Archives par mot-clé : Technology

New technology promises to be game-changer in the extraction of rare earths

by V.L. Leotaud, May 10, 2020 in MiningCom


Researchers at Purdue University in the US have developed a new technology that promises to be a game-changer in the extraction of rare earths.

THE GLOBAL MARKET OF RARE EARTH METALS HAS BEEN VALUED AT $4 BILLION PER YEAR BUT 70% OF THE PRODUCTION IS CONCENTRATED IN CHINA

In a paper published in the journal Green Chemistry, the scientists explain that the patented extraction and purifying processes use ligand-assisted chromatography and are shown to remove and purify rare earth metals from coal ash, recycled magnets and raw ore safely, efficiently and with virtually no detrimental environmental impact.

This is key because, at present, many companies across the world don’t even dare to consider extracting REE due to the damages caused to the environment by acid-based separation and purification of these elements.

“About 60% of rare earth metals are used in magnets that are needed in almost everyone’s daily lives. These metals are used in electronics, aeroplanes, hybrid cars and even windmills,” Nien-Hwa Linda Wang, whose lab developed the technology, said in a media statement. “We currently have one dominant foreign source for these metals and if the supply were to be limited for any reason, it would be devastating to people’s lives. It’s not that the resource isn’t available in the US, but that we need a better, cleaner way to process these rare earth metals.”

Neodymium magnets. (Image by Nevit Dilmen, Wikimedia Commons).

See also Two-zone ligand-assisted displacement chromatography for producing high-purity praseodymium, neodymium, and dysprosium with high yield and high productivity from crude mixtures derived from waste magnets (here)

Negative CO2 Emissions

by Kevin Kilty, January 24, 2020 in WUWT


An article in the January 2020 Issue of Physics Today (1) presents an interesting and very readable overview of methods to capture and store away CO2 emissions. The purpose of this guest blog is to summarize a few key points the paper makes, and add some commentary. WUWT has covered some of this same territory recently here and here.

Motivation

Of course, the motivation for negative emissions technologies (NETs), or CO2 capture, is to bring atmospheric CO2 back to safe levels. Although the article fails to mention what safe means in this context, and what levels are unsafe, it alludes to melting polar ice and methane escaping from melting permafrost as consequences of unsafe climate. Nothing unusual here. Despite relegating its case for an unsafe future to such enterprises as the IPCC, the article does provide some insight into the cause of what seems to be the current “crisis” mentality. It is 1.5°C temperature rise goal of the 2015 Paris agreement. As readers of WUWT already know, this is not a 1.5°C increase from now, but rather from an estimated pre-industrial level — meaning that two-thirds of that margin is already gone and we have but 0.5°C left to work with. I suspect most people do not understand this subtle point.

Eventually the article makes a brief excursion into more phenomena by which climate change would become unsafe — forest fires, droughts, and sea level rise. All of this is also familiar to WUWT readers.


Technologies Involved