Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

How much of thallium pollutants will be released to environment by utilizing minerals?

01.10.2013
A recent research has explored the environmental exposure and flux of thallium to the environment; and it provides the foundations for theoretical calculation to control Tl pollution by utilizing of Tl-rich pyrite minerals.

This paper, "Environmental Exposure and Flux of Thallium by Industrial Activities Utilizing Thallium-Bearing Pyrite", written by professor CHEN Yong-Heng et al. from Key Laboratory of Waters Safety & Protection in the Pearl River Delta, Ministry of Education, Guangzhou University, is published in Science China: Earth Sciences (No.9, 2013) .

Thallium is a rare but widely dispersed element with high toxicity .Severe thallium intoxication could lead to neurological disease and death. Thallium has low background levels in environment, with concentrations of about 0.01~0.05 ìg/L in freshwater and marine respectively. It usually presents in some specific sulfide and silicate minerals. Due to the mining activities of Tl-rich sulfide minerals, Tl pollution is increasingly severe in China; and the Tl level in some industrial waste water even exceeded 10 mg/L.

This paper firstly combined the sequential extraction and ICP-MS to investigate the geo-chemical speciation and partitioning transformation of thallium during the production process, analyzed the environmental exposure, assessed accurately of its environmental flux.

Result showed that 40% of Tl in the pyrite minerals was active, among which 25% of Tl was washed into water during gas cleaning process, and 15% of the active Tl retained in the slags that could be possibly transferred to the soil or water with the slag deposal or being reused during roasting of ores. Meanwhile, the other portion (60% of Tl) remained relatively stable in the residual phase. Given the above information, with an industrial site bearing ore (20 mg Tl/kg) production of three million tons annually, 24 tons of Tl would enter into the environment, including 15 tons into the aquatic system, which brings serious Tl pollution into the environment. Therefore, it is urgent to control Tl pollution from the headstream.

This study was supported by United Sponsorship of the National Natural Science Foundation of China and Guangzhou Provincial Government (Grant No.U0633001), the National Science Foundation of China (Grant No.20477007).

Corresponding author:

CHEN Yongheng
chenyheng@eyou.com
See the article:
CHEN Y H, Wang C L, LIU J, Wang J, QI J Y, Wu Y J, Environmental exposure and flux of thallium by industrial activities utilizing thallium-bearing pyrite, SCIENCE CHINA Earth Sciences, 2013, 56(9): 1502-1509.

http://earth.scichina.com:8080/sciDe/EN/abstract/abstract510944.shtml

Science China Press Co., Ltd. (SCP) is a scientific journal publishing company of the Chinese Academy of Sciences (CAS). For 50 years, SCP takes its mission to present to the world the best achievements by Chinese scientists on various fields of natural sciences researches.

YAN Bei | EurekAlert!
Further information:
http://www.scichina.org

More articles from Earth Sciences:

nachricht Wintertime Arctic sea ice growth slows long-term decline: NASA
07.12.2018 | NASA/Goddard Space Flight Center

nachricht Why Tehran Is Sinking Dangerously
06.12.2018 | Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Researchers develop method to transfer entire 2D circuits to any smooth surface

What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.

Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...

Im Focus: Three components on one chip

Scientists at the University of Stuttgart and the Karlsruhe Institute of Technology (KIT) succeed in important further development on the way to quantum Computers.

Quantum computers one day should be able to solve certain computing problems much faster than a classical computer. One of the most promising approaches is...

Im Focus: Substitute for rare earth metal oxides

New Project SNAPSTER: Novel luminescent materials by encapsulating phosphorescent metal clusters with organic liquid crystals

Nowadays energy conversion in lighting and optoelectronic devices requires the use of rare earth oxides.

Im Focus: A bit of a stretch... material that thickens as it's pulled

Scientists have discovered the first synthetic material that becomes thicker - at the molecular level - as it is stretched.

Researchers led by Dr Devesh Mistry from the University of Leeds discovered a new non-porous material that has unique and inherent "auxetic" stretching...

Im Focus: The force of the vacuum

Scientists from the Theory Department of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science (CFEL) in Hamburg have shown through theoretical calculations and computer simulations that the force between electrons and lattice distortions in an atomically thin two-dimensional superconductor can be controlled with virtual photons. This could aid the development of new superconductors for energy-saving devices and many other technical applications.

The vacuum is not empty. It may sound like magic to laypeople but it has occupied physicists since the birth of quantum mechanics.

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

New Plastics Economy Investor Forum - Meeting Point for Innovations

10.12.2018 | Event News

EGU 2019 meeting: Media registration now open

06.12.2018 | Event News

Expert Panel on the Future of HPC in Engineering

03.12.2018 | Event News

 
Latest News

Small but ver­sat­ile; key play­ers in the mar­ine ni­tro­gen cycle can util­ize cy­anate and urea

10.12.2018 | Life Sciences

New method gives microscope a boost in resolution

10.12.2018 | Physics and Astronomy

Carnegie Mellon researchers probe hydrogen bonds using new technique

10.12.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>