Utilization of water-reducing admixtures in cemented paste backfill of sulphide-rich mill tailings

Erçıkdı, Bayram; Cihangir, Ferdi; Kesimal, Ayhan; Deveci, Hacı; Alp, İbrahi̇m

doi:10.1016/j.jhazmat.2010.03.096

Cited by 111 publications

(27 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Particle size distribution, as the most significant physical characteristic of fill material of tailings, was analyzed using a Mastersizer2000 laser particle size analyzer (Malvern, Shanghai, China); the results are summarized in Figure 5 and Table 2. Table 2 indicates that the tailings of ZGIM can be classified as super fine tailings since more than 60 wt % of the sample was finer than 20 µm and its maximum diameter is only 211 µm [39]. The portion of tailings finer than 20 µm plays an important role in paste pumpability [15].…”

Section: Tailingsmentioning

confidence: 99%

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

et al. 2017

View full text Add to dashboard Cite

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.

show abstract

Section: Tailingsmentioning

confidence: 99%

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

et al. 2017

View full text Add to dashboard Cite

show abstract

“…As low as 7° internal friction angle was measured from 360 days curing CPB specimens with 5% cement ratio. Mixes with silt dominant particle size distribution, ∼77% solid (cement+tailings) content including 5-7% cement in solid and ∼23% water content by weight, which were tested in this study are typical CPB materials [28][29][30][31][32][33][34][35][36]. As 25 o was found to be a practically acceptable value of internal friction angle for CPB materials having no longer curing time than the period for start of the sulphate attack, cohesion values of CPB materials can be estimated using Equation 3 for different UCS values.…”

Section: Discussionmentioning

confidence: 99%

An Experimental Study on Shear Strength of Cemented Paste Backfill Materials

Komurlu¹,

Turan²,

Cihangir³

et al. 2017

SDÜ Fen Bil Enst Der

View full text Add to dashboard Cite

Change in the mechanical parameters of cohesion and internal friction angle with variations in cement content and curing time of cemented paste backfill (CPB) materials was investigated carrying out a series of experimental study. In this scope, shear strength and uniaxial compressive strength (UCS) tests were performed to find out the failure properties of CPB samples. According to the results obtained from this study, a new factor is suggested to use in the MohrCoulomb failure criterion to better fit the envelope for CPB materials. As an important issue from this study, strength values of curing CPB specimens were found to dominantly increase because of the improvement in cohesion values instead of internal friction angle. With an increase in cement content, strength values were measured to increase because of the improvement in both internal friction angle and cohesion parameters. Additionally, start of decrease in strength values due to the sulphate attack was found be postponded as another advantage of the increase in cement content. Çimentolu Macun Dolgu Malzemelerinin Makaslama Dayanımı Üzerine Deneysel Bir ÇalışmaAnahtar Kelimeler Makaslama dayanımı, Mekanik parametreler, Çimentolu macun dolgu, Maden dolgusu, Yeraltı madenleri Özet: Bu çalışmada, çimento miktarı ve kür süresinin madencilikte kullanılan çimentolu macun dolgu malzemelerinin kohezyon ve içsel sürtünme açısı değerleri üzerindeki etkileri bir dizi deneysel çalışma ile incelenmiştir. Macun dolgu malzemelerinin yenilme özelliklerinin belirlenmesi için makaslama ve tek eksenli sıkışma dayanımı testleri gerçekleştirilmiştir. Elde edilen sonuçlara göre, MohrCoulomb yenilme ölçütünün çimentolu macun dolgu malzemeleri için kullanımına yönelik yeni bir katsayının kullanımı önerilmiştir. Çalışmanın önemli çıktılarından bir diğeri olarak, kür süresinin artışı neticesinde dayanım değerlerindeki iyileşmenin içsel sürtünme açısı nedeni ile değil, baskın olarak kohezyon değerlerindeki artıştan kaynaklandığı belirlenmiştir. Çimento miktarındaki artış sebebi ile hem içsel sürtünme açısı hem de kohezyon değerlerinde artış olduğu görülmüştür. Ayrıca, sülfat atak kaynaklı dayanım değerlerindeki azalmanın çimento miktarındaki artış neticesinde gecikerek daha uzun kür sürelerinde yaşandığı belirlenmiştir.

show abstract

“…Maple-wood filler, Nano-silica, fly-ash, granulated blast-furnace slag (GBFS) and silica fume were added into CPB as partial binding agent to improve its mechanical performance [19][20][21][22][23]. Ercikdi et al [24] reported the influence of different WRAs on rheology and short and long term performance of CPB. Li and Fall [25] observed that sulphate has negative effect on strength, intensity and rate of self-desiccation of the CPB in early curing time.…”

Section: Introductionmentioning

confidence: 99%

Strength Characteristics and Failure Mechanism of Cemented Super-Fine Unclassified Tailings Backfill

et al. 2017

View full text Add to dashboard Cite

This experimental study investigates the strength characteristics of cemented super-fine unclassified tailings backfill (CSUTB) and its failure mechanism. Physical and chemical properties of tailings from the Zhongguan Iron Mine (ZGIM) were tested. A series of uniaxial compressive strength (UCS) tests was conducted to determine the relationships between UCS of CSUTB and three factors of cement-tailings ratio (CTR), solid content and curing time. Gray relational analysis (GRA) method was then used to study the sensitivity of UCS to these three factors. Results indicate that ZGIM unclassified tailings is a kind of alkaline super-fine tailings with high activity and quality. UCS of CSUTB increases exponentially with the increase of CTR and solid content, and increases linearly with curing time. The curing time is the most important factor for the UCS of CSUTB, followed by CTR and solid content. The stress-strain curves obtained from UCS tests show the failure process of CSUTB, including four stages of initial deformation, linear elastic, yield deformation and complete failure. It is the result of damage evolution.

show abstract

Utilization of water-reducing admixtures in cemented paste backfill of sulphide-rich mill tailings

Cited by 111 publications

References 23 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

An Experimental Study on Shear Strength of Cemented Paste Backfill Materials

Strength Characteristics and Failure Mechanism of Cemented Super-Fine Unclassified Tailings Backfill

Contact Info

Product

Resources

About