Leaching characteristics and release rule of heavy metals from gold tailings

被引：0
|
作者：
Qian L. [1 ,2 ]
Li B. [1 ,3 ]
Chen X. [1 ,3 ]
Li X. [4 ]
Lin H. [1 ,3 ]
机构：
[1] School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing
[2] Sino-Japan Friendship Center for Environmental Protection, Beijing
[3] Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing
[4] School of Energy and Environment, Southeast University, Nanjing
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2020年 / 50卷 / 06期
关键词：
Heavy metals; Leaching characteristics; Release kinetics model; Simulated rainfall; Tailings of gold mine;
D O I：
10.3969/j.issn.1001-0505.2020.06.013
中图分类号：
学科分类号：
摘要：
To explore the rule of heavy metal release in gold tailings and its impacts on the environment, the leaching and release characteristics of heavy metals in tailings from a gold mine were studied by a dynamic leaching experiment. The artificial simulated acid rain solution with initial pH values of 3.0, 4.5 and 6.0 was prepared, and the kinetics experiment of heavy metal leaching from gold tailings was carried out with a column leaching device. Experimental results show that the heavy metal Mn in tailings is slightly polluted, Zn and Cu are moderately or severely polluted, Pb is severely polluted, and As is severely or extremely polluted. With the increase of leaching time, the pH values of the tailing leaching solutions in different initial pH value groups gradually increase, and then stabilize between 7.9 and 8.2, indicating that the tailings have a higher alkaline mineral content and a certain acid buffering capacity, while the conductivity values of the leaching solutions all show a sharp decrease first and then tend to be stable. The release rates of Zn and Mn from tailings are both higher than those of As, Cu and Pb, while the sensitivities of Pb and Zn to the acid leaching solution are relatively higher among the studied heavy metals. The first-order kinetics equation and the double-constant rate equation can better describe the leaching kinetics of As, Pb, Cu, Mn, and Zn from tailings, and the parabolic equation can also describe the leaching kinetics of Cu and Mn well. The leaching and release of heavy metals in tailings is a complex process controlled by multi-factors. © 2020, Editorial Department of Journal of Southeast University. All right reserved.
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页码：1084 / 1089
页数：5
相关论文
共 19 条
  • [1] Annualreport on comprehensive utilization of resources in China(2014), Recyclable Resources and Circular Economy, 7, 10, pp. 3-8, (2014)
  • [2] Boonsrang A, Chotpantarat S, Sutthirat C., Factors controlling the release of metals and a metalloid from the tailings of a gold mine in Thailand, Geochemistry: Exploration, Environment, Analysis, 18, 2, pp. 109-119, (2018)
  • [3] Fu S, Lu J M., Temperature-driven variation in the removal of heavy metals from contaminated tailings leaching in northern Norway, Environmental Monitoring and Assessment, 191, 2, (2019)
  • [4] Lee P K, Kang M J, Jo H Y, Et al., Sequential extraction and leaching characteristics of heavy metals in abandoned tungsten mine tailings sediments, Environmental Earth Sciences, 66, 7, pp. 1909-1923, (2012)
  • [5] Cao Y M, Tian J T, Li C H, Et al., Leaching experimental study on gold tailings, Modern Mining, 33, 5, pp. 159-160, (2017)
  • [6] Zhu J B, Chen F R, Lu L, Et al., Heavy metal geochemistry behavior during the oxidation of the Fankou Pb-Zn mine tailings in Guangdong Province and the implications for environmental remediation of the mines, Acta Scientiae Circumstantiae, 25, 3, pp. 414-422, (2005)
  • [7] Li X Y, Wu C., Fraction distribution and effect of leachate pH on the migration of heavy metals in soil around a lead-zinc mine in Hunan province, Environmental Engineering, 35, 5, pp. 172-176, (2017)
  • [8] Puyang X H, Deng R Y, Wang C C, Et al., Leaching characteristics of heavy metals from tailings under simulated rainfall in Dexing copper mine, Environmental Engineering, 37, 5, pp. 61-65, (2019)
  • [9] Fan L Q, Zhou X, Luo H B, Et al., Release of heavy metals from the pyrite tailings of Huangjiagou pyrite mine: Batch experiments, Sustainability, 8, 1, (2016)
  • [10] Hansen H K, Yianatos J B, Ottosen L M., Speciation and leachability of copper in mine tailings from porphyry copper mining: Influence of particle size, Chemosphere, 60, 10, pp. 1497-1503, (2005)
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