A high performance superconducting magnetic separator is being developed for near single particle retrieval from low concentration field collected samples. Results show that maximum separation is obtained when the effective matrix element diameter approaches the diameter of the particles to be captured. Experimentally, we were able to capture very dilute levels of 0.2 to 0.8 m PuO 2 particles with dodecane as a carrier fluid. The development of new matrix materials is being pursued through the deposition of nickel dendrites on an existing stainless steel matrix material. The new materials are promising for the submicron collection of paramagnetic particles. Results indicate that these new matrices contain a high number of capture sites for the paramagnetic particles. We have also derived a force-balance model that uses empirically determined capture cross section values. The model can be used to optimize the capture cross section and thus increase the capture efficiency. This enables the prediction of high gradient magnetic separator performance for a variety of materials and applications.
Los Alamos National Lahratory, an atirmative acbowq.al owti.nliy empldyer, is oprated by lhe U.iversily.1 Cahfornia for the U.S. Department of Energy utier wnlrati W. 7405-E NG-36. By acceptance of Vds aticle, the pbhsher fecW"izes that the U .S. &vernment rel.i"s a nonexclusive, royalty-free license 1. wbllsh M r.prcd.ce the p.blishd form.1 IMS contribution, or to allow others to do so, for U.S. G.ver.men! purposes. The Los Alamo$ National LabratoV requests that the publisher ,denliv this arlicle as w.
A high-gradient magnetic separation system has been developed for capture and retrieval of ultra-low plutonium oxide concentrations. The application of advanced matrix materials and improved methodology has demonstrated the effective collection and recovery of submicron paramagnetic actinide particles with particle concentrations as low as 10 223 M. Incorporation of multiple passes during recovery of magnetically captured particles improves the system mass balance. Activity balances for plutonium
Downloaded by [Queensland University of Technology] at 14:15 13 October 2014were verified with stringent sampling protocols. Collection and recovery values demonstrate that 99% of the submicron plutonium oxide particles can be accounted for when recycle loops are incorporated into capture and recovery circuits, magnetically captured particles are released by sonication, carrier fluids are organically based, and longer matrix lengths are utilized.
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