Other

Battelle Memorial Institute

Battelle Energy Alliance, LLC

University of Idaho

Lcw Supercritical Technologies Corporation

Horng-Bin Pan

Chien M Wai

Robert Vincent Fox

Bruce J Mincher

Donna L Baek

Mary Ellen Case

Li-Jung Kuo

Gary A Gill

Clive Yen

Extraction of platinum-group elements, e.g. Pd, by adsorption from acidic aqueous solutions, using chelating acrylic fibers having amidoxime substituents followed by recovery by elution with an HCl-thiourea solution. From about 10% to 100% of the acrylic fiber CN are converted to amidoxime by reaction with NHOH (hydroxylamine) in HO/MeOH solution in the range of 30&#xb0; C.-90&#xb0; C. for from 15 min to 72 hrs. The adsorptive loading of elements onto the fiber and the efficiency of elution therefrom is substantially 100%, in multiple cycles of adsorption/elution. The novel fiber/extraction process is rapid, lending it to a continuous recovery operation. A portion of the CN groups of may be converted to carboxylate groups by reaction with NaOH. Short lengths of fiber are loaded into a vertical column and the pregnant solution introduced. Upon breakthrough, the fibers may be eluted, washed and recycled hundreds of times without removal from the column.

Extraction and recovery of Pd from aqueous solutions

A metals-adsorbent PAN fiber comprising a carbon chain backbone and amidoxime, carboxylate, and nitrile pendant groups. No ester groups are present. The inventive fiber is used for removing metals, including toxic metals, from fresh water, including rivers, streams, lakes, ponds, drinking water from wells and other sources, and industrial discharge waste waters, in a pH range of 3-10, and preferably at slightly acidic conditions in the range of pH 5-6. Metals that can be removed include heavy and toxic metals, such as Sc, V, Mn, Fe, Co, Ni, Cu, Sr, Yb, Cd, Cs, Pb, La, Ce, Nd, Eu, Zn, Tb and U. The adsorbed metals can be removed from the fiber by acidic elution and recovered. The fiber can be rinsed and reused.

Extracting metals from fresh water with amidoxime-carboxylate adsorbents

A fiber comprising a carbon chain backbone and amidoxime, carboxylate, and nitrile pendant groups. The fiber may be used for removing uranium from seawater and toxic metals from drinking water.

Converting acrylic fibers to amidoxime-carboxylate containing polymer adsorbents for sequestering uranium and other elements from water

A method of recovering rare earth elements from a rare earth-containing material comprises contacting the rare earth-containing material with a solution formulated and configured to dissolve rare earth elements from the rare earth-containing material and form a solution including a plurality of rare earth elements dissolved therein. The method further includes exposing the solution including the plurality of rare earth elements dissolved therein to one of a liquefied gas or a supercritical fluid to isolate the rare earth elements from each other. Related methods of removing and purifying rare earth elements from materials and phosphor lamps are also disclosed.

Methods of recovering rare earth elements from a material

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Moscow, ID, United States of America

Horng-Bin Pan