Mill tailings based composites as paste backfill in mines of U-bearing dolomitic limestone ore

Panchal, Sandeep; Deb, Debasis; Sreenivas, T.

doi:10.1016/j.jrmge.2017.08.004

Cited by 47 publications

(15 citation statements)

References 38 publications

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“…From Fig. 7 c, d, it was visible that tailings treated with CE and FA have developed needle-shaped morphology, typical of the hydrated cement paste phases, suggesting the formation of C-S-H and ettringite (Panchal et al 2018 ). In addition, typical spherical shaped fly ash particles are observed in CE-FA446, Fig.…”

Section: Resultsmentioning

confidence: 99%

The formation of unsaturated zones within cemented paste backfill mixtures—effects on the release of copper, nickel, and zinc

Hamberg

Maurice

Alakangas

2018

Environ Sci Pollut Res

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Flooding of cemented paste backfill (CPB) filled mine workings is, commonly, a slow process and could lead to the formation of unsaturated zones within the CPB fillings. This facilitates the oxidation of sulfide minerals and thereby increases the risk of trace metal leaching. Pyrrhotitic tailings from a gold mine (cyanidation tailing (CT)), containing elevated concentrations of nickel (Ni), copper (Cu), and zinc (Zn), were mixed with cement and/or fly ash (1–3 wt%) to form CT-CPB mixtures. Pyrrhotite oxidation progressed more extensively during unsaturated conditions, where acidity resulted in dissolution of the Ni, Cu, and Zn associated with amorphous Fe precipitates and/or cementitious phases. The establishment of acidic, unsaturated conditions in CT-CBP:s with low fractions (1 wt%) of binders increased the Cu release (to be higher than that from CT), owing to the dissolution of Cu-associated amorphous Fe precipitates. In CT-CPB:s with relatively high proportions of binder, acidity from pyrrhotite oxidation was buffered to a greater extent. At this stage, Zn leaching increased due the occurrence of fly ash-specific Zn species soluble in alkaline conditions. Irrespective of binder proportion and water saturation level, the Ni and Zn release were lower, compared to that in CT. Fractions of Ni, Zn, and Cu associated with acid-soluble phases or amorphous Fe precipitates, susceptible to remobilization under acidic conditions, increased in tandem with binder fractions. Pyrrhotite oxidation occurred irrespective of the water saturation level in the CPB mixtures. That, in turn, poses an environmental risk, whereas a substantial proportion of Ni, Cu, and Zn was associated with acid-soluble phases.

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Section: Resultsmentioning

confidence: 99%

The formation of unsaturated zones within cemented paste backfill mixtures—effects on the release of copper, nickel, and zinc

Hamberg

Maurice

Alakangas

2018

Environ Sci Pollut Res

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“…Uranium tailings are taken from a uranium tailings reservoir in China, with water content of 10.91%, density of 2.55 t/m 3 , and volume density of 1.375 t/m 3 . e main chemical composition of experimental materials is shown in Table 1 (by XRF of PANalytical Axios), and the pH of uranium tailings was 5.29 by referring to "Soil quality-determination of pH" [27].…”

Section: Test Materialsmentioning

confidence: 99%

“…Surface stacking is one of the most important disposal methods of uranium tailings, in which radioactive and nonradioactive materials migrate and disperse under the action of weathering leaching, causing pollution to soil, water, and air. However, as a kind of long-lived, largevolume and low (or extremely low) level radioactive solid waste, uranium tailings cannot be completely treated in the way of high (or medium) level radioactive solid waste disposal [1][2][3][4][5]. In the field of filling mining, paste filling has the characteristics of "no precipitation, no bleeding, and no segregation" and can effectively control the diffusion of harmful components in filling materials in groundwater, which is consistent with the principle of cement solidification method in radioactive solid waste [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Mechanical Properties of Cemented Uranium Tailing Backfill Based on Alkali‐Activated Slag

Wang

Chen

et al. 2020

Advances in Materials Science and Engineering

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Backfilling disposal based on cement solidification is one of the ways to solve the environmental and safe problems of uranium tailing surface stacking. Alkali-activated slag, especially sodium silicate activated geopolymer, has become the preferred cementing material for the uranium tailing backfilling system because of its advantages of corrosion resistance and high strength. In this paper, uranium tailings and slag are taken as research objects, and the unconfined compressive strength (UCS) is taken as the main quality index. The preparation method of the cemented uranium tailing backfill based on alkali-activated slag was studied, hereinafter referred to as CUTB. The effects of additive amount, activator amount and activator modulus on the strength of CUTB were investigated. The results show that alkali-activated slag is an effective cementing material for the backfilling system of uranium tailing aggregate. The maximum UCS of 28 d age in the test groups is 16.45 MPa. Quicklime is an important additive for preparing CUTB. When the amount of quicklime is 0%, the early and late strengths of the filling body cannot be measured or at a very low level. At the age of 7 d, the order of each factor is additive amount > activator modulus > activator amount, but at the age of 28 d, the order of each factor is additive amount > activator amount > activator modulus. The test results can provide a basis for choosing cementitious materials for backfilling disposal of uranium tailings.

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“…Various tailings management methods have been employed at modern mines worldwide to limit finite resource consumption and prevent environmental pollution [25][26][27]. For example, solid tailings have been used to fabricate bricks, ceramic tiles, mortars, alkaliactivated materials, geopolymers, and mine backfill [28][29][30][31][32][33]. As a means to re-use materials, tailings have been used in backfill at the industrial scale as an ingredient in paste backfill for underground mines [34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

The Potential Re-Use of Saudi Mine Tailings in Mine Backfill: A Path towards Sustainable Mining in Saudi Arabia

et al. 2021

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The Kingdom of Saudi Arabia covers an area of approximately 2 million km2 and is rich in natural resources that are necessary for industrial development. The estimated mineral wealth beneath the Kingdom’s soil is approximately USD 1.33 trillion, as reported by the Ministry of Industry and Mineral Resources. The Kingdom’s vision for 2030 is to develop the mining sector to become the third pillar of the domestic economy. Therefore, exploration and mining activities are expected to accelerate over the next decade, which will lead to increased waste production. New executive regulations issued in January 2021 contain several sustainable elements related to the environment, social responsibility, and occupational health and safety. Therefore, this study aims to promote an example of sustainable mining activities in the Kingdom that could be adapted to meet the regulatory requirements. Cemented paste backfill samples of varying composition were made with waste materials from a Saudi copper mine for re-injection into underground mining cavities to minimize waste exposure to the environment. The samples were tested for unconfined compressive strength (UCS) after 7, 14, 28, 56, and 90 days of curing. Results from a statistically designed experiment technique show that the samples developed sufficient strength to be used in mine backfilling applications. Strong negative relationships were detected between the UCS and the water-to-binder ratio. There is strong potential for mine backfill technology to be applied to a wide range of Saudi Arabian mines to enhance the sustainability of the mining sector.

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Mill tailings based composites as paste backfill in mines of U-bearing dolomitic limestone ore

Cited by 47 publications

References 38 publications

The formation of unsaturated zones within cemented paste backfill mixtures—effects on the release of copper, nickel, and zinc

The formation of unsaturated zones within cemented paste backfill mixtures—effects on the release of copper, nickel, and zinc

Preparation and Mechanical Properties of Cemented Uranium Tailing Backfill Based on Alkali‐Activated Slag

The Potential Re-Use of Saudi Mine Tailings in Mine Backfill: A Path towards Sustainable Mining in Saudi Arabia

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