Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1998-08-20
2000-10-17
Willis, Jr., Prince
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75717, 75718, 75720, 210757, 210761, C21B 1500, C22B 1500
Patent
active
061324914
ABSTRACT:
A method for dissociating metal-ligand complexes in a supercritical fluid by treating the metal-ligand complex with heat and/or reducing or oxidizing agents is described. Once the metal-ligand complex is dissociated, the resulting metal and/or metal oxide form fine particles of substantially uniform size. In preferred embodiments, the solvent is supercritical carbon dioxide and the ligand is a .beta.-diketone such as hexafluoroacetylacetone or dibutyldiacetate. In other preferred embodiments, the metals in the metal-ligand complex are copper, silver, gold, tungsten, titanium, tantalum, tin, or mixtures thereof. In preferred embodiments, the reducing agent is hydrogen. The method provides an efficient process for dissociating metal-ligand complexes and produces easily-collected metal particles free from hydrocarbon solvent impurities. The ligand and the supercritical fluid can be regenerated to provide an economic, efficient process.
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Hunt Fred H.
Lin Yuehe
Smart Neil G.
Wai Chien M.
Idaho Research Foundation Inc.
McGuthry-Banks Tima
Willis Jr. Prince
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