Immobilization potential and immobilization mechanism of arsenic in cemented paste backfill

Li, Yuancheng; Min, Xin; Ke, Yanxiong; Fei, Jiangchi; Liu, Degang; Tang, Chong–Jian

doi:10.1016/j.mineng.2019.04.041

Cited by 50 publications

(27 citation statements)

References 37 publications

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“…On the other hand, the sulfate content tends to increase continuously, especially from the 7th day. Both findings are compatible with Li et al (Li et al, 2019).…”

Section: Analysis Of Time-dependent Sulfate and Sulfur Concentratessupporting

confidence: 93%

“…In addition, the sulfurous contents were high in both dry materials and tailings water according to the ICP-MS test. Earlier studies have shown that a chemical reaction occurs in the presence of sulfate and acid production and that as a consequence, the mechanical strength of the backfill material decreases (Hamberg et al, 2017;Cao et al, 2019;Li et al, 2019). Consequently, it can be expected that the sulfate ions affect the cement applications negatively.…”

Section: Resultsmentioning

confidence: 99%

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Characterization of Strength and Quality of Cemented Mine Backfill Made up of Lead-Zinc Processing Tailings

2021

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Predicting the reactions of the backfill materials exposed to the effects of air and groundwater will eventually ensure an efficient and accurate mine fill system for sustainable mining operations. This paper reveals the effect of the mobility of sulfur ions within lead-zinc processing tailings on strength and quality of cemented mine backfills. Some laboratory tests such as X-ray diffraction, ion chromatography, scanning electron microscopy, combustion tests, chemical analysis, pH and zeta potential measurements were performed to better characterize the backfill’s mechanical and microstructural properties. Moreover, CEM II/A-P Portland pozzolan and CEM IV/A pozzolanic cements as ready-to-use cement products were used for cemented mine backfill preparation. To ensure the carrier of the lead-zinc tailings and to prevent the mobility of the sulfurous components, a binder content ranging from 3 to 7 wt% were employed in mine backfills. The experimental findings demonstrate that the used cement type and proportions were insufficient and some fractures are occurred in the samples due to the sulfur ion mobility. Accordingly, one can state clearly that the elemental analysis through the combustion test method can provide fast and reliable results in the determination of sulfur within lead-zinc processing tailings.

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“…On the other hand, the sulfate content tends to increase continuously, especially from the 7th day. Both findings are compatible with Li et al (Li et al, 2019).…”

Section: Analysis Of Time-dependent Sulfate and Sulfur Concentratessupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Characterization of Strength and Quality of Cemented Mine Backfill Made up of Lead-Zinc Processing Tailings

2021

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“…This observation reflects that As V appears to be incorporated into the crystalline minerals (e.g., calcium silicate and CSH) during the phase transition processes as a result of prolonging the curing time. 3,19 SEM images of geopolymer specimens with 54 wt.% FA are shown in Figures 5, 6, and S8. Obviously, three distinct particulates, i.e., the partially and unreacted FA particles, the unreacted MT, and the resultant geopolymer gels, can be identified.…”

Section: Effect Of Curing Time On Ucs It Has Been Reportedmentioning

confidence: 99%

Arsenic(V) Immobilization in Fly Ash and Lead-Zinc Mine Tailing-based Geopolymer: Performance and Mechanism Insight

Bah

Jin

Ramos

et al. 2022

Preprint

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Global mining activities produce thousands of millions of toxic-bearing mine tailing (MT) wastes each year. Storage of the mine tailings not only encroaches upon large areas of cropland but also arouses additional ecological and environmental risks especially when the toxics (e.g., arsenic) are leached out during the stormy weather. Herein we demonstrate that geopolymerization of a mixture of the toxic-bearing mine tailings and the coal fly ash (FA) with a blending of sodium hydroxide (NaOH) and sodium silicate solution can effectively immobilize extra arsenic (As) species derived from arsenic-bearing wastes in the geopolymer specimens, which also possess high compressive strengths (e.g., > 25 MPa for specimens with 54 wt.% FA and activated with 10 M NaOH), allowing them to be further used as low-carbon, cement-free building materials. The geopolymer strength was found to depend clearly upon the NaOH concentration, the fly ash content, the arsenic content, and the curing time, with the maximum being 37.07 MPa for a specimen with 54 wt.% FA, 0.03 wt.% As activated with 10 M NaOH and cured for 28 days. Leaching tests showed that all specimens can achieve an immobilization efficiency as high as 95.4% toward As, and that the leachabilities of both As and other toxic heavy metals are far below the limits of the Chinese leaching standard for hazardous wastes (GB 5085.3 − 2007). Microstructural analyses using X-ray diffractometer (XRD), scanning electron microscopic (SEM), Fourier transform infrared (FTIR) indicate that the As species was physically encapsulated along with the formation of geopolymer gels at first, and then chemically incorporated into the crystalline phases (e.g., calcium silicate, and calcium silicate hydroxide) derived from the geopolymer gels as a result of prolonging the curing time. The developed FA/MT-based geopolymers represent a promising green material for both the remediation of As-bearing lands and the construction industry.

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“…Recently, the impacts of nitrate on the bacterial catalyzed reductive dissolution of arsenic in contaminated aquifer soils have been investigated by many researchers (Chen et al 2016;Zhang et al 2017;Shakya et al 2018;Li et al 2019;Shakya & Ghosh 2019;Vishvas et al 2020). The common findings from those studies indicated that due to inhibition of the bacterial arsenate respiring activity, nitrate/nitrite dramatically inhibits the microbe-catalyzed reductive dissolution of arsenic and iron in the arsenic-contaminated soils.…”

Section: Arsenic Vs Nitrogenmentioning

confidence: 99%

Influence of chemical fertilizers on arsenic mobilization in the alluvial Bengal delta plain: a critical review

Islam

Mostafa

2021

Journal of Water Supply: Research and Technology-Aqua

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Arsenic contamination of alluvial aquifers of the Bengal delta plain causes a serious threat to human health for over 75 million people. The study aimed to explore the impacts of chemical fertilizer on arsenic mobilization in the sedimentary deposition of the alluvial Bengal delta plain. It selected ten comparatively higher affected Districts and the least affected two Divisions as a referral study site. The countrywide pooled concentration of arsenic in groundwater was 109.75 μg/L (52.59, 166.91) at a 95% confidence interval, which was double the national guideline value (50 μg/L). The analysis results showed a strong positive correlation (r ≥ 0.5) of arsenic with NO3, NH4, PO4, SO4, Ca, and K, where a portion of those species originated from fertilizer leaching into groundwater. The results showed that PO4 played a significant influence in arsenic mobilization, but the role of NO3, SO4, and NH4 was not clear at certain lithological conditions. It also showed that clay, peat, silt-clay, and rich microbial community with sufficiently organic carbon loaded soils could lead to an increase in arsenic mobilization. Finally, the study observed that the overall lithological conditions are the main reason for the high arsenic load in the study area.

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Immobilization potential and immobilization mechanism of arsenic in cemented paste backfill

Cited by 50 publications

References 37 publications

Characterization of Strength and Quality of Cemented Mine Backfill Made up of Lead-Zinc Processing Tailings

Characterization of Strength and Quality of Cemented Mine Backfill Made up of Lead-Zinc Processing Tailings

Arsenic(V) Immobilization in Fly Ash and Lead-Zinc Mine Tailing-based Geopolymer: Performance and Mechanism Insight

Influence of chemical fertilizers on arsenic mobilization in the alluvial Bengal delta plain: a critical review

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