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Current Status and Atmospheric Mercury Emissions Associated with Large-Scale Gold Smelting Industry in China

Category: Air Pollution and Health Effects

Volume: 17 | Issue: 1 | Pages: 238-244
DOI: 10.4209/aaqr.2016.01.0033
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Jiajia Gao1, Tao Yue 1,2, Penglai Zuo 1, Yu Liu3, Li Tong1, Chenlong Wang1, Xiaoxi Zhang1, Shufang Qi1

  • 1 Department of Air Pollution Control, Beijing Municipal Institute of Labour Protection, Beijing 100054, China
  • 2 State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310058, China
  • 3 Chinese Research Academy of Environment Science, Beijing 100012, China

Highlights

Current situation of gold smelting industry and its APCDs in China were reviewed.
Hg concentration and speciation were analyzed in four large-scale gold smelters.
Hg concentrations in four tested gold smelters were lower than GB 9078-1996 standard.
The proportion of Hgp in the exhaust flue gas was highest for total mercury content.
Emission factor of Hg obtained in our study was lower than that in previous research.


Abstract

Mercury, being bound with metal concentrate, is released to atmosphere in the smelting process, and has adverse effects on surrounding ambient air quality and public health. In this study, based on literature and field investigations, onsite measurements of mercury emissions to the atmosphere for four large-scale gold smelters were estimated. Almost all of the atmospheric mercury released from the roasting pretreatment process occurred before acid plants. All the concentrations of mercury emitted from the four tested gold smelters were much lower than the emission standard of air pollutants for GB 9078–1996 Grade II level areas of 1000 µg m–3. The speciation of Hgp took up the largest proportions for the total mercury concentrations. Because of using high mercury oxidation efficiency of double-conversion double absorption (DCDA) technology, the proportions of Hg2+ in the exhaust flue gas was higher than Hg0. Average emission factors of atmospheric mercury for these four tested gold smelters were calculated to be 1.7 kg of Hg per ton gold produced, and the national total amount of mercury emitted from large-scale gold smelting industry in the year of 2014 was estimated to 639.9 kg. However, mercury emission factors obtained from present study were much lower than that in previous research. Thus, with the exact emission factor obtaining from more specific field-test data and the detailed activity data information about gold smelting industry, an accurate inventory of mercury emissions to the atmosphere from large-scale gold smelters in China can be updated in the future.

Keywords

Mercury (Hg) emissions Hg speciation Ontario Hydro Method (OH Method) EPA Method 30B Large-scale gold smelter


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