Louisiana State University Professor of Research Amitava Roy has been studying the contents of ‘red mud,’ a byproduct from alumina processing, for more than a decade. Roy said on Mar. 19 that his work began out of scientific curiosity after receiving samples from bauxite tailings at Gramercy.
Red mud was once considered an environmental problem, but recent developments have shifted its perception to that of a strategic resource. This change is due in part to the discovery that red mud contains high levels of gallium, which is classified as a high-risk, high-value critical mineral by the U.S. Department of Energy and is essential for semiconductors and other technologies.
Roy’s research at LSU’s Center for Advanced Microstructures and Devices (CAMD), now being rebranded as Louisiana Light Source, uses high-intensity X-ray beamlines to analyze elements within red mud. “It was just my scientific curiosity. Many years ago, I was given some samples from the bauxite tailings at Gramercy. I wanted to see what was in them,” Roy said.
Recent industry activity has brought new attention to this field. In November, ElementUSA announced a $29.9 million federal award for a demonstration plant in Gramercy to extract gallium and scandium from Atalco’s stockpile. The following month, ElementUSA revealed plans for an $850 million commercial-scale extraction facility in Gramercy, while Atalco announced a $450 million partnership with the federal government in January to create the country’s first large-scale gallium production plant.
Although Roy is not directly involved with these companies, he believes there could be commercial opportunities stemming from his research. He noted that CAMD’s synchrotron radiation facility is one of only seven in the United States and one of two university-owned centers capable of such advanced analysis.
Roy explained that CAMD’s tools can help determine if minerals like gallium are economically recoverable: “In red mud, the loosely bound elements are often arranged in messy, disordered clusters. They are not well crystallized.” He added that standard X-ray diffraction cannot detect these disordered elements but CAMD’s X-ray absorption spectroscopy can analyze even microgram-sized samples.
Reflecting on broader implications, Roy said: “The techniques available here are very, very useful. They can be applied to any number of materials, not just red mud.” He concluded: “In every case, you need to know how they are there, what procedure you can use to extract them, and whether your process is working or not… All of these questions can be answered here at LSU.”
