Characterization and evaluation of the pozzolanic activity of granulated copper slag modified with CaO

Yan, Feng; Yang, Qingxiang; Chen, Qiusong; Andertun, Jakob Kero; Andersson, Anton; Ahmed, Hesham M.; Engström, Fredrik; Samuelsson, Caisa

doi:10.1016/j.jclepro.2019.06.062

Cited by 95 publications

(49 citation statements)

References 42 publications

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“…With the correct selection of the compositions and the method of pre-treatment of the raw mixtures, it is possible not only not to impair the physical-mechanical properties of Portland cement, but also to obtain materials with a higher level of the strength and other characteristics. Such an approach allows saving energy resources and improving the ecological situation without reducing the quality of the cement [54][55][56][57][58]. An additional positive effect from the point of view of increasing the strength of the cement stone can be achieved through the use of mechanical activation of the blended cement components [59][60][61][62][63].…”

Section: Blended Cements Prepared Using the Nepheline Concentrate Andmentioning

confidence: 99%

Binding Properties of Mechanically Activated Nepheline Containing Mining Waste

2020

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The development of apatite and rare-metal deposits of the Khibiny and Lovozero—the world’s largest ultrabasic massifs located in the Kola Alkaline Province—is accompanied by accumulation of huge amounts of sandy tailings dumps, about half consisting of nepheline. These tailings, on the one hand, pose a real threat of environmental pollution. On the other hand, they are “technogenic deposits” that contain reserves of valuable components (Na2O, K2O, Al2O3, etc.). In this paper, methods of processing of the nepheline-containing mining waste using mechanical activation to produce binding materials—geopolymers and blended cements—are observed. The advantages of combining the nepheline containing tailings dumps with other mining wastes accumulated in the region, such as Cu–Ni slag, are presented.

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Section: Blended Cements Prepared Using the Nepheline Concentrate Andmentioning

confidence: 99%

Binding Properties of Mechanically Activated Nepheline Containing Mining Waste

2020

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“…Slag-based cementitious materials generally have the advantages of corrosion resistance and high post-strength and can also solve the problems of expansion, strength reduction, and even disintegration of high-sulfur tailing aggregate filling body [14][15][16][17][18][19][20][21]. Geopolymer cementitious materials have a "crystal-like" structure consisting of circular molecular chains, which can segment metal ions and other toxic substances into cavities and which is one of the effective methods for toxic and nuclear waste treatment [22][23][24][25][26].…”

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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“…Cemented coal gangue backfill (CCGB) can be used to support overburden and prevent surface subsidence upon transportation through a pipeline to underground goaf [3][4][5]. CCGB can reuse solid waste and reduce landfill area, thus addressing environmental problems [6]. e CCGB for coal mine backfilling is an engineered mixture of coal gangue, fly ash, cement, and water; and the solids account for 75-85 wt% [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Corn Stalk Fly Ash (CSFA) on the Mechanical and Deformation Properties of Cemented Coal Gangue Backfill

Wang

Feng

et al. 2020

Advances in Materials Science and Engineering

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To reduce the amount of cement used in cemented coal gangue backfill (CCGB, a mixture of coal gangue, cement, fly ash, and water), mechanical and deformation properties of CCGB in which CSFA partially replaces the cement (0, 10, 20, 30, and 40 wt%) were studied. Compressive strength, acoustic emission during uniaxial loading, shear strength, and drying shrinkage were analysed. The compressive strength, shear strength, and drying shrinkage tests were performed at different curing times. The results showed that cemented coal gangue and corn stalk fly ash backfill (CGCAB) presented better performance, and the CGCAB with a 20% substitution rate had the best performance at day 28. Despite having the largest drying shrinkage value, 20% is the best choice for the substitution rate of CSFA. A 20% CSFA addition can enhance the bearing capacity of CGCAB and improve its failure mode, which is of great significance to support the upper overburden load and maintain the surface stability of the goaf.

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Characterization and evaluation of the pozzolanic activity of granulated copper slag modified with CaO

Cited by 95 publications

References 42 publications

Binding Properties of Mechanically Activated Nepheline Containing Mining Waste

Binding Properties of Mechanically Activated Nepheline Containing Mining Waste

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

Effects of Corn Stalk Fly Ash (CSFA) on the Mechanical and Deformation Properties of Cemented Coal Gangue Backfill

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