extra info, Pak. 


Plants absorb some uranium from soil. Dry weight concentrations of uranium in 
plants range from 5 to 60 parts per billion, and ash from burnt wood can have 
concentrations up to 4 parts per million.[18] Dry weight concentrations of 
uranium in food plants are typically lower with one to two micrograms per day 
ingested through the food people eat.[18]
http://en.wikipedia.org/wiki/Uranium
http://www.curie.fr/fondation/musee/marie-pierre-curie.cfm/lang/_gb.htm
http://www.project2061.org/publications/sfaa/online/chap10.htm 
 
Pierre (1859-1906) and Marie (1867-1934) Curie
Contributions: Pierre and Marie were award the Noble Prize in Physics in 1903 
for their work on radioactivity. Marie Curie became the first woman to be 
awarded the nobel prize and the first person to obtain two nobel prizes when 
she 
won the prize for the discovery of Polonium and Radium in 1911. 
Though it was Henri Becquerel that discovered radioactivity, it was Marie Curie 
who coined the term. Using a device invented by her husband and his brother, 
that measured extremely low electrical currents, Curie was able to note that 
uranium electrified the air around it. Further investigation showed that the 
activity of uranium compounds depended upon the amount of uranium present and 
that radioactivity was not a result of the interactions between molecules, but 
rather came from the atom itself. Using Pitchblende and chalcolite Curie found 
that Thorium was radioactive as well. She later discovered two new radioactive 
elements: Radium and Polonium which took her several years since these elements 
are difficult to extract and extremely rare. Unfortunately, the Curies died 
young. Pierre Curie was killed in a street accident and Marie died of aplastic 
anemia, almost certainly a result of radiation exposure. 
 

salam, 
iin fr



________________________________
From: Rovicky Dwi Putrohari <rovi...@gmail.com>
To: geologi...@googlegroups.com; IAGI <iagi-net@iagi.or.id>; 
katg...@googlegroups.com
Sent: Thu, July 22, 2010 2:21:58 PM
Subject: [iagi-net-l] Menghasilkan bahan bakar nuklir dari limbah batubara

Mungkin banyak yang masih menganggap bahwa batubara itu merupakan produk
sisa tumbuhan sehingga lebih alami mendekati mahluk hayati. Dari sisi
radiasi banyak spekulasi menganggap batubara itu bebas radiasi. Tapi artikel
yang cukup lama (2007) dibawah ini mungkin akan menjadikan kita berpikir
ulang tentang radiasi batubara.

http://www.world-nuclear-news.org/newsarticle.aspx?id=14224

Sparton produces first yellowcake from Chinese coal ash
16 October 2007

Sparton Resources announced that it had successfully produced a small
quantity of yellowcake (U3O8) from fly ash from a Chinese coal-fired power
plant.

The uranium extraction test work is being conducted by Sparton's processing
engineering consulting firm Lyntek Inc of Denver, Colorado, USA. The test to
produce yellowcake used 6.1 kg of mixed fly ash produced at the Xiaolongtang
power plant. The ash averaged some 0.4 pounds of U308 per tonne of ash (160
parts per million uranium).

Leaching was done with sulphuric acid and the yellowcake was produced by
passing the filtered leach solution through a standard ion exchange resin,
stripping the resin and precipitating the uranium compound. This process is
essentially similar to the uranium extraction and yellowcake production
methods used by primary uranium ore processing plants or in-situ leach (ISL)
operations using an acidic leaching solution.



New test work currently in progress will focus on refining the leaching,
filtering and ion exchange processes. The leach solutions contain
significant amounts of gypsum and iron oxide which require removal by
filtering prior to passing them through the ion exchange system. The next
tests will evaluate uranium extraction from ash from the large waste pile at
Xiaolongtang. A 20 kg representative sample taken from drill holes used to
test the waste pile will be used for this work.

Xiaolongtang coal-ash stockpil


Meanwhile, Sparton said that a drilling program on the fly ash waste pile at
Xiaolongtang was completed in September and the results indicated that pile
is on average some 17 metres thick and contains around 5.3 million tonnes of
ash. In July, Sparton suggested that the stockpile could contain up to 10
million tonnes of coal ash. Staff at the power plant had previously
estimated there were some 5 million tonnes of ash. Initial tests by Lyntek
indicated that the material contains some 0.46 pounds of U308 per tonne of
ash (160-180 parts per million uranium), suggesting a total of some 2085
tonnes U3O8 (1770 tU) are contained in the Xiaolongtang ash piles.

In early January 2007, Canada's Sparton announced the signing of an
agreement with the Xiaolongtang Guodian Power Company for a three-phase
program to test and possibly commercialize the extraction of uranium from
waste coal ash at the company's thermal power stations in Yunnan province.
Sparton, together with its partner ARCN - the remote sensing and research
branch of state-owned China National Nuclear Corp (CNNC) - has identified
Xiaolongtang and nearby power plants as a possible major supply of
uraniferous coal ash.

The Xiaolongtang, Dalongtang and the Kaiyuan stations, all located within 20
km of each other, burn coal from a centrally located open pit lignite coal
mine that contains anomalously high uranium content. The plants are located
approximately 250 km southeast of the Yunnan provincial capital of Kunming.

Since signing the agreement with China, Sparton has also signed agreements
to do similar programs in six countries in Central Europe and with South
Africa.

Further information

Sparton Resources <http://www.spartonres.ca/>

WNA's Naturally-Occurring Radioactive Materials
(NORM)<http://www.world-nuclear.org/info/inf30.html>
information paper

WNN: Sparton: More coal ash, more
uranium<http://www.world-nuclear-news.org/industry/Sparton_More_uranium_in_Chinese_coal_ash-020807.shtml>

WNN: WildHorse and Sparton study coal
ash<http://www.world-nuclear-news.org/explorationNuclearFuel/250507-WildHorse_and_Sparton_study_European_coal_ash.shtml>

WNN: CNNC looks for new sources of
uranium<http://www.world-nuclear-news.org/explorationNuclearFuel/180507-CNNC_looks_for_new_sources_of_uranium.shtml>

WNN: Project to extract uranium from coal
ash<http://www.world-nuclear-news.org/industry/020207-Project_to_extract_uranium_from_coal_ash.shtml>


      

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