determined for Zhongguan Iron Mine (ZGIM) based on laboratory experiments. The validity of RMP in surface subsidence control is verified by a 3D numerical model. The obtained results show that CSUTB requires higher strength when in contact with NCT than when in contact with orebody. Rheological characteristics, e.g., slump, fluidity, and bleeding rate of fresh CSUTB, decrease with higher solids content, of which values with a certain solids content can be determined by quadratic polynomial regression equations. RMP with a cement to tailings (c/t) ratio of 1:10 and a solids content of 70% is recommended for ZGIM, as it shows favorable mechanical and rheological abilities. The deformation parameters (curvature, inclination, and horizontal deformation rate) obtained from numerical modeling are acceptable and lower than critical values, meaning CSUTB can feasibly be used with RMP in subsidence control.

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Section: Effect Of Solids Content On Bleeding Rate Of Fresh Csutb Witmentioning

confidence: 99%

“…Compared with coarse tailings, SFT involves slow-settling, unreasonable particle size distribution and special chemical composition [16]. Few studies have been conducted to evaluate the effect of fine tailings on the quality of CPB.…”

Section: Introductionmentioning

confidence: 99%

Use of Cemented Super-Fine Unclassified Tailings Backfill for Control of Subsidence

et al. 2017

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“…The mining of underground mineral resources easily causes damage to the overlying strata, which results in irreparable destruction to the aquifer and some mineral resources that the current technology cannot exploit [1][2][3][4][5][6]. Moreover, the surface subsidence that occurs degenerates the plantable land, and large amounts of gangues and tailings are produced that waste land resources and pollute the environment [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

Minerals

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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.

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“…e production of Portland cement clinker requires a large amount of fine-grained siliceous materials, where the conventional siliceous materials used in the preparation of cement clinker are prepared by crushing and grinding sandstone to a specific level of granularity. e main component of gold ore tailings is silicon dioxide, and gold ore tailings have a very fine particle size [24], which is quite close to the requirements for the raw materials of cement plants. us, it is possible to use gold ore tailings as a siliceous raw material for the production of Portland cement.…”

Section: Introductionmentioning

confidence: 83%

Preparation of Portland Cement with Gold Ore Tailings

Wang

Yao

Zhu

et al. 2019

Advances in Materials Science and Engineering

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e disposal of gold ore tailings (GTs) has been a very difficult problem for a long time. us, this study explored a new approach to the management of GTs by preparing Portland cement. Physical properties, reaction mechanisms, and hydration product types of cement prepared with GTs (C-GTs) and ordinary Portland cement (C-SS) were compared. X-ray diffraction (XRD), thermogravimetric (TG), and scanning electron microscope energy-dispersive spectroscopy (SEM-EDS) analysis techniques were used to study the mineralogical phases of the clinker and raw materials, hydration product types, and microtopography. e consistency, setting time, flexural strength and compressive strength values of the cement samples (C-GTs and C-SS), and burnability of the raw materials were also studied. e burnability analysis indicated that GTs provided a higher reactivity. e XRD results showed that the clinker phases of the C-GTs were C 3 S, C 2 S, C 3 A, and C 4 AF. e XRD, TG, and SEM-EDS results showed that the hydration products were flaky calcium hydroxide, rod-shaped ettringite, and granular C-S-H gels. Its compressive strength and flexural strength were, respectively, 30.4 MPa and 6.1 MPa at the curing age of 3 days and 59.1 MPa and 9.8 MPa at the curing age of 28 days, which were slightly higher than those of the C-SS. Furthermore, the results showed that the consistency, initial setting time, and final setting time for the two kinds of cement were similar, which further suggested that GTs could be used to prepare Portland cement.

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A practice of ultra-fine tailings disposal as filling material in a gold mine

Cited by 111 publications

References 13 publications

Use of Cemented Super-Fine Unclassified Tailings Backfill for Control of Subsidence

Use of Cemented Super-Fine Unclassified Tailings Backfill for Control of Subsidence

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

Preparation of Portland Cement with Gold Ore Tailings

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