Immobilization of mercury and arsenic in a mine tailing from a typical Carlin-type gold mining site in southwestern part of China

Wang, Jianxu; Sun, Xuecheng; Xing, Ying; Xia, Jicheng; Feng, Xinbin

doi:10.1016/j.jclepro.2019.118171

Cited by 22 publications

(6 citation statements)

References 55 publications

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“…Mercury-contaminated paddy fields in many developing countries (e.g., China, Indonesia, Brazil, Philippines, Cambodia, India, Thailand, and Tanzania) have attracted global concern because of recorded health issues in populations which consume contaminated rice grain. A key constraint on progressing mercury remediation, and mitigating exposure pathways and risk is the lack of reliable, affordable technology. , In the current work we have found for the first time that amendment of soil with nanoactivated carbon (NAC) can reduce the Hg concentration in soil pore water and its uptake by Oryza sativa L.…”

Section: Resultsmentioning

confidence: 97%

“…A key constraint on progressing mercury remediation, and mitigating exposure pathways and risk is the lack of reliable, affordable technology. 59,60 In the current work we have found for the first time that amendment of soil with nanoactivated carbon (NAC) can reduce the Hg concentration in soil pore water and its uptake by Oryza sativa L.…”

Section: ■ Materials and Methodsmentioning

confidence: 95%

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Nanoactivated Carbon Reduces Mercury Mobility and Uptake by Oryza sativa L: Mechanistic Investigation Using Spectroscopic and Microscopic Techniques

Wang

Shaheen

Anderson

et al. 2020

Environ. Sci. Technol.

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Mercury (Hg) contamination of paddy field poses a health risk to rice consumers, and its remediation is a subject of global scientific attention. In recent years focus has been given to in situ techniques which reduce the risk of Hg entering the food chain. Here, we investigate the use of nanoactivated carbon (NAC) as a soil amendment to minimize Hg uptake by rice plants. Application of 1–3% NAC to soil (by weight) reduced Hg concentration in the pore water (by 61–76%) and its bioaccumulation in the tissues of rice plants (by 15–63%), relative to the corresponding control. Specifically, NAC reduced the Hg concentration of polished rice by 47–63% compared to the control, to a level that was 29–49% lower than the food safety value (20 ng g–1) defined by the Chinese government. The NAC induced a change in Hg binding from organic matter to nano-HgS in the soil as a function of soil amendment. This Hg speciation transformation might be coupled to the reduction of sulfoxide to reduced sulfur species (S0) by NAC. The NAC amendment may be a practical and effective solution to mitigate the risk of Hg transferring from contaminated soil to rice grains at locations around the world.

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Section: Resultsmentioning

confidence: 97%

Section: ■ Materials and Methodsmentioning

confidence: 95%

Nanoactivated Carbon Reduces Mercury Mobility and Uptake by Oryza sativa L: Mechanistic Investigation Using Spectroscopic and Microscopic Techniques

Wang

Shaheen

Anderson

et al. 2020

Environ. Sci. Technol.

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“…In order to solve the environmental problems caused by tailings accumulation, people have been seeking solutions and conducting research on the comprehensive utilization of tailings. For example, residual gold and associated metal elements such as Ag, Cu, Pb, Zn, and W can be recovered from tailings [1][2][3][4] , and non-metallic minerals such as quartz, feldspar, and sericite can be extracted from tailings [5][6] . In recent years, the gold grade of mines has gradually decreased and the value of tailings has become lower.…”

Section: Introductionmentioning

confidence: 99%

Reuse gold tailings as filling materials for depleted mines

Hu,

Guo,

et al. 2023

Preprint

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The accumulation of gold mine tailings poses a significant environmental challenge. The feasibility of reuse this waste as underground filling materials was investigated in this work. The filling materials were prepared by mixing the tailings, Portland cement and water using a one-step method. The fluidity, bleeding rate, setting time, mechanical behavior, water quality analysis and toxicity characteristic of leaching solution of the filling materials with various tailings/cement ratios and slurry concentrations were characterized and assessed. The results show secondary hydration reaction occurred between the tailings and the cement. The rheological properties, setting/hardening properties and bleeding rate became less favorable with the increase of the tailings/cement ratio and slurry concentration. The water quality index of the leaching solution was lower than the permissible limit values. The uniaxial compressive strength of the filling materials prepared with a tailings/cement ratio of 4:1 and a slurry concentration of 68% was 0.99 MPa, which met the filling purposes. The values of heavy metal leaching (copper, zinc, cadmium, lead, total chromium, hexavalent chromium, beryllium, barium, argentum, selenium, nickel, hydrargyrum, arsenic, cyanide and fluorion) were much lower than the standard limits. This indicates that gold mine tailings could be utilized as the filling materials to reduce waste accumulation without causing any hazards to environment or human beings.

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“…Oxidation of As-S minerals such as FeAsS will result in an increase in the leaching of As from the tailings, which poses a serious hazard to the surrounding environment [ 13 ]. Studies have shown that the reaction of iron and calcium salts with arsenate ions produces the corresponding precipitates, which can effectively reduce the leaching of As from tailings [ 14 , 15 , 16 ]. However, there are some differences in the composition and types of As-containing minerals in different types of tailings or the same type of tailings from different regions [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Harmless Treatment of High Arsenic Tin Tailings and Environmental Durability Assessment

Zhao

Zhang

Yang

et al. 2022

IJERPH

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The treatment of arsenic (As) in tin tailings (TT) has been an urgent environmental problem, and stabilization/solidification (S/S) treatment is considered an effective technology to eliminate contamination of As. In this study, we developed a low-carbon and low-alkalinity material to S/S of As, and the results showed that the leaching concentration of As after treatment was lower than the Chinese soil environmental quality standard (0.1 mg/L). Based on a series of characterization tests, we found that OH− promoted the dissolution of As(III)-S, Fe-As(V), and amorphous As(III)-O species and formed Ca-As(III) and Ca-(V) species with Ca2+. Simultaneously, hydration produces calcium silicate hydrate (C-S-H) gel and ettringite by the form of adsorption and ion exchange to achieve S/S of As. We also assessed the durability of this material to acidity and temperature, and showed that the leaching concentration of As was below 0.1 mg/L at pH = 1–5 and temperature 20–60 °C. The method proposed in this study, S/S of As, has excellent effect and environmental durability, providing a new solution for harmless treatment of TT and its practical application.

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Immobilization of mercury and arsenic in a mine tailing from a typical Carlin-type gold mining site in southwestern part of China

Cited by 22 publications

References 55 publications

Nanoactivated Carbon Reduces Mercury Mobility and Uptake by Oryza sativa L: Mechanistic Investigation Using Spectroscopic and Microscopic Techniques

Nanoactivated Carbon Reduces Mercury Mobility and Uptake by Oryza sativa L: Mechanistic Investigation Using Spectroscopic and Microscopic Techniques

Reuse gold tailings as filling materials for depleted mines

Harmless Treatment of High Arsenic Tin Tailings and Environmental Durability Assessment

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