Dr. Crawford Elliott and Danny Gardner, MS, find rare-earth elements source in Georgia
Magnets, lasers, fiber optics and portable X-rays are all commonplace, but their production almost always requires a class of matter known as rare-earth elements, a category that includes yttrium, scandium, gadolinium and lutetium and thirteen other elements. Despite their ubiquity in our products, the U.S. currently is reliant on international sources for these materials.
There could, however, be a time when some manufacturers can look for these resources in GSU’s Georgia backyard: New research from Dr. Crawford Elliott and Daniel Gardner, Geosciences MS 2016, found that Georgia’s rich kaolin (clay) deposits hold some of these critical elements, offering a potential and novel supply for manufacturers in several high-tech spaces.
On a macro level, the driving force behind the work is a question Dr. Elliott often addresses in his classes: Will we have the resources we need to sustain life on earth? But there was also an element of sheer curiosity. “I had been interested peripherally in the Georgia kaolins for years,” Elliott says.
What he, Gardner and their co-authors — Dr. Prakash Malla and Ed Riley, both of Georgia’s Thiele Kaolin Company, which provided the samples — were all surprised to see were high amounts of rare-earth elements in a heavy mineral subfraction, Elliott says. “In the back of my mind, I was expecting to see minerals like zircon, rutile and others. I did not expect to see the large amount of rare-earth elements.” Moreover, the heavy mineral fraction contained the hard-to-find heavy rare earth elements. “Normally the rare-earth element signals in the earth’s crust are enriched in the light rare-earth elements (La, Ce, Nd) relative to the upper continental crust,” Elliott says. “The heavy rare-earth elements (Gd-Lu, Y) were enriched in this heavy mineral subfraction relative to the amounts of rare-earth elements known in upper continental crust.”
It’s an important find, given the growing need for rare-earth elements as the world’s population demands more technology. “The REE are strategic metals,” Elliott points out. “We currently do not mine domestically the REE. The research results point to a possible resource of REE in the Georgia for the US.”
The work has led to a non-provisional patent application submitted by the GSU Research Foundation in collaboration with the Thiele Kaolin Company. Elliott is now working with current geosciences graduate and undergraduate students and colleagues with Thiele. He is contacting colleagues to build a team to find out exactly which minerals actually hold these rich rare-earth elements.