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Re: Butte Priority Soils Operable Unit (BPSOU) Draft Final Insufficiently Reclaimed Sites Field Sampling Plan (FSP): BRES No. 26 – Cripple Dump
Get PDFRE: 2nd Quarter 2025 – Interim Site-Wide Surface Water Monitoring Data Report Silver Bow Creek Butte Area NPL Site, Butte Priority Soils Operable Unit Consent Decree-Civil Action No. CV 89-039-BU-SHE
Get PDFRe: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Butte Treatment Lagoons (BTL) Groundwater Treatment System Quarterly Operation and Maintenance Report – Quarter 4 2024 (dated March 28, 2025)
Get PDFRe: Comment Letter for Butte Priority Soils Operable Unit (BPSOU) Superfund Operation and Maintenance (O&M) Request for Maintenance – Kelley Stormwater Channels (dated April 22, 2025)
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Re: Butte Priority Soils Operable Unit (BPSOU) Final Insufficiently Reclaimed Sites Field Sampling and Investigation Plan (FSP): BRES No. 120 – Bonanza Dump
Get PDFRevised Draft Final Quarterly Operations and Maintenance Report Butte Treatment Lagoon System – First Quarter 2024
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Selective Leaching of Rare Earth Elements from Complex Rare Earth Ore Using Deep Eutectic Solvents
Get PDFRare earth elements (REEs) are valuable for various modern technological applications, including metallurgy, machine building, radio electronics, instrument engineering, nuclear engineering, and manufacturing. The extraction and separation of rare earth elements (REEs) from their complex ores is challenging due to their distinct physical and chemical properties, contributing to their market scarcity. At present, REE recovery utilizes traditional pyro- or hydrometallurgical processes. The overall process in the recovery and separation of individual elements from complex REE systems suffers from high energy demands and the use of many hazardous chemicals that negatively impact the environment. With the growing trend toward a circular economy aim-ing to balance sustainability, efficiency, and environmental impacts, this research is focused on using deep eutectic sol-vents (DESs): a combination of a quaternary salt: Choline Chloride and five organic acids: Oxalic Acid, Urea, and Ethylene Glycol, Lactic acid and Glycerol for the selective leaching of REEs from their complex ore which is proven to be green, selective, non-toxic, biodegradable, and cheap. The effects of different DESs and leaching time on the REE leaching efficiency were determined, and the optimum DES media were found to be Oxaline and Lactic Acid at which a leaching efficiency of 25% and 15% was achieved at 80°C respectively for cerium
L.G. Twidwell Fifty-Six Years of Research A Summary
Get PDFLarry G. Twidwell, D.Sc. is Emeritus Professor in the Department of Metallurgical and Materials Engineering at Montana Technological University. He has fifty-six years of experience in teaching and directing research in Metallurgical and Materials Engineering at Montana Tech. Twidwell and his graduate students and coworkers have conducted research emphasizing extractive metallurgy and the application of extractive metallurgical engineering to the treatment of metallurgical wastes, process waters and byproducts. Four books, seventy-seven M.Sc. theses, one-hundred-thirty refereed publications and one hundred-eight national and international presentations have resulted from their research efforts. Twidwell has received several outstanding teacher/researcher awards during his tenure at Montana Tech, e.g., TMS-EPD Distinguished Lecturer Award, 2011; TMS-EPD Best Technology Paper Award, 2006; AIME Frank Aplan Award, 2004; Montana Tech Lifetime Distinguished Researcher Award, 2002; AIME Mineral Industry National Education Award, 2001; Montana Academy of Sciences Mershon Award as Outstanding Montana Researcher, 1989; Outstanding Scholar Award, Montana Tech, 1985; and Outstanding Educator Awards, Montana Tech, 1970, 1971, 1973, 1974