logo
* 搜尋
* 核能資訊中心
* 中心簡介
* 日本福島核災專區
* 相關資訊
國際核能現況 : First yellowcake from seawater for US team
發表人 nicenter 於 2018/6/15 15:13:41 (72 人讀取)

Researchers have successfully used acrylic fibres to extract uranium from seawater in a trial conducted at Pacific Northwest National Laboratory (PNNL). The team say the technology, which uses inexpensive material, could be competitive with the costs of land-based uranium mining.





Yellowcake produced from uranium captured from seawater using LCW's modified yarn (Image: LCW)

The material was developed by Idaho-based clean energy company LCW Supercritical Technologies with early support from PNNL through the US Department of Energy's Office of Nuclear Energy. Uranium in seawater is adsorbed onto a molecule that is chemically bound to the surface of the polymer fibre. The adsorbent properties are reversible, meaning that the uranium can be easily released and processed into yellowcake, and the polymer is durable and reusable.


Three separate month-long tests were carried out using seawater from Sequim Bay, next to PNNL's Marine Sciences Laboratory. Seawater was pumped through about a kilogram of fibre in conditions mimicking the open ocean. The uranium was then extracted, producing in total about five grams of uranium.


PNNL researcher Gary Gill described the achievement as a significant milestone, showing that the approach could eventually provide a commercially attractive option. "It might not sound like much, but it can really add up," he said.


Chien Wai, president of LCW, said the adsorbent material was inexpensive and could even be produced using waste yarn. The fibres also have the potential to be used in environmental clean-up and to extract other metals from seawater, such as vanadium.


LCW is now applying for further funding for a uranium extraction field demonstration, to be led by PNNL, in the Gulf of Mexico. The material performs much better in warmer water and extraction rates in the Gulf are expected to be three to five times higher, which would improve the economics further.


Seawater contains naturally occurring uranium at a concentration of about 0.003 parts per million. Although this concentration is very low - the average abundance of uranium in the Earth's crust is about 2.7 parts per million and ore grades are many times greater than that - the oceans are estimated to contain some 4 billion tonnes of the metal. The total uranium resources in land-based ores recoverable at costs of up to USD130 per kilogram stands at around 3.7 million tonnes, so the oceans could be an important resource of uranium if it can be recovered economically.


Research groups in China and Japan are also actively studying methods to extract uranium from seawater. China National Nuclear Corporation's Beijing Research Institute of Chemical Engineering and Metallurgy in 2017 signed an agreement with Saudi Arabia's King Abdulaziz City for Science and Technology to collaborate in research on extracting uranium from seawater, with Saudi and Chinese researchers to conduct a two-year investigation.


Researched and written
by World Nuclear News



source:http://www.world-nuclear-news.org/UF-First-yellowcake-from-seawater-for-US-team-1406187.html



其他新聞
2018/7/16 10:00:56 - WANO completes reviews of Leningrad and Tianwan plants
2018/7/16 9:57:23 - Yangjiang 5 enters commercial operation
2018/7/16 9:46:00 - ‘Breakthrough’ For Bulgaria As €31M Plasma Melting Plant Begins Operations At Kozloduy Nuclear Station
2018/7/16 9:43:19 - European Court Dismisses Austria’s Objections To Hinkley Point C
2018/7/13 10:22:08 - Austrian case against Hinkley Point C aid rejected
2018/7/13 10:19:37 - UK's post-Brexit nuclear plans face scrutiny
2018/7/13 10:13:34 - 輻射監測生力軍!石門水庫、清華大學環境輻射監測站正式上線
2018/7/13 10:06:30 - 核三廠1號機預定於7月15日降載例行測試,原能會持續監控電廠運轉安全
2018/7/9 10:51:40 - Think-tanks call for states to adopt Clean Energy Standards
2018/7/9 10:49:29 - EDF maintains plant safety is a priority
2018/7/9 10:47:06 - NEI issues guidelines for regulatory interactions
2018/7/6 12:09:34 - 核二廠2號機於今(6)日降載進行例行測試,原能會持續監控電廠運轉安全(更新)
2018/7/6 12:08:15 - 核二廠2號機預定於7月7日降載例行測試,原能會持續監控電廠運轉安全
2018/7/4 10:08:53 - Boss launches Honeymoon restart strategy
2018/7/4 10:04:16 - NDA to take over management of Magnox sites
2018/7/4 9:58:23 - Japanese Cabinet approves new basic energy plan
2018/7/4 9:50:06 - 今(04)日04時10分台東縣政府北方規模4.6有感地震,各核能電廠皆正常運作,原能會持續監控電廠運轉安全
2018/7/4 9:42:18 - 核二廠1號機反應器圍阻體廠房氣體流程輻射監測器發出警戒訊號之說明
2018/7/2 10:44:58 - China's Taishan 1 reactor connected to grid
2018/7/2 10:40:05 - Bruce Power and ITM to supply cancer therapy isotope

 線上期刊目錄

 瀏覽人數
今天: 140
昨天: 122
本月: 2464
總計: 530691

30013 新竹市光復路二段101號 創新育成中心三樓309室 電話:(03)571-1808 傳真:(03)572-5461 Email: nicenter@nicenter.org.tw