Modification of glass structure via CaO addition in granulated copper slag to enhance its pozzolanic activity

Yan, Feng; Chen, Qiusong; Zhou, Yanlong; Yang, Qingxiang; Zhang, Qinli; Jiang, Liang; Guo, Haoxu

doi:10.1016/j.conbuildmat.2019.117970

Cited by 56 publications

(10 citation statements)

References 48 publications

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“…In this case, the optimal test was group 4 and the strength of 28 d age was only 0.23 MPa. is is similar to the conclusion of papers [17,19]. When the activator modulus is low, the filling slurry is prone to rapid coagulation.…”

Section: Orthogonal Analysis Of Strength Characteristics Of Cutbsupporting

confidence: 89%

“…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%

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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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Section: Orthogonal Analysis Of Strength Characteristics Of Cutbsupporting

confidence: 89%

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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“…e particle size distribution and other physical properties of tailings are presented in Figure 2 and Table 2. As described in Figure 2, the particles smaller than 19 μm account for 30.40 wt.%, which makes it impossible to realize tailing dewatering by self-gravity, even if ignoring the sodium silicate [30,31].…”

Section: Methodsmentioning

confidence: 99%

Design and Application of Rapid Dewatering for Tailings Containing Sodium Silicate: Laboratory and Industrial Test Results

Guo-Quan

Ke-ping

Kang

et al. 2020

Advances in Materials Science and Engineering

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Focusing on the tailings containing high sodium silicate (water glass), this study conducted laboratory experiments and semi-industrial tests of flocculation and sedimentation for rapid tailings dewatering. Various reagent combinations, lime and anionic flocculant (APAM) (L&A), sulfuric acid and APAM (S&A), and calcium chloride and APAM (C&A), were tested. The results show that (i) all the three combinations presented a good effect in the laboratory experiments, and the relatively optimum dosages were L&A of 2 kg/t & 30 g/t, S&A of 2.6 kg/t & 20 g/t, and C&A of 3 kg/t & 30 g/t. (ii) The overflow water of the L&A group became turbid after 10 hours, and the pH increased to 14. While, for the S&A and C&A groups, the solid content in overflow wastewater (SCOW) fluctuated over time but could be mostly controlled in 300 ppm. The pH declined from 7 to 4 with time in the S&A group, and it was 7-8 in the C&A group. (iv) Thus, a backfill system with dewatering technology based on the C&A combination was designed. In the field application, the overflow water was recycled with the SCOW of less than 250 ppm and the pH of 7.5, while the underflow concentration was greater than 70 wt.%. The achievement provides a way to utilize the tailings containing sodium silicate effectively and environmentally, which will reduce the tailings dam on the Earth.

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“…In the study to enhance the pozzolanic activity of granulated copper slag by adding calcium oxide (CaO), Feng et al [24] reported that with 20% of CaO, the strength activity index for the mortar increased, which confirmed improvement in the modified slag. A geopolymer using lithium slag and sodium hydroxide (NaOH) as an activator was synthesized by He et al [25].…”

Section: Introductionmentioning

confidence: 99%

Alkaline Activation of Basic Oxygen Furnace Slag Modified Gold Mine Tailings for Building Material

Mashifana

Sebothoma

Sithole

2021

Advances in Civil Engineering

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The mining industry generates large quantities of waste as tailings. The tailings have an adverse environmental impact. This study explored the utilization and stabilization of Barberton gold mine tailings (GMTs) and basic oxygen furnace slag (BOFS) to synthesize geopolymers for other applications. The geochemical, chemical, and geotechnical properties of GMT, BOFS, GMT geopolymer, and GMT: BOFS geopolymer were also studied. Sodium hydroxide (NaOH) and potassium hydroxide (KOH) were used as alkaline activators. The highest unconfined compressive strength (UCS) recorded for GMT geopolymers cured for 5 days at the elevated temperature of 90°C was 4.31 MPa and 6.59 MPa for NaOH and KOH, respectively. GMT: BOFS geopolymer attained the UCS of 20.0 MPa and 25.7 MPa, with NaOH and KOH, respectively, at the same curing conditions. Characterization of the binders showed that BOFS was a good source of calcium, which had a positive effect on the geopolymer gels by balancing the ionic charges. The developed GMT: BOFS geopolymers satisfied the minimum requirements for nonfacing building masonry as stipulated by the ASTM C34-17a, ASTM C129-14c 0076a, and the SANS 227: 2007 for burnt clay masonry units and can be used as a mine backfill paste and for lightweight civil applications. The geopolymers passed the toxicity characteristic leaching procedure (TCLP), and the results yielded low heavy metals concentration, indicating that the geopolymers will not leach to the environment.

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Modification of glass structure via CaO addition in granulated copper slag to enhance its pozzolanic activity

Cited by 56 publications

References 48 publications

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

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

Design and Application of Rapid Dewatering for Tailings Containing Sodium Silicate: Laboratory and Industrial Test Results

Alkaline Activation of Basic Oxygen Furnace Slag Modified Gold Mine Tailings for Building Material

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