Valorization of mining waste and tailings through paste backfilling solution, Imiter operation, Morocco

Khaldoun, Abdelhadi; Ouadif, Latifa; Baba, Koji; Bahi, Lahcen

doi:10.1016/j.ijmst.2016.02.021

Cited by 45 publications

(15 citation statements)

References 9 publications

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“…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. Taking the actual mining conditions of Xinyang coal mine into account, the determined range of response optimization targets are illustrated in Table 5.…”

Section: Optimization Methodsmentioning

confidence: 99%

See 1 more Smart Citation

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%

“…Coal gangue backfill (CGB) not only solves the problems of ground gangue accumulation and fly ash pollution, but also effectively obviates surface subsidence and the induced gas leakage. In recent years, paste filling mining technology has been greatly popularized and broadly applied as a new green coal mining technology [3,4].…”

Section: Introductionmentioning

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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“…Goaf is prone to cause disasters such as overlying rock caving, surface subsidence, and goaf waterlogging, which seriously affect the safety of mine production. The preparation of phosphogypsum into filling materials for mine filling can not only maintain the stability of surrounding rocks, reduce the surface subsidence, and enhance the recovery of resources [25][26][27][28], but it can also completely solve the problem of phosphogypsum stockpiling and ensure the sustainable development of mines [29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Industrial Experiment of Goaf Filling Using the Filling Materials Based on Hemihydrate Phosphogypsum

Rong

Lan

2020

Minerals

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The surface stockpiling of phosphogypsum not only occupies a large amount of land, but also seriously harms the surrounding ecological environment. The preparation of phosphogypsum into filling materials for mine filling can not only maintain the stability of surrounding rock, reduce surface subsidence, enhance the recovery of resources, but it can also completely solve the problem of phosphogypsum stockpiling. Under certain activation conditions, hemihydrate phosphogypsum has a strong cementing property. It is an important way to reduce the filling cost by using hemihydrate phosphogypsum instead of cement as a cementing material. Through laboratory experiments, the filling materials based on hemihydrate phosphogypsum were developed. In order to further verify its feasibility in practical filling engineering, the industrial experiment of goaf filling was carried out in a phosphorus mine. The results show that the filling system was simple, reliable, and easy to operate and manage. The strength of the filling body basically reached the expected strength target of 2.5 MPa in 3 days. The consolidation speed of the filling materials was faster, which is beneficial to the safe underground construction of the mine. The results of the industrial experiment of goaf filling indicate that the filling materials based on hemihydrate phosphogypsum are suitable for mine filling engineering practice, the work amount is small, and the filling cost is low.

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“…In recent years, backfill mining methods have developed rapidly around the world [1][2][3][4], among which waste-rock backfill mining has become increasingly popular in the Chinese coal mining industry [5][6][7]. This method not only protects surface buildings, but also reduces environmental pollution caused by the large quantities of waste-rock material produced during roadway excavations and coal washing [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Deformation Characteristics of Waste-Rock Material in Underground Backfill Mining

Zhang

Zhao

et al. 2019

Minerals

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Waste-rock material used in underground backfill mining has a granular texture and acquires non-linear deformation characteristics when compressed. The deformation modulus of waste-rock measured by a laboratory compression test is significantly different from the true deformation modulus in the field, due to the complete confining effect of the loading steel cylinder. In this study, we performed a series of laboratory-based compression tests on waste-rock samples. The results showed that lab-acquired deformation modulus variations of waste rock could be divided into three stages: slow increase, accelerated increase, and rapid increase. We also measured the true deformation modulus of backfill waste rock by conducting a field test in gob areas of the Tangshan coal mine, China. The hardening process of backfill waste rock during the field test was analyzed, and could be divided into four stages: roof contact, rapid compression, slow compression, and long-term stable. With the increase of axial strain, the lab- and field-measured deformation moduli of waste rock both increased exponentially. A correction parameter was proposed to investigate the relationship between the field-generated true deformation modulus and the lab-tested deformation modulus. The correction parameter k positively correlated with the axial strain, in the form of an exponential function. The magnitude of k was between 0.5616 and 0.6531.

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Valorization of mining waste and tailings through paste backfilling solution, Imiter operation, Morocco

Cited by 45 publications

References 9 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

Industrial Experiment of Goaf Filling Using the Filling Materials Based on Hemihydrate Phosphogypsum

Experimental Research on Deformation Characteristics of Waste-Rock Material in Underground Backfill Mining

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