Chinese scientists discover new way to mine rare earth metals that is faster, and causes less pollution

Chinese scientists discover new way to mine rare earth metals that is faster, and causes less pollution

China has one-third of the world's rare earths reserves and accounts for 90 per cent of the global supply

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Rare earths are essential for the manufacture of hi-tech products, but their refinement is massively polluting.
Photo: Reuters

A team of Chinese scientists has developed a new process they say significantly reduces the time needed to extract rare earths from ore, and it could also cut industry pollution. Extracting the trace metal elements is difficult and takes days to complete, but researchers at the Chinese Academy of Sciences in Fuzhou say they have found a way to shorten the process to minutes.

According to Sun Xiaoqi, lead scientist on the project, it was an important development. “This could start a technological evolution in the rare earths industry,” Sun said.  China has about one-third of the world’s rare earths reserves and accounts for 90 per cent of the global supply, according to the US Geological Survey. The 17 trace metal elements are critical to the manufacture of nearly all hi-tech products, from semiconductors to smartphones and stealth fighter jets.

Sun said the standard way to extract rare earths from ore involves submerging them in a solution of toxic chemicals to separate out the useful elements, a process that can take up to a week. But using a new material developed by Sun’s team, they can be separated out with unprecedented speed and efficiency, he added.

Seen under a microscope, the material – a mix of alkyl phenoxy carboxylic acids – contains countless solid particles just a few micrometres wide. When the material is mixed with the fine grains of rare earths ore, it starts a process known as “extraction and precipitation strategy”.

According to Sun, extraction can be completed in 20 minutes. Also, the material can be used to extract rare earths from mining debris, and trace amounts of the metals can even be obtained from leached waste.

“[Finding a] low-cost and clean production process for rare earths is a worldwide problem,” Sun said. “Traditional extraction requires a large amount of volatile organic solvents … which are difficult to recycle, and the waste water they produce has a negative impact on the environment.”

Sun said the new extraction method would reduce production costs as well as pollution. The industry is known for its heavy environmental cost. Pollutants in waste water are difficult and expensive to safely dispose of, but he claimed the new material could be recycled and the process would easily meet environmental standards.

There are also challenges, including producing the extraction material on a large scale and modifying existing equipment at rare earths refineries, but Sun said they had government backing.

“We’re taking this extraction process to the mass application stage,” he said. Industrial testing has already been completed together with some of the world’s largest rare earths producers, including Ganzhou Rare Earth Group in Jiangxi province and Baotou Steel Hefa Rare Earth in Inner Mongolia.


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3 Comments

Markonys Sophie

08:07am

UniSport Australia has announced the teams for the Emerging Opals and Emerging Boomers ahead of the 2019 Summer Universiade to be held in Naples, Italy from July 3-14.

Also known as the World University Games, the tournament is the largest multi-sport event apart from the Olympic Games and features almost 10,000 athletes who are currently completing university studies competing across 18 disciplines.

https://livesportworld.com/summer-universiade-2019-schedule/
The Emerging Opals welcome back Abigail Wehrung, Alex Sharp, Keely Froling and Lauren Scherf who will aim to defend their gold medal winning feats from two years ago in Taipei.Australia has announced the teams for the Emerging Opals and Emerging Boomers ahead of the 2019 Summer Universiade to be held in Naples, Italy from July 3-14.
https://livesportworld.com/world-university-games-live-stream

That success follows on from a previous gold medal in 2007 as well as bronze medals in 2005, 2009, 2011 and 2013.

https://allevents.in/naples/live-summer-universiade-2019-live-stream/800...

Seo Ratdp

14:09pm

Sun said the new extraction method would reduce production costs as well as pollution. The industry is known for its heavy environmental cost. Pollutants in waste water are difficult and expensive to safely dispose of, but he claimed the new material could be recycled and the process would easily meet environmental standards.

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