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 A promising target in the quest for a 1-million-year-old Antarctic ice core
24.05.2018 | University of Washington

nachricht Tropical Peat Swamps: Restoration of Endangered Carbon Reservoirs
24.05.2018 | Leibniz-Zentrum für Marine Tropenforschung (ZMT)

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Powerful IT security for the car of the future – research alliance develops new approaches

The more electronics steer, accelerate and brake cars, the more important it is to protect them against cyber-attacks. That is why 15 partners from industry and academia will work together over the next three years on new approaches to IT security in self-driving cars. The joint project goes by the name Security For Connected, Autonomous Cars (SecForCARs) and has funding of €7.2 million from the German Federal Ministry of Education and Research. Infineon is leading the project.

Vehicles already offer diverse communication interfaces and more and more automated functions, such as distance and lane-keeping assist systems. At the same...

Im Focus: Molecular switch will facilitate the development of pioneering electro-optical devices

A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.

The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...

Im Focus: LZH showcases laser material processing of tomorrow at the LASYS 2018

At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.

At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...

Im Focus: Self-illuminating pixels for a new display generation

There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?

At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

In focus: Climate adapted plants

25.05.2018 | Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

 
Latest News

In focus: Climate adapted plants

25.05.2018 | Event News

Flow probes from the 3D printer

25.05.2018 | Machine Engineering

Less is more? Gene switch for healthy aging found

25.05.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>