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Sustainability 2016, 8(1), 96;

Release of Heavy Metals from the Pyrite Tailings of Huangjiagou Pyrite Mine: Batch Experiments

1,* , 1
College of Civil Engineering, Sichuan Agricultural University, Dujiangyan 611830, China
College of Environment, Sichuan Agricultural University, Chengdu 611130, China
Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences, Chengdu 610041, China
Research Center of Multipurpose Utilization of Metal Mineral Resources, China Geological Survey, Chengdu 611130, China
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Marc A. Rosen
Received: 23 November 2015 / Revised: 15 January 2016 / Accepted: 18 January 2016 / Published: 20 January 2016
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To provide the basic information about the release of heavy metals from the pyrite tailings of Huangjiagou pyrite mine, the pyrite tailings were investigated through a series of batch experiments under different initial pH of extractant, temperature, liquid-solid (LS) ratio, and soaking time conditions. Moreover, calcium carbonate was added in the pyrite tailings to determine the reduction effect on the release of heavy metals. The results show that Fe, Cr, Cu, Mn, Zn, and Ni were the major heavy metals in the pyrite tailings. Low initial pH and high LS ratio significantly promoted Fe, Cu, Mn, Ni, and Zn release, and high temperature significantly promoted Fe, Cu, Mn, and Ni release. Only small amounts of Cr were detected at low LS ratios. With the increase of soaking time, the released amount of Fe, Cu, Mn, Ni, and Zn increased to the maximum value within 48 h, respectively. After adding calcium carbonate, the released amounts of Fe, Cu, and Zn reduced at least 70.80% within 48 h soaking time. The results indicate that summer and the early soaking stage are the main phases for the release of heavy metals from the pyrite tailings. In the pyrite tailings, Cr is difficult to release. Adding calcium carbonate can effectively reduce the release of Fe, Cu, and Zn. View Full-Text
Keywords: heavy metal; release; pyrite tailings heavy metal; release; pyrite tailings

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Fan, L.; Zhou, X.; Luo, H.; Deng, J.; Dai, L.; Ju, Z.; Zhu, Z.; Zou, L.; Ji, L.; Li, B.; Cheng, L. Release of Heavy Metals from the Pyrite Tailings of Huangjiagou Pyrite Mine: Batch Experiments. Sustainability 2016, 8, 96.

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